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  • 51.
    Fransson, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Sandkvist, Jim
    Luleå tekniska universitet.
    Brash ice shear properties: laboratory tests1985In: POAC 85: the 8th International Conference on Port and Ocean Engineering Under Arctic Conditions : proceedings, Narssarssuaq, Greenland, September 7-14, 1985, Hørsholm: Dansk hydraulisk institut , 1985Conference paper (Refereed)
    Abstract [en]

    According to earlier studies of brash ice covered channels and problems connected with winter navigation laboratory tests have been performed, treating brash ice as a Mohr-Coulomb material cohesion and shear properties have been studied. A shear box, 0. 5 multiplied by 0. 5 m, equipped with a water bag for normal loading, was used. The force required to shear the rubble was determined as a function of normal force, shear rate and ice piece thickness. The test results are analyzed and presented. The results are also compared with results from other studies and the applicability is discussed

  • 52.
    Fransson, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Sandkvist, Jim
    SSPA Maritime Consulting AB.
    Kollisioner mellan flytande strukturer och mindre isberg: pendelförsök1987Report (Other academic)
  • 53.
    Fransson, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Sandkvist, Jim
    Pendelum indentation tests on manufactured ice1988In: International conference on technology for Polar Areas: Polartech ′88 / [ed] A. Hansen; J.F. Storm, Trondheim: Tapir Academic Press , 1988, Vol. 2, p. 669-678Conference paper (Refereed)
  • 54.
    Fransson, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Stehn, Lars
    Porosity effects on measured strength of warm ice1993In: POAC 93: the 12th International Conference on Port and Ocean Engineering under Arctic Conditions, 17. - 20. August 1993, Hamburg. Proceedings, HSVA , 1993, p. 23-26Conference paper (Refereed)
  • 55.
    Fransson, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Stehn, Lars
    Åström, Lars
    Håkansson, B.
    Omstedt, A.
    Variations of ice properties in an ice area of 1x2 km in the Gulf of Bothnia March 19881989In: POAC '89: 10th International conference on port and ocean engineering under arctic conditions / [ed] Kenneth B.E. Axelsson; Lennart Fransson, Luleå: Luleå tekniska universitet, 1989, Vol. 3, p. 1348-1357Conference paper (Other academic)
  • 56.
    Fransson, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Stenman, Ulf
    Mechanical properties of ice at Norströmsgrund2004Report (Other academic)
    Abstract [en]

    In March 2003, level ice with a thickness of 59 cm was sampled from an ice floe close to the lighthouse Norströmsgrund. Large pressure ridges were surrounding the floe, which had a diameter of about 60 meters. A total of 12 large ice cores with a diameter of 200 mm were drilled out along two rows, with an equidistance of two metres in the central part of the floe. The cores were put into plastic bags and were then directly transported with helicopter to the laboratory at Luleå University of Technology. Horizontal samples with a diameter of 70 mm were drilled from the large vertical cores at the depths 10, 20, 30, 40, 50 cm. Uniaxial compression tests on these samples were performed with three different nominal strain rates (0.5, 1, 2 x 10 -3 s-1) and three different temperatures (-1, -4, -10°C).

  • 57.
    Fransson, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Åström, Lars
    Lindholm, Jan-Erik
    Strength of warm porous ice in the Gulf of Bothnia: field investigation1992Report (Other academic)
    Abstract [en]

    When ice is crushed in a brittle manner as in most strength tests we assume that elasticity, fracture energy and sample size governs the result. For porous ice measured uniaxial strength was reduced due to the average size of the air bubbles and the assumed pre-existing cracks. The strength of porous granular ice was calculated from measured bulk density and earlier measured fracture toughness on pure ice. In general, a falling trend was traced as predicted with the presented formula although the scatter of the field data was large. Ice strength obtained from pressure-meter tests was comparable with those from the uniaxial compression tests when they were carried out shortly after sampling. The crystal analysis was supported with a video-camera which made it faster

