In this study, we explored the effects of different softening laws on the modelling of progressive damage in unidirectional composites materials using a 2D lattice model. The lattice model was based on axial springs that accounted for nearest-neighbour interactions. We considered linear and exponential softening laws and assessed their influence on the dynamic fracture response of unidirectional composite materials using two numerical examples. In order to overcome one of the drawbacks inherent to lattice models, i.e., the dependence on lattice cell size, we modified the material constitutive law by introducing a characteristic length parameter. The results obtained are also compared with experimental data reported by other researchers.

在这项研究中，我们探索了不同软化规律对使用2D晶格模型的单向复合材料中渐进式损伤建模的影响。晶格模型基于轴向弹簧，该弹簧考虑了最近邻的相互作用。我们考虑了线性和指数软化定律，并使用两个数值示例评估了它们对单向复合材料动态断裂响应的影响。为了克服晶格模型固有的缺点之一，即对晶格尺寸的依赖性，我们通过引入特征长度参数来修改材料的本构定律。还将获得的结果与其他研究人员报告的实验数据进行比较。