关键词: 复合材料, 高精度通用单胞模型, 多尺度损伤, 裂纹扩展

Abstract:

In order to investigate the failure distribution of composites on micro and macro scales, this paper proposes a multi-scale method based on the High-Fidelity Generalized Method of Cells (HFGMC), which is applied to acquire strains and stresses on the macro scale, as well as on the micro scale. Combined with the multi-scale damage model, the component damages and crack extension are studied. The micro mechanics model requires fiber／matrix properties, strength parameters and the fiber volume rather than the properties and strengths of composites. The structural module requires further development for implementation of HFGMC into FE software ANSYS-LSDYNA via the user defined material subroutines (UMAT), which is used to analyze the stress distribution, components damage, and crack extension of laminates under the axial tensile condition. The calculated results are compared with the experimental results. The result indicates that the numerical load-stress curves agree with the experimental curves very well and that the predicted crack extension coincides with the experimental results.

Key words: composites, high-fidelity generalized method of cells, multi-scale damage analysis, crack extension