连续损伤力学在复合材料厚壁圆筒渐进破坏分析中的应用

摘要

To research the damage mechanism of the composite thick-wall cylinder, based on the continuum damage mechanics theory, an energy-based stiffness degradation method is proposed to predict the progressive failure properties of a steel-carbon fiber/polyimide composite thick-wall cylinder. Three failure modes of carbon fiber/polyimide composites, including fiber breakage, matrix cracking and fiber/matrix interface shear failure are considered in the model. A three-dimensional finite element technique including the multiframe restart analysis and the arc-length algorithm is employed to conduct the progressive failure analysis. The result shows that: matrix cracks first, then the fiber breakage causes final failure of the whole structure before interface shear failure and liner damage; there is no shear failure or lining failure in this process; the strength of fiber decides the strength of composite thick-wall cylinder.%为研究复合材料枪管破坏机理,基于连续损伤力学理论,该文采用以能量为基准的刚度退化方法预测了钢-碳纤维/聚酰亚胺复合材料厚壁圆筒的渐进破坏行为.模型考虑了碳纤维/聚酰亚胺复合材料的三种破坏模式:纤维断裂、基体损伤和层间剪切失效.在渐进破坏分析中,采用了包括多帧重启动分析和孤长法的三维有限元技术.计算结果表明:基体首先破坏;随后纤维开始断裂,引起整体结构屈服破坏;这个过程中没有层间剪切失效和内衬单元破坏;厚壁圆筒整体的强度主要受纤维强度的影响.