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  • 1. Eriksson, Kjell
    A domain independent integral expression for the crack extension force of a curved crack in three dimensions2002In: Journal of the mechanics and physics of solids, ISSN 0022-5096, E-ISSN 1873-4782, Vol. 50, no 2, p. 381-403Article in journal (Refereed)
    Abstract [en]

    An integral expression that is domain independent in curvilinear coordinates and compatible with zero divergence of Eshelby's (Phil. Trans. Roy. Soc. (London) 244 (1951) 87.) energy momentum tensor was obtained from the principle of virtual work. By applying Eshelby's definition of the force on a material defect a general expression of the crack extension force for a curved crack in three dimensions, here called the F-integral, was derived from the domain independent integral expression. The F-integral is given explicitly for a number of curved cracks and found to be in agreement with previously known solutions, when available. The influence of crack surface and crack front curvature upon the various forms of the F-integral is discussed. The F-integral presented in this work is a generalisation of the J-integral (Rice, J. Appl. Mech. 35 (1968) 379.) to curved cracks in orthogonal curvilinear coordinates

  • 2. Eriksson, Kjell
    A fracture mechanics assessment method for older structural steels1994In: Structural integrity - experiments, models, applications: proceedings of the 10th Biennial European Conference on Fracture - ECF 10 - held in Berlin, Federal Republic of Germany, 20 - 23 September 1994 / [ed] Karl-Heinz Schwalbe; C. Berger, West Midlands, U.K: EMAS , 1994, p. 561-570Conference paper (Refereed)
    Abstract [en]

    A method for calculation of fracture toughness requirements for ordinary structural steel is described. The method is based on typical loading cases and takes distributed load and fracture toughness into account while the size of an assumed crack is kept deterministic. Transferability has been studied by means of full scale testing of structural elements and laboratory specimens extracted from these. Particularly for older and inhomogeneous steels transferability is obtained under similar constraint and for full thickness laboratory specimens. Examples of toughness as a function of required safety are given.

  • 3. Eriksson, Kjell
    A general expression for an area integral of a point-wise J for a curved crack front2000In: International Journal of Fracture, ISSN 0376-9429, E-ISSN 1573-2673, Vol. 106, no 1, p. 65-80Article in journal (Refereed)
    Abstract [en]

    The expression for the J-integral at a point on a three-dimensional crack front, obtained from a surface independent integral, is in general a sum of a contour integral and an area integral. In this work a general expression of an area integral for a crack with a curved front is derived in curvilinear coordinates. In certain situations the area integral vanishes and previously known cases are a straight crack front in plane stress or plane strain. The general conditions for a vanishing area integral are studied. It is shown that the area integral is non-zero for cracks with a curved front in the direction of crack extension. Some examples of curved cracks are given, for which the area integral vanishes and that are of interest in practice.

  • 4.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    A modified three point bend specimen2009In: Proceedings: nternationale sur la Rupture : Ottawa, Canada, July 12 - 17, 2009 = Comptes rendus, National Resources Canada , 2009, p. 184-192Conference paper (Refereed)
    Abstract [en]

    Steel profiles with slightly tapered cross section sides are not uncommon in older structures. The steels are often inhomogeneous and the fracture toughness varies across the thickness. In this project, the geometry of the standard three point bend specimen (ASTM E-1820) is modified to allow full thickness testing of tapered samples. The part of the project reported here deals with the J-integral of the modified specimen. The J-integral is calculated analytically and numerically with the finite element method for a linear and a non-linear material model and different specimen cross section proportions. A simple, single test fracture toughness evaluation procedure is proposed.

  • 5.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    A modified three point bend specimen2008In: Multilevel Approch to Fracture of Materials, Components and Structures: 17th European Conference on Fracture / [ed] Jaroslav Plokluda; Petr Lukás; Pavel Sandera; Ivo Dlouhý, Brno: VUTIUM , 2008, Vol. 2, p. 1932-1939Conference paper (Refereed)
    Abstract [en]

    Steel profiles, such as angle sections in beams and girders, with slightly tapered cross section sides are not uncommon in older structures. Further, the fracture toughness of older and inhomogeneous steels varies in general across the thickness of a sample. The thickness of a machined, standard parallel-sided specimen of a tapered sample is in practice seldom more than 60-70 % of the full sample thickness and such a specimen captures in general inferior core material only. In view of this conundrum, a modified three point bend specimen with partly tapered sides has been designed so as to accommodate tapered samples. The project includes calibration, testing and evaluation of the modified specimen. The part of the project, which is reported here, is part analytical and part numerical and aimed at calculation of the stress intensity factor for various crack lengths, taper and specimen cross section proportions.