  • 58. Nybacka, Mikael
    et al.
    Larsson, Tobias
    Jeppsson, Peter
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Ågren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Karlsson, Lennart
    Rantatalo, Matti
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Lindgren, Per
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Andren, Henrik
    Engström, Niclas
    Larsson, Roland
    Fransson, Lennart
    Hyyppä, Kalevi
    Fredriksson, Håkan
    Eriksson, Johan
    van Deventer, Jan
    Tingvall, Bror
    Project: CASTT - Centre for Automotive Systems Technologies and Testing2007Other (Other (popular science, discussion, etc.))
    Abstract [sv]

    Through the Centre for Automotive Systems Technologies and Testing, Luleå University of Technology aims to first of all support automotive winter testing in Northern Sweden. This means to support the local automotive test entrepreneurs and through them their customers: the car manufacturers and their suppliers. To succeed in this task, the center relies on the university's areas of leading research and most importantly on the cooperation between those areas.

  • 59.
    Olofsson, Thomas
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Fransson, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Sandkvist, Jim
    Luleå tekniska universitet.
    Ice crushing: failure mechanisms1991Report (Other academic)
    Abstract [en]

    From observations and recorded data it is concluded that the contact consist of a narrow line where the melting is attained at high indentation rates. The theoretical analysis and simulation of experiments indicates that the ratio of shear strength to contact pressure controls the fractal behaviour of ice crushing. The contact pressure and shear strength are related to the indentation velocity. As the indentation rate increases the ratio of shear strength to contact pressure decreases causing finer fragmentation of the crushed ice. At present the 2-D model predicts an upper limit of the ice load similar to the Morgan-Nuttall formula for shear failure of an ice sheet with a friction-less indentor.

  • 60.
    Patil, Aniket
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Sand, Björnar
    Fransson, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Finite element simulation of punch through test using a continuous surface cap model2015In: Proceedings of the 23nd International Conference on Port and Ocean Engineering under Arctic Conditions: POAC 2015, Trondheim, Norway; 14-18 June 2015, 2015Conference paper (Refereed)
    Abstract [en]

    An attempt has been made to calibrate the material model parameters of the continuous surface cap model with data from punch through tests performed in the Northern Gulf of Bothnia. An axisymmetric finite element model has been used to simulate the field tests. The continuous surface cap model based on a combination of elastic-plastic and continuum damage mechanics formulation is used as constitutive model for ice rubble. Material properties such as internal friction angle, cohesion and Young’s modulus are evaluated in a parametric study and the response is compared to the experimental data for the chosen test. An optimization algorithm is used for determining the parameters used for describing the continuous surface cap model. The material model parameters are chosen to get best fit to test load displacement curve. Conclusion has been drawn based on the application of continuous surface cap model on ice rubble.

  • 61.
    Patil, Aniket
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Sand, Björnar
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Fransson, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Numerical simulations of shear properties of ice rubble: a shear box experiment2013In: Proceedings of the 22nd International Conference on Port and Ocean Engineering under Arctic Conditions: June 9-13, 2013 Espoo, Finland, 2013Conference paper (Refereed)
    Abstract [en]

    Ice rubble has highly nonlinear behavior and thus simulate shear properties requires sophisticated constitutive models including a relatively large number of parameters and complicated calibration procedures. An attempt has been made to simulate shear properties of ice rubble. A shear box experiment is chosen from test series performed by Fransson and Sandkvist (1985). In this paper a shear box test is simulated with nonlinear finite element code LS-Dyna. A newly implemented material model in LS-Dyna called continuous surface cap model (CSCM) has been used in this simulation. This model is proposed by Schwer and Murray (1994). For the sake of simplicity, experimental results are compared with Mohr-Coulomb material model. A brief overview of continuous surface cap model is given. Finally, comparisons with experimental results have been made.

