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Mattsson, David
Publications (10 of 15) Show all publications
Pupurs, A., Varna, J., Loukil, M. & Mattsson, D. (2014). Damage development and stiffness reduction in laminates in out-of-plane loading (ed.). In: (Ed.), 16th European Conference on Composite Materials, ECCM 2014: Seville, Spain, 22 - 26 June 2014. Paper presented at European Conference on Composite Materials : 22/06/2014 - 26/06/2014. European Conference on Composite Materials, ECCM
Open this publication in new window or tab >>Damage development and stiffness reduction in laminates in out-of-plane loading
2014 (English)In: 16th European Conference on Composite Materials, ECCM 2014: Seville, Spain, 22 - 26 June 2014, European Conference on Composite Materials, ECCM , 2014Conference paper, Published paper (Refereed)
Abstract [en]

Simple approach based on Classical Laminate Theory (CLT) and effective stiffness of damaged layer is suggested for bending stiffness determination of laminate with intralaminar cracks in surface 90-layers. The effective stiffness of layer with cracks as a function of crack density is back-calculated comparing in-plane stiffness of laminates with and without damage. The accuracy of the CLT and effective stiffness approach is demonstrated comparing with bending stiffness results from FEM simulated 4-point bending test on laminate with damage. Analytical model for damaged laminate stiffness is presented which gives similar values for effective stiffness as FEM calculations for unit cell. Effect of local delaminations initiated from transverse cracks is analyzed.

Place, publisher, year, edition, pages
European Conference on Composite Materials, ECCM, 2014
Keywords
Analytical modeling, Bending stiffness, FEM, Intralaminar crack
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-37558 (URN)2-s2.0-84915750600 (Scopus ID)b9f6ea2b-3372-4574-9a0b-3232e750a996 (Local ID)9780000000002 (ISBN)b9f6ea2b-3372-4574-9a0b-3232e750a996 (Archive number)b9f6ea2b-3372-4574-9a0b-3232e750a996 (OAI)
Conference
European Conference on Composite Materials : 22/06/2014 - 26/06/2014
Note

Godkänd; 2014; 20141217 (andbra)

Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2019-08-20Bibliographically approved
Mattsson, D., Joffe, R. & Varna, J. (2008). Damage in NCF composites under tension: effect of layer stacking sequence (ed.). Paper presented at . Engineering Fracture Mechanics, 75(9), 2666-2682
Open this publication in new window or tab >>Damage in NCF composites under tension: effect of layer stacking sequence
2008 (English)In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 75, no 9, p. 2666-2682Article in journal (Refereed) Published
Abstract [en]

Non-crimp fabric (NCF) cross-ply composites response to tensile loading is investigated showing large effect of the fabric layer stacking sequence: much larger elastic modulus reduction was observed in [0/90/0/90]S than in [90/0/90/0]S case. Since transverse cracks in 90°-bundles may give modulus decrease about 5%, the observed 40% stiffness reduction is attributed to failure and delamination of bundles oriented in the direction of the applied load. Analysis of micrographs shows extensive delaminations and 0°-bundle breaks. FE calculations showed that failure of 0°-bundles at the surface is energetically more favorable. However, the fracture resistance of surface bundles is higher due to smaller bundle waviness and the density of bundle cracks on the surface was not larger than inside. Two possible reasons for the higher stiffness reduction in the [0/90/0/90]S NCF composite were suggested: (a) If two imperfect 0°-bundle layers are separated by a 90°-bundle layer their resistance to failure is lower than when they are situated next to each other; (b) the effect of each surface 0°-bundle break on the composite stiffness is larger (due to less constraint from the surrounding material the opening of surface bundle breaks is much larger).

National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-12108 (URN)10.1016/j.engfracmech.2007.03.014 (DOI)000255253500008 ()2-s2.0-40649092359 (Scopus ID)b2d0ee40-0ea2-11dc-b9dd-000ea68e967b (Local ID)b2d0ee40-0ea2-11dc-b9dd-000ea68e967b (Archive number)b2d0ee40-0ea2-11dc-b9dd-000ea68e967b (OAI)
Note
Validerad; 2008; 20070530 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Mattsson, D. & Varna, J. (2007). Average strain in fiber bundles and its effect on NCF composite stiffness (ed.). Journal of engineering materials and technology, 129(2), 211-219
Open this publication in new window or tab >>Average strain in fiber bundles and its effect on NCF composite stiffness
2007 (English)In: Journal of engineering materials and technology, ISSN 0094-4289, E-ISSN 1528-8889, Vol. 129, no 2, p. 211-219Article in journal (Refereed) Published
Abstract [en]