  • 6.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    A modified three point bend specimen2007In: Experimental analysis of nano and engineering materials and structures: proceedings of the 13th international conference on experimental mechanics, Alexandroupolis, Greece, July 1-6, 2007 / [ed] Emmanuel E Gdoutos, Dordrecht: Encyclopedia of Global Archaeology/Springer Verlag, 2007Conference paper (Refereed)
    Abstract [en]

    Certain types of structural elements, like riveted or rolled beams and girders, etc., of older steels, often have tapered flanges and the steels themselves are as a rule mor or less inhomogeneous. The fracture toughness at in-plane loading of related structural details, has been observed to vary significantly in the thickness direction and generally increases outwardly from the mid-section part. The most common fracture toughness test specimen used for testing of samples taken from oldes steel structures, in e.g. assessment work, is the three point bend specimen. This specimen, like all standard specimen types, is plane-parallel and if machined from a tapered part it will not necessarily yield a fair estimate of the effective fracture toughness for a through crack in situations where fracture toughness varies across the thickness. In view of this, a modified three point bend specimen with partly tapered sides has been designed so as to accomodate samples with this feature. The project includes calibration , testing and evalutation of the modified specimen. The firt part of the project, which is reported here, is mainly analytical and is aimed at obtaining a first and rough estimate of the order of influence the modified geometry upon crack tip parameters.

  • 7. Eriksson, Kjell
    A note on the derivation of the J-integral from potential energy2004In: International Journal of Fracture, ISSN 0376-9429, E-ISSN 1573-2673, Vol. 130, no 4, p. L201-L203Article in journal (Other academic)
    Abstract [en]

    In a recent work Z.-H. Jin and C. T. Sun (2004) presented a derivation of the J-integral from the potential energy of a system, which is thought to circumvent previous cumbersome or flawed derivations. Two items in this work call for discussion; one is related to the effect of a singularity upon different types of contour integrals and the other to the strain energy difference term.

  • 8.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    A revisit to the bending problem of a thin elliptic aelotropic plate with simply supported edge and uniform lateral load2007In: Zeitschrift für Angewandte Mathematik und Physik, ISSN 0044-2275, E-ISSN 1420-9039, Vol. 58, no 2, p. 318-329Article in journal (Refereed)
    Abstract [en]

    The complex solution method of Okubo for the deflection of a thin circular aelotropic plate with simply supported edge and uniform lateral load was extended to an elliptic plate by Ohasi. In his work however several inconsistencies appear, of which at least one disqualifies a central part. From a revisit to the works of Okubo and Ohasi a new solution for the deflection of a thin elliptic aelotropic plate with simply supported edge and uniform lateral load emerged. The solution is a generalisation of Okubo's solution and is valid for any angle between material and geometric principal axes. Previously known solutions, including those for circular plates, are reproduced as special cases of the new solution and results of numerical calculations in new situations appear reasonable.

  • 9.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    A three-point bend specimen with partly tapered cross-section sides2010In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 77, no 10, p. 1537-1551Article in journal (Refereed)
    Abstract [en]

    The stress intensity factor and the J-integral have been derived analytically and numerically for a modified three-point bend specimen with partly tapered sides, for various crack lengths, taper and specimen cross-section proportions, in order to allow full-thickness testing of tapered samples, common in older steel structures, to obtain a fair effective fracture toughness value for a through thickness crack in inhomogeneous materials. The stress intensity factor is obtained with the approximate analytical method of Kienzler and Herrmann, based on the concept of material forces. The J-integral is calculated numerically with a 3D finite element model for a linear elastic material and an elastic ideal-plastic material. A simple single specimen fracture toughness evaluation procedure is proposed. It is found that the effect of taper in the range encountered in practice is small, of the order of a few percent.

