复合材料端框渐进损伤分析方法与试验

摘要

针对复合材料格栅加筋圆筒的上下端框,进行了3种不同尺寸和铺层顺序的端框片段模型的拉伸试验,得出其破坏形式和极限载荷.建立端框的有限元模型,基于不同的强度理论进行端框的渐进损伤分析,并对计算结果进行比较.以Zinoviev强度理论为基础,从破坏判据和刚度衰减两方面将其扩展为三维理论,并结合Hashin准则进行破坏模式的判断,形成了改进的Zinoviev强度理论,并以此进行端框模型的损伤演化分析和强度预报,数值模拟结果与试验结果取得了很好的一致性.%Aiming at the upper and lower end frames of the grid stiffened composite cylinder,the tensile tests of three kinds of end frame segment models with different sizes and stacking sequence were conducted.Thus the damage forms and ultimate load of the end frames were gained.The progressive damage analysis based on various strength theories was conducted by finite element method,and the results of different theories were compared.Based on Zinoviev strength theory,by expanding its failure criterion and stiffness degradation scheme to three-dimensional format,and introducing Hashin criterion to estimate the damage modes,the modified Zinoviev theory was developed.The proposed method was used to carry out damage evolution analysis and strength prediction of the end frame model.The results of numerical simulation show good agreement with test results.