  • 62.
    Patil, Aniket
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Sand, Björnar
    Norut Northern Research Institute, Narvik.
    Fransson, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Smoothed particle hydrodynamics and continuous surface cap model to simulate ice rubble in punch through test2015In: Proceedings of the 23nd International Conference on Port and Ocean Engineering under Arctic Conditions: POAC 2015, Trondheim, Norway; 14-18 June 2015, 2015Conference paper (Refereed)
    Abstract [en]

    Recent trend in computational mechanics shows considerable development of numerical methods to simulate discrete materials such as ice rubble. Ice rubble has highly nonlinear behavior and to simulate shear properties requires a new numerical method. An attempt has been made to simulate a punch through test using the Lagrangian mesh-free partial based method formulation known as smoothed particle hydrodynamics. A newly implemented material model in LS-Dyna called the continuous surface cap model has been used in this simulation. A continuous surface cap model based on a combination of elastic-plastic and continuum damage mechanics formulation is used as constitutive model for ice rubble. The material model parameters are chosen to get best fit to test load displacement curve. A brief overview of the smoothed particle hydrodynamics is given. Finally, the results from simulations have compared with experimental results.

  • 63.
    Patil, Aniket
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Sand, Björnar
    Fransson, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Daiyan, Hamid
    Norut Northern Research Institute, Narvik.
    Constitutive Models for Sea Ice Rubble in First Year Ridges: A Literature Review2012In: International Association for Hydro-Environment Engineering and Research: 21st IAHR International Symposium on Ice / [ed] Yang LU, Dalian University of Technology Press, China: Dalian University of Technology Press, 2012, p. 623-638, article id T11118Conference paper (Refereed)
    Abstract [en]

    Exploration and production of hydrocarbons in arctic areas demands stronger, lighter and safer offshore structures. Wind and sea currents are responsible for ice loads on structure. The design of these structures is based on load level which is usually determined by the drift ice features i.e. ice ridges and surrounding level ice fields if icebergs are not dominating in the area. Ridges drift and hit fixed or moored surface structures such as platforms or ships, or they may scour the seabed endangering pipelines and wellheads. Realistic Constitutive models will help to build more accurate numerical analysis of the ice load. It will decrease the capital costs for the offshore structures, resulting in more economic field development for arctic offshore. This literature review paper is focused on existing models used to simulate the constitutive behaviorof the ice rubble. In first chapter ridge types, their formation and typical geometrical features has been discussed. Second chapter gives a review of Ice Rubble Failure and Deformation Mechanisms are discussed. Third chapter gives a brief comparison of between discrete model and continuum model. Fourth chapter is about existing constitutive models which are proposedand used to simulate ice structure interaction process. Calibration, advantages and disadvantages has been discussed in this chapter. Lastly, a summery is given about paper. Readership require familiarity with constitutive modelling used in numerical analysis especially finite element analysis.

  • 64.
    Petrich, Christian
    et al.
    Norut Northern Research Institute, Narvik.
    Sæther, Irina
    Norut Northern Research Institute, Narvik.
    Fransson, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Sand, Björnar
    Norut Northern Research Institute, Narvik.
    Arntsen, Bård
    Norut Northern Research Institute, Narvik.
    Time-dependent spatial distribution of thermal stresses in the ice cover of a small reservoir2015In: Cold Regions Science and Technology, ISSN 0165-232X, E-ISSN 1872-7441, Vol. 120, p. 35-44Article in journal (Refereed)
    Abstract [en]

    Static ice loads (ice actions) are a key design parameter for dams in cold climates. However, their theoretical description is still elusive, introducing uncertainty in design and hindering development of remediation measures. We present and analyze measurements of stresses due to thermal loads in a small reservoir in northern Norway. Several weeks of observations, including both cold and warm spells, were well-described by a simple equation that accounts for thermal expansion and temperature-dependent creep. One model parameter was found to depend systematically on the location of measurements within the reservoir. Biaxial stress measurements showed that the stress field was not homogeneous. Results suggest that the stress field in reservoirs should be predictable from first principles with numerical methods and point toward a promising, simple parameterization.

