Simulating the effect of porosities on stiffness and strength of composite materials

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Original languageEnglish
Title of host publicationProceedings of the 10th International Conference on Computational Structures Technology, CST 2010
PublisherCivil-Comp Press
Volume93
ISBN (print)9781905088386
Publication statusPublished - 2010
Event10th International Conference on Computational Structures Technology, CST 2010 - Valencia, Spain
Duration: 14 Sept 201017 Sept 2010

Abstract

Predicting the material properties of imperfect composite structures with manufacturing defects such as waviness defects or porosities remains an open challenge. Several analytical approaches exist to determine the reduction of elastic properties due to porosity. However, these analytical methods do not account for the spatial distribution and the geometry of the voids. Size, shape, location and geometric distribution of the voids significantly influence the effect of porosity defects on material properties. In the work presented, a continuum damage mechanics approach is chosen to model porosity defects. Elastic-plastic material models for epoxy resin and fiber bundles have been developed. An invariant based quadratic failure criterion is used to model damage propagation. These material models are applied to study the failure modes induced by porosity defects and to obtain reduced homogenized material parameters for the macro scale. Different failure modes, such as kink-band failure can be observed and give valuable insight on the micromechanical behavior of imperfect structures. It is shown that the fiber misalignment angle has a significant influence on strength reduction.

Keywords

    Composite, Finite element method, Multiscale, Porosities, Voids

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Simulating the effect of porosities on stiffness and strength of composite materials. / Rolfes, R.; Czichon, S.; Vogler, M. et al.
Proceedings of the 10th International Conference on Computational Structures Technology, CST 2010. Vol. 93 Civil-Comp Press, 2010.

Research output: Chapter in book/report/conference proceedingConference contributionResearchpeer review

Rolfes, R, Czichon, S, Vogler, M & Jansen, E 2010, Simulating the effect of porosities on stiffness and strength of composite materials. in Proceedings of the 10th International Conference on Computational Structures Technology, CST 2010. vol. 93, Civil-Comp Press, 10th International Conference on Computational Structures Technology, CST 2010, Valencia, Spain, 14 Sept 2010. https://doi.org/doi:10.4203/ccp.93.272
Rolfes, R., Czichon, S., Vogler, M., & Jansen, E. (2010). Simulating the effect of porosities on stiffness and strength of composite materials. In Proceedings of the 10th International Conference on Computational Structures Technology, CST 2010 (Vol. 93). Civil-Comp Press. https://doi.org/doi:10.4203/ccp.93.272
Rolfes R, Czichon S, Vogler M, Jansen E. Simulating the effect of porosities on stiffness and strength of composite materials. In Proceedings of the 10th International Conference on Computational Structures Technology, CST 2010. Vol. 93. Civil-Comp Press. 2010 doi: doi:10.4203/ccp.93.272
Rolfes, R. ; Czichon, S. ; Vogler, M. et al. / Simulating the effect of porosities on stiffness and strength of composite materials. Proceedings of the 10th International Conference on Computational Structures Technology, CST 2010. Vol. 93 Civil-Comp Press, 2010.
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