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基于区域叠合技术(DST)对编织复合材料渐进损伤过程进行了分析,利用ANSYS参数化设计语言建立了参数化的编织件模型,应用单元切割法在单元边与切割面交点处增加新的节点,将新增节点与该单元部分其他节点重构单元,实现从编织件模型中切割出增强相单胞模型。分别利用Hashin准则与Von Mises准则判断增强相损伤和基体损伤,根据相应损伤模式按修正的Blackketter刚度退化方案对材料刚度进行退化,应用适用于损伤分析的刚度匹配方法,实现区域叠合技术在编织复合材料渐进损伤分析中的应用。提出损伤结果映射方法,实现了基于区域叠合技术所建基体模型的渐进损伤过程的结果显示。数值分析结果发现,区域叠合法分析结果与传统方法分析结果一致,且强度和断裂应变预测结果与试验结果相吻合。
Based on the regional overlap technique (DST), the gradual damage process of braided composites was analyzed. A parameterized braid model was established by ANSYS parametric design language. The unit cut method was used to add new nodes at the intersections of unit edges and cutting planes , The new node and other node reconstruction elements of the unit part are realized to cut out the enhanced phase single cell model from the braid model. Hashin criterion and Von Mises criterion are respectively used to judge reinforced phase damage and matrix damage. According to the corresponding damage mode, the material stiffness is degenerated according to the modified Blacketter stiffness degradation scheme. The stiffness matching method suitable for damage analysis is applied to realize the regional overlap technique in weaving Application of progressive damage analysis of composite materials. The damage result mapping method is proposed and the result of progressive damage process based on the matrix model built by region stacking technique is realized. The results of numerical analysis show that the results of regional overlap method are consistent with those of the traditional method, and the predicted results of strength and fracture strain are consistent with the experimental results.