  • 10.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    An overview of older structural steel and their properties2011In: International Workshop Strengthening of Steel Bridges: Topics of relevance for the BRIFAG project / [ed] Peter Collin; Mattias Nilsson; Milan Veljkovic, Luleå: Luleå tekniska universitet, 2011Conference paper (Refereed)
  • 11.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Att konstruera med stål : läromedel för konstruktörer: Modul 8, Utmattning2006Other (Other (popular science, discussion, etc.))
  • 12.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Att konstruera med stål : läromedel för konstruktörer: Modul 9, Brottmekanik2006Other (Other (popular science, discussion, etc.))
  • 13. Eriksson, Kjell
    Crack extension force of a curved crack derived from the principle of virtual work2000In: International Journal of Fracture, ISSN 0376-9429, E-ISSN 1573-2673, Vol. 102, no 1, p. 15-20Article in journal (Refereed)
    Abstract [en]

    A general method to determine the crack extension force F related to a finite segment of a curved crack is presented. A path independent integral expression that holds in curvilinear coordinates is derived from the principle of virtual work. An appropriate virtual displacement field allows variation of the position of a crack tip. F is related to the path independent integral expression through variation of a total energy expression. To illustrate the applicability of the method F is derived for the conical crack in axisymmetric loading. For a plane crack with a straight front F is identical to the J-integral, Rice (1968).

  • 14.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Decomposition of Eshelby's energy momentum tensor and application to path and domain independent integrals for the crack extension force of a plane circular crack in Mode III loadiing2007In: International Journal of Fracture, ISSN 0376-9429, E-ISSN 1573-2673, Vol. 144, no 1-2, p. 215-225Article in journal (Refereed)
    Abstract [en]

    Vanishing divergence of Eshelby's energy momentum tensor allows formulation of path or domain independent integral expresssions of the crack extension force. In this work, a decomposition scheme of this tensor is presented, which results in zero divergence decomposed parts that allow formulation of expressions yielding the Mode I, II and III crack tip parameters J and K, with particular emphasis on Mode III, at present. By using the Mode III decomposed part of Eshelby's tensor and the virtual crack extension method, a path and a domain independent integral, both new, for the crack extension force of a plane cirular crack in axi-symmetric Mode III loading, are derived as examples of applicatioin.

  • 15. Eriksson, Kjell
    Effects of weld discontinuities on the fatigue properties of high strength steel1993In: Materials testing: [selection of papers pres. at the 10th Congress on Material Testing, Budapest, 7 - 11 October 1991], Elsevier, 1993Conference paper (Refereed)
  • 16. Eriksson, Kjell
    Energy release rates for the penny-shaped crack in a linear piezoelectric solid2002In: International Journal of Fracture, ISSN 0376-9429, E-ISSN 1573-2673, Vol. 116, no 2, p. L23-L28Article in journal (Other academic)
    Abstract [en]

    A domain independent integral expression that is derived from the principle of virtual work and holds in curvilinear coordinates is used to derive the energy release rate for a penny-shaped crack in a linear piezoelectric solid. The virtual mechanical and electric displacement fields are chosen to allow variation of the crack tip position. Results for the energy release rate for a finite crack segment and point-wise show the effect of crack front curvature in a piezoelectric material.

  • 17. Eriksson, Kjell
    Fatigue life assessment of service damaged and corroded members of structural steel1992In: Fatigue design 1992: Helsinki, Finland, 19-22 May, 1992 / [ed] Jussi Solin, Espoo: Valtion teknillinen tutkimuskeskus. Tie- ja liikennelaboratorio , 1992, p. 215-227Conference paper (Refereed)
    Abstract [en]

    method for estimating the residual fatigue life of service damaged and corroded structural members are developed. Scratch and hit marks, misplaced or empty holes that are exposed to corrosion are considered. The method is based on Palmgren-Miner's damage accumulation rule and field registered stress collectives. Standard methods are used to take effects of stress concentration and corrosion into account. If stress concentration and corrosion combine as is usually assumed, then corroded scratch marks may affect residual life

  • 18.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Materialteknisk provning av konstruktionsstål från järnvägsbro över Åby älv2014Report (Other academic)
    Abstract [sv]

    Brottmekanisk provning, dragprovning och slagprovning av konstruktionsstål från undre ramstång i huvudfackverk, från långbalk och från tvärbalk i den nedmonterade järnvägsbron över Åby älv, uppförd 1951.