Transverse strain in bundles governs transverse cracking in noncrimp fabric (NCF) composites. Finite element (FE) analysis shows that this strain may be significantly lower than the applied macroscopic strain component in the same direction. This feature is important for damage evolution modeling. The isostrain assumption which in different combinations is widely used in stiffness models is inadequate because the strain in different mesoelements (bundles of different orientation and matrix regions) is assumed the same. Analyzing by FEM the importance of media surrounding the bundle on average transverse strain it was found that an increasing ratio of the bundle transverse stiffness to the matrix stiffness leads to a decrease of the strain in the bundle. An increase of the stiffness in the same direction in adjacent layers leads to an increase of the transverse strain in the bundle. Higher bundle volume fraction in the layer leads to larger transverse strain in the bundle. These trends are described by a power law and used to predict the average strain in bundles. The calculated H matrix which establishes the relationship between strains in the mesoelement and representative volume element strains is used to calculate the "effective stiffness" of the bundle. This effective stiffness is the main element in simple but exact expressions derived to calculate the stiffness matrix of NCF composites. Considering the three-dimensional (3D) FE model as the reference, it was found that all homogenization methods used in this study have sufficient accuracy for stiffness calculations, but only the presented method gives reliable predictions of strains in bundles.

National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-15879 (URN)10.1115/1.2400266 (DOI)000246327500007 ()2-s2.0-34249863909 (Scopus ID)f716f120-683a-11dc-a0c3-000ea68e967b (Local ID)f716f120-683a-11dc-a0c3-000ea68e967b (Archive number)f716f120-683a-11dc-a0c3-000ea68e967b (OAI)
Note

Validerad; 2007; 20070921 (ysko)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Mattsson, D., Joffe, R. & Varna, J. (2007). Methodology for characterization of internal structure parameters governing performance in NCF composites (ed.). Paper presented at . Composites Part B: Engineering, 38(1), 44-57
Open this publication in new window or tab >>Methodology for characterization of internal structure parameters governing performance in NCF composites
2007 (English)In: Composites Part B: Engineering, ISSN 1359-8368, E-ISSN 1879-1069, Vol. 38, no 1, p. 44-57Article in journal (Refereed) Published
Abstract [en]

Mechanical performance of non-crimp fabric composites is very dependent on their internal meso- and micro-structure which is defined by the manufacturing process of the fabric and composite processing conditions. This paper identifies the most important parameters which control mechanical properties of these materials. The identification is based on experimental observations and available theoretical findings. Characteristics of the internal structure of non-crimp fabric composites are analyzed in context of their significance for in-plane elastic and failure properties. Methodology for determination of most typical geometrical parameters of composites using optical observations of cross-sections of manufactured laminates is described. The methodology is applied to characterize cross-ply and quasi-isotropic composite laminates. These results are analyzed and a comparison between the laminates is performed.

