With the increasing requirements for material properties in the aerospace field, woven composites have become ideal materials due to their advantages such as high specific strength. Based on the classical laminated plate theory and the fiber bundle compression failure criterion, the compression performance parameters of the bending weft fiber bundles are modified. Then, combined with the meso-finite element method, the compression failure behavior of 3D woven composites is investigated. The results show that the compressive performance parameters predicted by the model are in good agreement with the experimental results. The stress-strain response of the weft-direction compression is approximately linear, and the longitudinal damage of the weft fiber bundles will lead to the overall failure. The stress-strain response of the warp-direction compression is nonlinear, and the longitudinal damage of the warp fiber bundles in the cross-layer staggered area leads to the warp-direction failure. The bending of the weft fiber bundles significantly reduces the weft-direction compressive modulus and strength of the composites. The me-so-finite element model can well predict the compressive mechanical behavior of the material. Considering the bending effect of the weft fiber bundles in the analysis can improve the simulation accuracy.

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Research on the Compressive Failure Behavior of Woven Composites Based on Meso-Finite Element Method

  • Chao Hang,
  • Yonghui Chen

摘要

With the increasing requirements for material properties in the aerospace field, woven composites have become ideal materials due to their advantages such as high specific strength. Based on the classical laminated plate theory and the fiber bundle compression failure criterion, the compression performance parameters of the bending weft fiber bundles are modified. Then, combined with the meso-finite element method, the compression failure behavior of 3D woven composites is investigated. The results show that the compressive performance parameters predicted by the model are in good agreement with the experimental results. The stress-strain response of the weft-direction compression is approximately linear, and the longitudinal damage of the weft fiber bundles will lead to the overall failure. The stress-strain response of the warp-direction compression is nonlinear, and the longitudinal damage of the warp fiber bundles in the cross-layer staggered area leads to the warp-direction failure. The bending of the weft fiber bundles significantly reduces the weft-direction compressive modulus and strength of the composites. The me-so-finite element model can well predict the compressive mechanical behavior of the material. Considering the bending effect of the weft fiber bundles in the analysis can improve the simulation accuracy.