基于逐渐损伤理论的复合材料飞轮转子渐进失效分析

Progressive Failure Analysis of Composite Flywheel Rotor Based on Progressive Damage Theory

基于三维逐渐损伤理论,采用刚度衰减模型来预测三维复合材料飞轮转子的渐进失效特性,并与已有参考文献进行比对,验证模型的正确性。模型考虑的失效形式主要包括四种:纤维断裂,基体开裂,分层和基纤剪切失效。采用有限元法中的牛顿-拉普森非线性迭代算法进行三维渐进失效分析,分析不同缠绕预应力下飞轮的失效过程,并进行对比分析。计算结果表明,转子的失效首先发生在飞轮的中部,单元发生基体开裂失效,随着转速的提高,单元发生纤维断裂,导致飞轮在外径处发生爆破失效。缠绕过程中对纤维束施加预应力能提高飞轮的初始失效转速。在整个损伤过程中没有出现单元分层失效和剪切失效。

Based on three-dimensional （3D） progressive damage theory, a stiffness degradation method is proposed to predict the progressive failure properties of 3D composite flywheel rotor, and the correctness of this method is proved by comparing with existing references. Four failure modes are included, Fiber breakage, matrix cracking, delamination and fiber-matrix shear failure. The Newton-Rapson nonlinear iterative algorithm of finite method is developed to perform the 3D progressive failure analysis. The failure analysis and comparisons are all performed when winding prestress are different. The results show that the failure first appears at the middle of composite flywheel, and the failure process includes： Matrix cracking first, and with the rotating speed increasing, the fiber breakage causes the burst failure at the outer radius of the composite flywheel. Besides, the filament tension winding process can increase the initial failure speed of flywheel There is no delamination and shear failure in this process.