  • 19. Eriksson, Kjell
    On the correlation between Charpy notch toughness and fracture toughness of base and weld metal1992In: Mechanical effects of welding: IUTAM symposium, Lulea, Sweden, June 10 - 14, 1991 / [ed] Lennart Karlsson, Berlin: Encyclopedia of Global Archaeology/Springer Verlag, 1992, p. 175-180Conference paper (Refereed)
    Abstract [en]

    A compilation of data from very different sources shows that correlation between notch toughness and fracture toughness cannot be universal. It is shown that common empirical relationships grossly underestimate fracture toughness of inhomogeneous base material and, worse, that toughness requirements on weld metal in terms of notch toughness do not necessarily guarantee the desired safety against fracture

  • 20. Eriksson, Kjell
    On the crack extension force of curved cracks2001In: Advances in fracture research: ICF : 10th international conference on fracture, Honolulu / [ed] K. Ravi-Chandar; T. Kishi; R.O. Ritchie; A.T. Yokobori Jr; T. Yokobori (Sr), Amsterdam: Elsevier, 2001Conference paper (Refereed)
    Abstract [en]

    A domain independent integral is obtained from the principle of virtual work. A suitable choice of the virtual displacement field allows variation of the position of a crack tip. For materials possessing a strain energy function Eshelby's definition of the force on a point defect is used to obtain the crack extensioin force. The method is general and allows treatment of a crack whose surfaces and front are curved by unsing curvilinear coordinates. To illustrate the applicability of the method three examples of the point-wise crack extension force are given, with different combinations of crack surface and crack front curvature. A general expression of the crack extension force for curved cracks is suggested. In Cartesian coordinates the proposed expression reduces to the J-integral of Rice.

  • 21. Eriksson, Kjell
    On the effect of corrosion and stress concentration upon fatigue life of steel structures1995In: Nordic Steel Construction Conference '95: proceedings : [new materials, new codes, new applications] : Malmö, Sweden, June 19-21, 1995, Stockholm: Stålbyggnadsinstitutet , 1995, p. 123-129Conference paper (Refereed)
    Abstract [en]

    The effect of corrosion and stress concentration on the fatigue life of older structural steel is studied for a typical loading history and some types of damage encountered in practice. The structural steel specimen represents a railway beam that is severely corroded during the 80 years of service. Standard uniaxial tension testing at ambient temperature and notch toughness testing at -20 deg C are carried out. It is found that the residual life is, in general, reduced both by mechanical damage and corrosion. The combined effect may be reduce the residual life significantly.

  • 22.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    On the point-wise J-value of axisymmetric plane cracks1998In: International Journal of Fracture, ISSN 0376-9429, E-ISSN 1573-2673, Vol. 91, no 3, p. L31-L36Article in journal (Other academic)
    Abstract [en]

    A point-wise value of the J-integral for a radially expanding plane axisymmetric crack, which is path independent an yields the energy release rate, has been derived from Eshelby's energy momentum tensor taken in cylindrical coordinates. In particular the area integral in the expression for J by Carpenter et al. has not been found to be zero, as recently advanced by Jonsson and Nilsson, but in agreement with results of others, e.g. Bergkvist and Lan Huong

  • 23. Eriksson, Kjell
    The deformation and fracture of an HEB400 beam1993In: Materials testing: selection of papers pres. at the 10th Congress on Material Testing, Budapest, 7 - 11 October 1991 / [ed] E. Czoboly, Elsevier, 1993Conference paper (Refereed)
  • 24. Eriksson, Kjell
    The effective fracture toughness of structural components obtained with the blend rule1998In: Nuclear Engineering and Design, ISSN 0029-5493, E-ISSN 1872-759X, Vol. 182, no 2, p. 123-129Article in journal (Refereed)
    Abstract [en]

    The blend rule for the effective fracture toughness of a layered material was originally derived from the special case of a through crack in a globally elastic material and later extended to accomodate non-linear behaviour. It is now derived from a general case by considering material elements of finite size and of different toughness along and around the tip of a crack. Experimental results obtained with an inhomogeneous ordinary structural steel which support the blend rule are presented. It is shown that the effective fracture toughness governs the load-bearing capacity of a cracked full-scale structure. Some further results found in the literature for the heat-affected zone material of a high-strength microalloyed quenched and tempered structural steel and computational results for a structural steel typical of a nuclear pressure vessel are shown to support the blend rule.

  • 25.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    The support reaction of a simply supported and uniformly loaded thin circular aeolotropic plate2008In: Journal of applied mechanics, ISSN 0021-8936, E-ISSN 1528-9036, Vol. 75, no 2, p. 10021-10028Article in journal (Refereed)
    Abstract [en]

    A previous analytical solution of the deflection of a thin circular aeolotropic plate, with simply supported edge and uniform lateral load, has been used to derive approximate series expressions for the plate support reaction, which are directly applicable in practice. The support reaction, which has been calculated for some typical anisotropic materials of varying degree of anisotropy, varies significantly along the plate perimeter and strongly anisotropic materials require in general a higher order series solution. Certain solution constants of previous deflection approximations were not found to harmonize and are therefore recalculated.