National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-4031 (URN)10.1016/j.compositesb.2006.04.004 (DOI)000241179200005 ()2-s2.0-33747882196 (Scopus ID)1e2dd0d0-7a6b-11db-8824-000ea68e967b (Local ID)1e2dd0d0-7a6b-11db-8824-000ea68e967b (Archive number)1e2dd0d0-7a6b-11db-8824-000ea68e967b (OAI)
Note
Validerad; 2007; 20061122 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Joffe, R. & Mattsson, D. (2006). Methodology for characterization of internal structure of NCF composite and its influence on mechanical properties (ed.). In: (Ed.), (Ed.), Proceedings of the 3rd International Conference on Composites Testing and Model Identification: CompTest 2006. Paper presented at International Conference on Composites Testing and Model Identification : 22/04/2013 - 24/04/2013 (pp. 64-65). : Faculty of Engineering, University of Porto, Portugal
Open this publication in new window or tab >>Methodology for characterization of internal structure of NCF composite and its influence on mechanical properties
2006 (English)In: Proceedings of the 3rd International Conference on Composites Testing and Model Identification: CompTest 2006, Faculty of Engineering, University of Porto, Portugal , 2006, p. 64-65Conference paper, Meeting abstract (Other academic)
Place, publisher, year, edition, pages
Faculty of Engineering, University of Porto, Portugal, 2006
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-30520 (URN)45e508b0-f28d-11db-bb1b-000ea68e967b (Local ID)45e508b0-f28d-11db-bb1b-000ea68e967b (Archive number)45e508b0-f28d-11db-bb1b-000ea68e967b (OAI)
Conference
International Conference on Composites Testing and Model Identification : 22/04/2013 - 24/04/2013
Note
Godkänd; 2006; 20070424 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-01-16Bibliographically approved
Joffe, R. & Mattsson, D. (2006). NCF cross-ply laminates: damage accumulation and degradation of elastic properties (ed.). In: (Ed.), E. E. Gdoutos (Ed.), Fracture of Nano and Engineering Materials and Structures: Proceedings of the 16th European Conference of Fracture, Alexandroupolis, Greece, July 3-7, 2006. Paper presented at European Conference of Fracture : 03/07/2006 - 07/07/2006 (pp. 1281-1288). : Encyclopedia of Global Archaeology/Springer Verlag, Paper 450
Open this publication in new window or tab >>NCF cross-ply laminates: damage accumulation and degradation of elastic properties
2006 (English)In: Fracture of Nano and Engineering Materials and Structures: Proceedings of the 16th European Conference of Fracture, Alexandroupolis, Greece, July 3-7, 2006 / [ed] E. E. Gdoutos, Encyclopedia of Global Archaeology/Springer Verlag, 2006, Vol. Paper 450, p. 1281-1288Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Encyclopedia of Global Archaeology/Springer Verlag, 2006
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-38476 (URN)ce40a740-eeb0-11db-bb5c-000ea68e967b (Local ID)978-1402049712 (ISBN)ce40a740-eeb0-11db-bb5c-000ea68e967b (Archive number)ce40a740-eeb0-11db-bb5c-000ea68e967b (OAI)
Conference
European Conference of Fracture : 03/07/2006 - 07/07/2006
Note
Godkänd; 2006; 20070419 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-01-16Bibliographically approved
Joffe, R., Mattsson, D., Modniks, J. & Varna, J. (2005). Compressive failure analysis of non-crimp fabric composites with large out-of-plane misalignment of fiber bundles (ed.). Paper presented at . Composites. Part A, Applied science and manufacturing, 36(8), 1030-1046
Open this publication in new window or tab >>Compressive failure analysis of non-crimp fabric composites with large out-of-plane misalignment of fiber bundles
2005 (English)In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 36, no 8, p. 1030-1046Article in journal (Refereed) Published
Abstract [en]

Failure initiation under compressive loading in non-crimpfabric composites containing bundles with out-of-plane orientation imperfections was analyzed using FEM in plane stress and linear elastic formulation. The bundle orientation imperfection in a composite unit was described by a sine function. Failure initiation strain was determined comparing failure functions corresponding to two alternative failure mechanisms: (a) plastic microbuckling in bundle due to mixed compressive and shear load; (b) plastic matrix yielding according to von Mises criterion. Parameters for compressive failure initiation analysis were bundle misalignment angle, fiber volume fraction inside the bundle and bundle volume fraction inside the composite unit. The support effect of the neighbouring material was analyzed varying boundary conditions and solving cases with particular configuration of surrounding material. Model prepreg tape GF/EP composite with different introduced levels of out-of-plane waviness of layers was used to validate the conclusions from parametric analysis.

