新型三线性本构内聚力模型的界面参数研究

复合材料多向层合板分层扩展行为的准确模拟对层板结构设计非常重要。笔者前期工作已经建立了一种基于失效机理的新型三线性本构内聚力模型来考虑纤维桥接对分层行为的影响。在此基础上,基于二维有限元模型对该新型内聚力本构中的关键参数开展了数值研究,获得了适用于复合材料多向层合板数值模拟的内聚力本构参数取值方案。最后采用确定的本构参数对复合材料多向层合板的分层扩展行为进行了模拟,所得模拟结果与试验结果之间的一致性较好,进而验证了所建立参数取值方案的有效性。

Studies on the critical interfacial parameters in a novel three-linear cohesive zone model

Accurate simulation of the delamination growth behavior in composite multidirectional laminates is important for the designs of composite structures. According to the failure mechanism of multidirectional laminates, a novel three-linear cohesive zone model has been established in our previous work, in order to include the influence of fiber bridging on the delamination growth behavior in simulation. Based on that, numerical researches on the critical parameters in the novel three-linear cohesive zone model are performed in this study using two-dimensional finite element method. A value scheme of the critical parameters suitable for the simulation on the delamination growth in composite multidirectional laminates is obtained. The simulated results using the value scheme have good agreements with the experimental results, validating its effectiveness in the novel three-linear cohesive zone model.