  • 65. Riska, Kaj
    et al.
    Leiviskä, Topi
    Nyman, T.
    Fransson, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Lehtonen, J.
    Eronen, H.
    Backman, A.
    Ice performance of the Swedish multi-purpose icebreaker Tor Viking II2002In: 16th international conference on Port and ocean engineering under Arctic conditions; ice engineering applied to offshore regions, Aug. 12-17, 2001, Ottawa, ON, Canada., National Research Council of Canada , 2002, p. 849-865Conference paper (Refereed)
  • 66.
    Sand, B.
    et al.
    Norut Northern Research Institute, Narvik.
    Fransson, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Influence of structural geometry on the ice pressure distribution on vertical structures2011In: Arctic Technology Conference 2011: Houston, Texas, USA, 7 - 9 February 2011 ; [ATC], Red Hook: Curran Associates, Inc., 2011, p. 514-523Conference paper (Refereed)
    Abstract [en]

    The interaction of ice sheets with rigid vertical structures is an important problem in the design of arctic offshore structures. Offshore structures often experience an enormous ice load since the ice sheet breaks by crushing into the structure. The finite element method is adopted to calculate ice forces on vertical structures of various shapes. The effect of material nonlinearities and friction between the ice and structure is taken into account. The ice is treated as a transversely isotropic, nonlinear material and formation of crushing or cracking is treated as a transformation of state. The contact interaction between the ice sheet and the structure is simulated with a contact formulation based on finite sliding interaction between a deformable body and a rigid body with Coulomb friction sliding. To verify the applicability of the proposed constitutive models, the numerical results obtained during the present study are compared with data from field measurements

  • 67. Sand, Björnar
    et al.
    Fransson, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Influence of structure geometry on ice pressure on a vertical foundation2009In: Proceedings of the 20th International Conference on Port and Ocean Engineering under Arctic Conditions: June 9-12, 2009, Luleå, Sweden, 2009Conference paper (Refereed)
    Abstract [en]

    The interaction of ice sheets with rigid vertical structures is an important problem in the design of arctic offshore structures. These structures often experience an enormous ice load since the ice sheet fails by crushing. The finite element method is adopted to calculate ice forces on vertical structures of various shapes. The effect of material nonlinearities and friction between the ice and structure is taken into account. The ice is treated as a transversely isotropic, nonlinear material and formation of crushing or cracking is treated as a transformation of state. The contact interaction between the ice sheet and the structure is simulated with a contact formulation based on finite sliding interaction between a deformable body and a rigid body with Coulomb friction sliding. To verify the applicability of the proposed constitutive models, the numerical results obtained during the present study are compared with data from field measurements.

  • 68. Sand, Björnar
    et al.
    Fransson, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Nonlinear finite element simulations of ice sheet forces on conical structures2006In: Proceedings of the 25th International Conference on Offshore Mechanics and Arctic Engineering: presented at the 25th International Conference on Offshore Mechanics and Arctic Engineering : June 4-9, 2006, Hamburg, Germany, New York: American Society of Mechanical Engineers , 2006, Vol. 2, p. 773-782Conference paper (Refereed)
    Abstract [en]

    The present paper deals with interaction between an ice sheet and fixed, conical structures. The ice sheet as well as the structure is discretizied by finite elements. The interaction between the ice sheet and the conical structure is simulated using a special contact algorithm which makes it possible to follow the gradually developing contact between the two bodies. As the configuration of the ice sheet under the interaction process changes, the buoyancy forces changes accordingly. This process is traced by introducing a continuous nonlinear foundation model to include the effects of buoyancy forces and specific weight of the ice. The mechanical behavior of ice is approximated using two different constitutive models. In the first case the ice is treated as an isotropic, brittle material, while in the second case the ice is considered being a transversal isotropic and brittle material. When the state of stress at a material point in the ice reaches the failure surface, cracking or crushing is said to occur. After cracking or crushing, the post peak behavior of the ice is approximated as a rigid plastic material. The results from the finite element simulations are compared with analytical methods for calculation of ice sheet forces on conical structures.