  • 26. Eriksson, Kjell
    Toughness requirements for older structural steels1990In: Remaining fatigue life of steel structures: IABSE Workshop / International Association for Bridge and Structural Engineering, Zürich: International Association for Bridge and Structural Engineering, 1990Conference paper (Refereed)
  • 27. Eriksson, Kjell
    et al.
    Atkins, A.G.
    The effective through crack fracture toughness of structural components of older inhomogeneous steels1995In: Materials ageing and component life extension: proceedings of an International Symposium on Materials Ageing and Component Life Extension, held in Milan, Italy, 10 - 13 October 1995 / [ed] V. Bicego, Warley: EMAS , 1995, p. 147-154Conference paper (Refereed)
    Abstract [en]

    Older, ordinary structural steel sections are often inhomogeneous in their microstructure, having a low-toughness "core" material and a higher toughness surface material. The overall behaviour of such structural components has been found to be more ductile than predicted by "weakest-link" arguments. This behaviour is analysed by extending the theory of the globally elastic fracture of layered sandwich materials to accommodate non-linear behaviour and mixed toughness. The extended theory has been applied to the behaviour of full scale beams typical for bridges.

  • 28. Eriksson, Kjell
    et al.
    Nilsson, F.
    Öberg, H.
    The deformation and failure of cracked broad flange beams of ordinary structural steel in bending1993In: Shallow crack fracture mechanics, toughness tests and applications: international conference, Cambridge, UK, 23-24 September 1992 / [ed] Michael G. Dawes, Cambridge: Bentham Press , 1993Conference paper (Refereed)
  • 29. Eriksson, Kjell
    et al.
    Öberg, H.
    The formation and failure at -30 deg C of cracked broad flange beams of ordinary structural steel in bending1993In: Shallow crack fracture mechanics, toughness tests and applications: conference : Cambridge, UK, 23-24 September 1992 / [ed] Michael G. Dawes, Cambridge: Bentham Press , 1993, p. 10/1-10/9Conference paper (Refereed)
    Abstract [en]

    The deformation and failure in bending of precracked broad flange beams of type HEB 400 and similar was studied. Six m long beam elemments were slowly loaded to fracture or plastic deformation at the testing temperature -30 deg C. The J contour integral for the full scale beam element was calculated with the finite element method for two typical crack lengths. J as a function length was approximated with the R6-method using analytical estimates of the fully plastic bending moment for thin-walled beam cross-sections. Critical values of J and CTOD were obtained with standard compact and SENB specimens machined from the beam flanges. Although scatter is considerable the fracture toughness ranges of the laboratory specimens and of the full scale tests are very much in coincidence. By means of a residual strength diagram the borderline between long and short cracks is illustrated. Here long cracks are those which caused fracture and short cracks just plastic deformation but no crack growth.

  • 30.
    Hellström, Lisbeth M.
    et al.
    Mid Sweden University, Fibre Science and Communication Network, FSCN, Department of Natural Science.
    Isaksson, Per
    Mid Sweden University, Fibre Science and Communication Network, FSCN, Department of Natural Science.
    Gradin, Per A.
    Mid Sweden University, Fibre Science and Communication Network, FSCN, Department of Natural Science.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    An analytical and numerical study of some aspects of the wood chipping process2009In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 24, no 2, p. 225-230Article in journal (Refereed)
    Abstract [en]

    In order to model the wood chipping process, the primary process parameters have been identified and their first order interaction studied. The model is analytical and incorporates, in particular, the influence of sliding friction between the wood chipping tool and the log. To estimate the accuracy of the analytical model, a Finite Element (FE) analysis of the problem considered was also performed. The analytical model and the FE analysis are both restricted to small deformations and linear elastic orthotropic material behaviour. The most severe limitation with both the analytical and the FE model is the assumption of linearly elastic material. On the other hand it is felt that existing models of anisotropic plasticity in metals are lacking too much of physical relevance, if applied to wood. The analytical model predicts the normal and shear strain distribution in the crack-plane prior to crack initiation. The analytical distributions are in reasonable agreement with the corresponding distribution of the FE analysis. Based on experimental findings, it is suggested that the stress field over the entire crack-plane, in conjunction with the stress field close to the tip of the chipping tool, are critical for chip creation, rather than just the latter.

