复合材料板弹簧渐进失效分析与极限载荷预报

摘要

基于复合材料细观力学Mori-Tanaka方法,使用Digimat软件预测纤维增强树脂基复合材料宏观弹性常数,建立复合材料细观和宏观力学响应间的耦合关系;考虑了复合材料的制造缺陷,采用逆向回归迭代法对基体材料的弹性常数进行修正;基于ABAQUS软件和Digimat软件耦合的计算平台,在复合材料板弹簧有限元模型中调用Mori-Tanaka细观本构模型,考虑复合材料的细观损伤,引入纤维和基体的失效准则进行宏细观耦合模型渐进失效的数值模拟,实现复合材料板弹簧的极限载荷预报,并通过复合材料板弹簧的极限载荷试验进行了验证.结果表明:复合材料板弹簧的试验断裂位置与模拟预测的断裂位置基本一致,极限载荷试验值与预测值的偏差为5.1％.%Based on micro-mechanics Mori-Tanaka method of composite,macroscopic elastic constants of composite predicted by Digimat software and the response coupling relationship between micro-and macromechanics for composite was established.Considering manufacturing defects of composite,the method of reverse regression iteration was employed to modify elastic constants of matrix material.Based on the computing platform coupled ABAQUS software with Digimat software,Mori-Tanaka micro-mechanics constitutive model was called in the finite element model of composite leaf spring and micro-mechanics damage of composite was considered,then the numerical simulation of macro-micro multiscale coupling progressive failure was implemented by introducing the fiber and matrix failure criteria which realized ultimate load prediction of composite leaf spring and was validated by ultimate load test of composite leaf spring.The results show that the test fracture location of composite leaf spring consistent with that of simulated prediction,and deviation between test and prediction values of ultimate load was only 5.1％.