  • 69.
    Sandkvist, Jim
    et al.
    SSPA Maritime Consulting AB.
    Fransson, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Forsman, Björn
    SSPA Maritime Consulting AB.
    Dynamisk respons av interaktion vid iskrossning: extrusion -/ krossningsförsök1990Report (Other academic)
  • 70. Stehn, Lars
    et al.
    Fransson, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    A field instrument for fracture toughness testing of ice1989In: POAC '89: 10th International conference on port and ocean engineering under arctic conditions / [ed] Kenneth B.E. Axelsson; Lennart Fransson, Luleå: Luleå tekniska universitet, 1989, Vol. 1, p. 300-310Conference paper (Other academic)
  • 71. Stehn, Lars
    et al.
    Fransson, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    A field instrument for fracture toughness testing of ice1988Report (Other academic)
  • 72. Stehn, Lars
    et al.
    Fransson, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    The Gulf of Bothnia: a testing area for arctic offshore installations1988In: International conference on technology for Polar areas: Polartech ′88 / [ed] A. Hansen; J.F. Storm, Trondheim: Tapir Academic Press , 1988, Vol. 1, p. 249-260Conference paper (Refereed)
  • 73. Stehn, Lars
    et al.
    Fransson, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Forsman, Björn
    SSPA.
    Sandkvist, Jim
    Janson, Jan Erik
    Högbom, Thomas
    The Gulf of Bothnia: a testing area for arctic offshore installations1988Report (Other academic)
  • 74.
    Sudom, Denise
    et al.
    National Research Council of Canada, Canadian Hydraulics Centre, Ottawa, ON.
    Timco, Garry
    National Research Council of Canada, Canadian Hydraulics Centre, Ottawa, ON.
    Sand, Björnar
    Norut Northern Research Institute, Narvik.
    Fransson, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Analysis of first-year and old ice ridge characteristics2011In: Proceedings of the 21st International Conference on Port and Ocean Engineering under Arctic Conditions, 2011Conference paper (Refereed)
    Abstract [en]

    A study has been carried out on the morphological characteristics of arctic and subarctic iceridges, with an emphasis on the differences between first-year and second- or multi-year iceridges. This work builds on the catalogue of ridge shapes created by Timco and Burden in 1995.Sail height, keel depth, and total ridge thickness are investigated, focussing on the differencesbetween first-year and old ridges, and considering the effect of grounding. The consolidated layerthickness and width and overall dimensions of ridges are also examined. Comparisons are madefor arctic and temperate ridges. The arctic regions include the Barents and Norwegian Seas, andthe Beaufort Sea and Canadian/American Arctic. Temperate regions include the Baltic Sea, Gulfof Bothnia, Gulf of Finland, Bering Sea, Sea of Okhotsk, Labrador Coast, and CanadianMaritimes. Relationships between sail height and keel depth are developed, and the findings ofthis study are evaluated against existing statistics and formulae.

  • 75. Fransson, Lennart (Editor)
    Ice mechanics and shipping in ice-infested waters2008Report (Other academic)
    Abstract [sv]

    Följande rapport ingår i projektet "Ismekanikk og havnedrift i islagte farvann" (delprogrammet Nordkalotten INTERREG III A Nord). Denna rapport är huvuddokumentet där alla delrapporter inom projektet sammanställts. Övriga rapporter som ingår är följande: - Nonlinear finite element simulations of ice forces on offshore structures - Mätning av islaster med isbrytare - Ice Induced Vibrations of Slender Structures - Isförhållanden längs svenska kusten, Bottenviken, Bottenhavet och Barents hav - Ice Control Measures in Swedish Harbours - Database Norströmsgrund

12 51 - 75 of 75
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