基于渐进损伤的Ⅳ型复合材料气瓶的爆破压强预测分析

Prediction and analysis of burst pressure of type Ⅳ composite cylinder based on progressive damage

本文引入Hashin失效准则,编译了USDFLD的子程序,通过ABAQUS-WCM软件实现了基于渐进损伤的Ⅳ型复合材料气瓶有限元数值模拟,并且最终缠绕成型复合材料气瓶进行爆破试验验证。渐进损伤的有限元分析结果表明,Ⅳ型复合材料气瓶的金属接头最大直径圆位置以及筒身段与封头过渡位置容易造成复合材料层的应力集中,为最先出现树脂基体以及纤维拉伸断裂失效的位置,并且树脂基体的失效先于纤维断裂失效,且失效面积较大。气瓶的爆破结果表明,预测的爆破压强和失效位置与真实试验结果较为接近,验证了模型的有效性。

In this paper,Hashin failure criterion was introduced,USDFLD subroutine was compiled,and finite element numerical simulation of typeⅣcomposite cylinder based on progressive damage was realized by ABAQUS-WCM software.Finally,the composite cylinders were prepared and verified by blasting experiment.The finite element analysis(FEA)results of progressive damage show that the maximum diameter circle of the metal joint and the transition position between the cylinder and the head of theⅣcomposite cylinder are easy to cause the stress concentration of the composite layer,which is the first position where the tensile fracture failure of the resin matrix and the fiber occurs,and the failure of the resin matrix is prior to the failure of the fiber,and the failure area is larger.The results of composite cylinder blasting results show that the predicted blasting pressure and failure position are close to the real test results,which verifies the validity of the FEA model.