单向纤维增强聚合物复合材料压缩渐进破坏单向纤维增强聚合物复合材料压缩渐进破坏

复合材料结构在承压时破坏如何演化，是其强度破坏分析的基础和核心任务。本文提出了基于连续介质损伤力学（CDM）的单向纤维增强聚合物复合材料压缩破坏渐进损伤分析（PDA）模型。建模中考虑了材料非线性行为、失效判断及损伤演化中材料性能退化等基本问题，分别对应于拉压不对称弹塑性本构关系、Puck准则、LaRC05准则及考虑破坏面方向的刚度退化方法。该模型通过用户材料子程序接口VUMAT引入到有限元软件ABAQUS中实现了有限元求解。对文献中提供的纵向、横向及偏轴压缩案例进行了数值计算并与试验数据对比。数值分析结果与试验数据吻合较好，证明了该方法的合理性和有效性，对开展多向层合板压缩破坏分析富有参考价值。 

Compression progressive failure of unidirectional fiber reinforced polymer composites

Failure evolution in composite structures under compression is a fundamental topic and plays a key role in the strength prediction of composites. Herein, a progressive damage analysis (PDA) model based on continuum damage mechanics (CDM) was proposed to analyze the compression failure of unidirectional fiber reinforced polymer composites. Some essential issues such as the nonlinear behavior of composites, failure judgement, and the degradation of material properties during damage evolution were considered, corresponding respectively to the tension-compression asymmetric elasto-plastic constitutive model, Puck criteria, LaRC05 criteria and a stiffness degradation model considering the direction of fracture plane. The proposed PDA model was implemented in finite element analysis (FEA) by using the interface of user defined materials subroutine (VUMAT) provided by ABAQUS. The result of FEA is in good agreement with the experiment data reported by literatures in the cases of longitudinal, transverse and off-axis compression, which proves the reasonability and effectiveness of this PDA model. This work is of great reference value for compression failure analysis of multidirectional laminates.