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| A nonlinear progressive damage model and strength analysis for 3D braided composites |
| Received:July 19, 2011 Revised:December 28, 2011 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20125024 |
| KeyWord:3D braided composites progressive damage strength numerical simulation FEM |
| Author | Institution |
| 韩小进 |
南京航空航天大学 机械结构力学及控制国家重点实验室, 南京 |
| 孙慧玉 |
南京航空航天大学 机械结构力学及控制国家重点实验室, 南京 |
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| Abstract: |
| A representative volume unit cell for 3D four-step braided composites with the periodic boundary condition was established to simulate the progressive damage behaviors.The Eshelby-Mori-Tanaka method was applied to calculate the stiffness matrix of damaged materials.In order to alleviate the mesh dependence,the size of the finite element and the crack were considered in the damage evolution equation.The non-linear stress-strain relationship and the critical tensile strength were obtained through numerical simulation,and the failure mechanism of composites with large braiding angle was also discussed.It is shown that the main failure modes of composites with large braiding angle are matrix cracking,transverse tensile and shear failure of yarns.The results in the paper agree well with the experiments in the literature. |