Details
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 10th International Conference on Computational Structures Technology, CST 2010 |
| Publisher | Civil-Comp Press |
| Volume | 93 |
| ISBN (print) | 9781905088386 |
| Publication status | Published - 2010 |
| Event | 10th International Conference on Computational Structures Technology, CST 2010 - Valencia, Spain Duration: 14 Sept 2010 → 17 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
ASJC Scopus subject areas
- Environmental Science(all)
- Environmental Engineering
- Engineering(all)
- Civil and Structural Engineering
- Computer Science(all)
- Computational Theory and Mathematics
- Computer Science(all)
- Artificial Intelligence
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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 proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Simulating the effect of porosities on stiffness and strength of composite materials
AU - Rolfes, R.
AU - Czichon, S.
AU - Vogler, M.
AU - Jansen, E.
PY - 2010
Y1 - 2010
N2 - 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.
AB - 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.
KW - Composite
KW - Finite element method
KW - Multiscale
KW - Porosities
KW - Voids
UR - http://www.scopus.com/inward/record.url?scp=84893818405&partnerID=8YFLogxK
U2 - doi:10.4203/ccp.93.272
DO - doi:10.4203/ccp.93.272
M3 - Conference contribution
SN - 9781905088386
VL - 93
BT - Proceedings of the 10th International Conference on Computational Structures Technology, CST 2010
PB - Civil-Comp Press
T2 - 10th International Conference on Computational Structures Technology, CST 2010
Y2 - 14 September 2010 through 17 September 2010
ER -