  • 31. Lorentzon, M.
    et al.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    A path independent integral for the crack extension force of the circular arc crack2000In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 66, no 5, p. 423-429Article in journal (Refereed)
    Abstract [en]

    A path independent integral expression for the crack extension force of a two-dimensional circular arc crack is presented. The integral expression, which consists of a contour and an area integral, is derived from the principle of virtual work. It is implemented into a FEM post-processing program and the crack extension force is calculated for a circular are crack in a linear elastic material. Comparison with exact solutions by Cotterell and Rice for the effective elastic stress intensity factor shows acceptable accuracy for the numerical procedure used

  • 32.
    Lorentzon, M.
    et al.
    Luleå tekniska universitet.
    Eriksson, Kjell
    Influence of intermediate loading rates and temperature on the fracture toughness of ordinary carbon-manganese structural steels1998In: Fatigue & Fracture of Engineering Materials & Structures, ISSN 8756-758X, E-ISSN 1460-2695, Vol. 21, no 7, p. 805-817Article in journal (Refereed)
    Abstract [en]

    Three-point bend and compact tension specimens, taken from beam sections of modern and older ordinary C-Mn structural steels, were tested at intermediate loading rates at room temperature and -30°C. The experimental work, except the loading rates used, was performed according to ASTM E-813. In order to investigate transferability of data, full-scale beam sections were also tested at intermediate loading rates. The fracture toughness of C-Mn structural steels depends strongly on the loading rate, and decreases rapidly with increasing loading rate at and just above the maximum prescribed in ASTM E-813. Fracture toughness data for structures exposed to intermediate loading rates indicate the requirement for testing at appropriate loading rates. The behaviour of full-scale structural elements subjected to intermediate loading rates can, provided certain conditions are fulfilled, be predicted from data obtained from small laboratory specimens

  • 33. Lorentzon, M.
    et al.
    Eriksson, Kjell
    Influence of quasi-static loading rate and temperature on the fracture toughness of older structural steels1995In: IABSE Symposium, San Francisco 1995: Extending the lifespan of structures, Zürich: International Association for Bridge and Structural Engineering, 1995Conference paper (Refereed)
  • 34. Lorentzon, M.
    et al.
    Eriksson, Kjell
    On the effect of quasi-static loading rates upon the fracture toughness of ordinary structural steels1996In: Mechanisms and mechanics of damage and failure: proceedings of the 11th Biennial European Conference on Fracture - ECF 11 - held in Poitiers-Futuroscope, France, 3 - 6 September 1996 / [ed] J. Petit, EMAS , 1996, Vol. Vol. 1, p. 443-Conference paper (Refereed)
    Abstract [en]

    For a cracked structural component the crack tip loading rate very often exceeds the maximum rate prescribed in current fracture toughness standards, e.g., ASTM E813. In a previous work, Lorentzon and Eriksson, it was found that loading rates at and just above the ASTM limit significantly affect the fracture toughness of ordinary structural steels. The effect of the loading rate upon the stress and strain distribution around a mode I plane strain crack tip has been calculated with the finite element method. A boundary layer formulation based upon Westergaard's exact analytical solution for an infinite plate and a Perzyna visco-plastic material model has been used. The results show that viscous effects are significant only very close to the crack tip.

  • 35. Lorentzon, M.
    et al.
    Eriksson, Kjell
    Some fracture mechanics aspects of welded high sterngth low alloy steels in seismic-design1998In: Long span and high rise structures IABSE symposium Kobe 1998, [September 2-4], 1998, Zürich: International Association for Bridge and Structural Engineering, 1998Conference paper (Refereed)
  • 36.
    Nilsson, Mattias
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    James, Gerard
    Projektengagemang i Stockholm AB.
    The instrumentation and monitoring of the Vårby Bridge2010In: Large structures and infrastructures for environmentally constrained and urbanised areas: IABSE symposium, Venice 2010 ; [34th International Symposium on Bridge and Structural Engineering, Venice, Italy, September 22 - 24, 2010] / [ed] Anton Steffen, International Association for Bridge and Structural Engineering, 2010Conference paper (Refereed)
    Abstract [en]

    Numerous cracks have been discovered in the Vårby Bridge near Stockholm, Sweden. All cracks are found at the junctions between cross girders and the main girders, more specifically, at the welds connecting the vertical web stiffeners to the top flanges of the main girders. In order to identify the reason for the observed cracks, an ongoing investigation under the commision of the bridge owner was started in the spring of 2009. One conclusions so far is that the observed cracks are to 100 % certainty a result of fatigue.FEM-modeling is currently going on as a part of a master thesis. As the fatigue process is distortional the propagation phase of the observed cracks might slow down or even stop. One task will thus be to determine the stress intensity factor versus crack length relationship in order to model a growing crack. Suggestions of possible of methods of refurbishment, based upon the results, will then be presented to the bridge owner.