National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-15798 (URN)10.1016/j.compositesa.2004.10.028 (DOI)000230212600002 ()2-s2.0-18844438346 (Scopus ID)f5a76bd0-c358-11db-9ea3-000ea68e967b (Local ID)f5a76bd0-c358-11db-9ea3-000ea68e967b (Archive number)f5a76bd0-c358-11db-9ea3-000ea68e967b (OAI)
Note
Validerad; 2005; 20070116 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Varna, J., Lundmark, P., Mattsson, D. & Megnis, M. (2005). Constitutive models for composite laminates with matrix cracks and fiber breaks (ed.). In: (Ed.), (Ed.), Proceedings of the International Conference on Fracture and Damage Mechanics IV: . Paper presented at International conference on fracture and damage mechanics : 12/07/2005 - 14/07/2005 (pp. 597-604).
Open this publication in new window or tab >>Constitutive models for composite laminates with matrix cracks and fiber breaks
2005 (English)In: Proceedings of the International Conference on Fracture and Damage Mechanics IV, 2005, p. 597-604Conference paper, Published paper (Refereed)
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-37817 (URN)bf3597f0-0bbc-11dc-8745-000ea68e967b (Local ID)bf3597f0-0bbc-11dc-8745-000ea68e967b (Archive number)bf3597f0-0bbc-11dc-8745-000ea68e967b (OAI)
Conference
International conference on fracture and damage mechanics : 12/07/2005 - 14/07/2005
Note
Godkänd; 2005; 20070526 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Joffe, R., Mattsson, D. & Varna, J. (2005). Damage tolerance of cross-ply non-crimp fabric composites (ed.). In: (Ed.), (Ed.), The fifth Canadian international composites conference: . Paper presented at Canadian International Composites Conference : 16/08/2005 - 19/08/2005. : CACSMA
Open this publication in new window or tab >>Damage tolerance of cross-ply non-crimp fabric composites
2005 (English)In: The fifth Canadian international composites conference, CACSMA , 2005Conference paper, Published paper (Other academic)
Place, publisher, year, edition, pages
CACSMA, 2005
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-35701 (URN)a59f8920-9205-11dc-9a81-000ea68e967b (Local ID)a59f8920-9205-11dc-9a81-000ea68e967b (Archive number)a59f8920-9205-11dc-9a81-000ea68e967b (OAI)
Conference
Canadian International Composites Conference : 16/08/2005 - 19/08/2005
Note
Godkänd; 2005; Bibliografisk uppgift: CD-ROM Conference also known as CANCOM; 20071113 (joffe)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-01-16Bibliographically approved
Mattsson, D. (2005). Mechanical performance of NCF composites (ed.). (Doctoral dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Mechanical performance of NCF composites
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Composite materials are today in widespread use in the aerospace and marine industries due to their excellent strength and stiffness to weight ratio. In most marine and aerospace applications traditional composites (pre- impregnated tapes) are still the main choice for design of load bearing structures. Nevertheless, due to their high material costs and sensitivity to out-of-plane loads (eg impact), the use of composites manufactured from pre-impregnated tapes (prepregs) has so far been limited. Non-crimp fabric (NCF) based composites address both these concerns, without any significant drop in in-plane performance. In the presented thesis, the mechanical performance of NCF composites is investigated. NCF cross-ply composites have been tested in tension and the effect on mechanical properties due to intralaminar cracks in the 90° layer has been monitored. Effects of damage on mechanical properties are modeled using modified micro mechanical models developed for analysis of conventional laminated composites. The analysis reveals that the mechanical degradation is ruled by the crack opening displacement. Furthermore, NCF cross-ply composites response to tensile loading show large effect of the fabric layer stacking sequence: much larger elastic modulus reduction was observed in [0/90/0/90]S than in [90/0/90/0]S case. Since transverse cracks in 90°- bundles may give modulus decrease about 5%, the observed 40% stiffness reduction is attributed to failure and delamination of bundles oriented in the direction of the applied load. Analysis of micrographs shows extensive delaminations and 0°-bundle breaks. Transverse strain in bundles governs transverse cracking in NCF composites and FE analysis reveals that this strain may be significantly lower than the applied macroscopic strain component in the same direction. This feature is important for damage evolution modelling. Analysing by FEM the importance of media surrounding the bundle on average transverse strain it was found that a power law could be used to predict the average strain in bundles. A calculated H-matrix which establishes the relationship between strains in meso-element and RVE strains could then be used to calculate the “effective stiffness” of the bundle. This “effective stiffness” is the main element in simple but exact expressions derived to calculate the stiffness matrix of NCF composites. Failure initiation under compressive loading in NCF composites containing bundles with out-of plane orientation imperfections has been analyzed using FEM in plane stress and linear elastic formulation. The bundle orientation imperfection in a composite unit was described by a sine function. Failure initiation strain was determined comparing failure functions corresponding to two alternative failure mechanisms: a) plastic microbuckling in the bundle due to mixed compressive and shear load; b) plastic matrix yielding according to von Mises criterion. Parameters for compressive failure initiation analysis were bundle misalignment angle, fiber volume fraction inside the bundle and bundle volume fraction inside the composite unit. Mechanical performance of NCF composites is very dependent on their internal meso- and micro- structure which is defined by the manufacturing process of the fabric and composite processing conditions. This thesis identifies the most important parameters which control mechanical properties of these materials. The identification is based on experimental observations and available theoretical findings. Characteristics of the internal structure of NCF composites are analyzed in context of their significance for in-plane elastic and failure properties. A methodology for the determination of the most typical geometrical parameters of composites using optical observations of cross-sections of manufactured laminates is described.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2005. p. 25
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544 ; 2005:49
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-17286 (URN)29bcf470-5159-11db-9592-000ea68e967b (Local ID)29bcf470-5159-11db-9592-000ea68e967b (Archive number)29bcf470-5159-11db-9592-000ea68e967b (OAI)
Note
Godkänd; 2005; 20061001 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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