Abstract

A longitudinal failure criterion for UD composites based on a kinking model was re-constructed guided by the principles of analytic geometry. The proposed method for determining the fiber initial misalignment angle considers the shear nonlinear response of the matrix. An expression accounting for the fiber matrix coupling failure was used to simulate shear-driven fiber compression failure. Different effects of the matrix shear on the fiber tensile and compressive failure was considered. Compared with the kinking model, the proposed criterion better predicted the compression failure mode, gave better agreement with the experimental results, and exhibited better adaptability for different fiber failure modes.

摘要

以解析几何原理为指导，重新构建了基于扭结模型的 UD 复合材料纵向失效准则。所提出的确定光纤初始错位角的方法考虑了基体的剪切非线性响应。解释纤维基体耦合失效的表达式用于模拟剪切驱动的纤维压缩失效。考虑了基体剪切对纤维拉伸和压缩破坏的不同影响。与扭结模型相比，该准则更好地预测了压缩失效模式，与实验结果具有更好的一致性，对不同的光纤失效模式表现出更好的适应性。