  • 37.
    Nilsson, Mattias
    et al.
    Ramböll Sverige, Ramböll Sverige AB, Luleå.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    James, Gerard
    Royal Institute of Technology, Projektengagemang i Stockholm AB.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    The Instrumentation and monitoring of the Varby Bridge2010In: Large structures and infrastructures for environmentally constrained and urbanised areas: IABSE symposium, Venice 2010 ; [34th International Symposium on Bridge and Structural Engineering, Venice, Italy, September 22 - 24, 2010] / [ed] Anton Steffen, Zürich: International Association for Bridge and Structural Engineering, 2010, p. 300-301Conference paper (Refereed)
    Abstract [en]

    Numerous cracks have been discovered in the Varby Bridge near Stockholm, Sweden. All cracks are found at the junctions between the cross girders and the main girders, more specifically, at the welds connecting the vertical web stiffeners to the top flanges of the main girders. The cracks might possibly be causing serious problems if they are allowed to propagate through the entire length of the weld, thereby permitting out-of-plane bending of the main girder web. In order to identify the reason for the observed cracks, an ongoing investigation under the commision of the bridge owner was started in the spring of 2009. One conclusion so far, is that the observed cracks conclusively are a result of fatigue As a part of a master thesis, FEM-modelling is currently under way. As the fatigue process is distortional, the propagation phase of the observed cracks might slow down or even stop. One task will be to determine the stress intensity factor versus crack length relationship in order to model a growing crack. The final chosen method of refurbishment will be based upon the results of the study and will be implemented in cooperation with the bridge owner

  • 38.
    Nilsson, Mattias
    et al.
    Ramböll Sverige.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    James, Gerard
    Projektengagemang AB.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    The Instrumentation and monitoring of the Vårby Bridge2011In: International Workshop Strengthening of Steel Bridges: Topics of relevance for the BRIFAG project / [ed] Peter Collin; Mattias Nilsson; Milan Veljkovic, Luleå: Luleå tekniska universitet, 2011Conference paper (Refereed)
  • 39.
    Noury, Pourya
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Determination of stress intensity factors for cracked bridge roller bearings using finite element analyses2017In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 169, p. 67-73Article in journal (Refereed)
    Abstract [en]

    In this work, the finite element method is employed to gain an understanding of the behaviour of a cracked bridge roller bearing in service. The cracked roller is considered as an edge-cracked disk (two-dimensional plane strain system) subjected to a radial compressive line load. The crack parameters KI and KII are calculated for the relevant load configuration and angle of disk rotation. The calculated data are also used to check the accuracy of approximate SIF solutions reported earlier [1] and [2]. For plain Mode I loading very good agreement is found between the obtained results and data presented in Schindler and Morf (1994). 

  • 40.
    Noury, Pourya
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Failure analysis of martensitic stainless steel bridge roller bearings2017In: Engineering Failure Analysis, ISSN 1350-6307, E-ISSN 1873-1961, Vol. 79, p. 1017-1030Article in journal (Refereed)
    Abstract [en]

    The paper is aimed at finding the likely failure mechanism of a bridge roller bearing made of high strength martensitic stainless steel. Spectroscopy and finite element stress analysis of the roller indicated that an initial radial surface crack, found at an end face of the roller and close to the contact region, was induced by stress corrosion cracking (SCC). The initial crack subsequently changed shape and increased in size under growth through fatigue and finally formed a quarter-circle radial crack centred on the end face corner of the roller. Numerically computed stress intensity factors for the final crack showed that crack loading was predominantly in Mode II. For a crack size as observed on the fracture surface, the maximum service load, as specified by the manufacturer, enhanced by a certain roller bearing misalignment effect, was sufficient for failure through fracture.

  • 41.
    Noury, Pourya
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Failures of high strength stainless steel bridge roller bearings: A review2017In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 180, p. 315-329Article in journal (Refereed)
    Abstract [en]

    With the innovation of elastomeric bearings in the mid-1950s steel bearings lost their interest and significance both in research and development and subsequently even in application. Steel bearings were gradually abandoned in bridges, followed by the technical literature and design standards. However, a great number of steel bearings remain today in service world-wide and will pose their particular challenges in the future. To the author’s knowledge, just in Sweden, high strength stainless steel bearings still exist in no less than some 650 bridges. In recent years, a large number of such bearings have failed with an alarmingly high frequency in Sweden during a period of six to twenty years after installation making them a serious maintenance cost issue.

    After a brief summary of the history of high strength stainless steel bearings, the paper reviews service experience of such bearings in Sweden and elsewhere. Accompanying finite element analyses were performed in order to gain insight into the likely failure mechanism. Finally, this comprehensive review leads to a conclusion that identifies the causes of the failures occurred and makes some recommendations.

    Although previous investigations of the stainless steel bearings have not been able to clearly identify the cause(s) of the failures occurred, it is found that the failures primarily occurred due to initiation of cracks through stress corrosion cracking followed by fatigue crack growth requiring a certain stress range and a sufficiently large number of cycles until final failure ensued through sudden and instable fracture after fatigue growth to a critical crack size.

  • 42.
    Pétursson, Hans
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Eriksson, Kjell
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Low-cycle fatigue of steel piles2010In: Large structures and infrastructures for environmentally constrained and urbanised areas: IABSE symposium, Venice 2010 ; [34th International Symposium on Bridge and Structural Engineering, Venice, Italy, September 22 - 24, 2010] / [ed] Anton Steffen, Zürich: International Association for Bridge and Structural Engineering, 2010Conference paper (Refereed)
  • 43.
    Pétursson, Hans
    et al.
    Swedish Transport Administration, Borlänge.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Low-cycle fatigue strength of steel piles2010In: Large structures and infrastructures for environmentally constrained and urbanised areas: IABSE symposium, Venice 2010 ; [34th International Symposium on Bridge and Structural Engineering, Venice, Italy, September 22 - 24, 2010] / [ed] Anton Steffen, Zürich: International Association for Bridge and Structural Engineering, 2010, p. 628-629Conference paper (Refereed)
    Abstract [en]

    In integral abutment bridges clamped abutment piles are in addition to a compressive normal force subjected to bending load cycles from daily and yearly temperature variations. Through experiments with full-scale specimens representing a clamped pile it is shown that a steel pipe pile loaded in bending can withstand several hundred load cycles at strain ranges greater than 6 times the yield strain with almost full load bearing capacity. By means of an example it is shown that by permitting pile strains greater than the yield strain, in contrast to most present design codes, integral abutment bridges can be erected with a span length up to 500m and a prospected service life of 120 years.

  • 44.
    Ramanenka, Dmitrij
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Stjernberg, Jesper
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Jonsén, Pär
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Modelling of refractory brick furniture in rotary-kiln using finite element approach2014In: 11th World Congress on Computational Mechanics (WCCM XI) 5th European Conference on Computational Mechanics (ECCM V) 6th European Conference on Computational Fluid Dynamics (ECFD VI) / [ed] Eugenio Oñate; Xavier Oliver; Antonio Huerta, Barcelona: International Center for Numerical Methods in Engineering (CIMNE), 2014, Vol. 2, p. 1199-1210Conference paper (Refereed)
  • 45.
    Varedian, Mattias
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    A new improved type of friction connection: An experimental study2017In: IABSE Conference, Vancouver 2017: Engineering the Future, Zürich, Switzerland: IABSE -International Association for Bridges and Structural Engineering , 2017, p. 214-221Conference paper (Refereed)
    Abstract [en]

    Indenters in the slip planes of a bolted lap joint increase its load bearing capacity. In an experimental study, conducted at the Luleå University of Technology, Sweden, a part of the European R&D project PROLIFE, RFCS 2015-00025, indenters between two plates a) were loaded in compression and b) shear loaded in a lap joint. The load to press a 2.5 mm diameter stainless steel indenter 2.3 mm into the plates was 11 kN and the effective friction of the joint was improved. In a reference test with two shear planes and plain as rolled plates, no indenters and an M30 bolt pre-loaded to 320 kN, the joint slip resistance force was 54.5 kN and the effective friction coefficient μeff=0.09. For an identical arrangement but with 29 indenters per shear plane, the slip resistance was close to 250 kN and μeff was increased to 0.40, at the current Eurocode acceptable joint slip of 0.15 mm.

1 - 45 of 45
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