基于CDM的复合材料缺口强度三维数值仿真模型

层合板受载时在缺口尖端出现的沿纤维方向的基体开裂会使缺口钝化,降低缺口带来的应力集中影响。为了更好地模拟这一现象,建立基于CDM的三维有限元模型,提出一种可以实现层合板中每层网格不同排列的建模方法,使网格边缘与每层纤维方向一致;为了实现每层网格不同的排列,在层间建立内聚力接触模拟分层损伤;对纤维增强复合材料层合板0/902/0]S和0/90/±45]S进行开孔拉伸的渐进损伤分析。结果表明:该模型可以模拟不同材料体系和铺层参数的层合板在拉伸载荷作用下的渐进损伤过程,预测其破坏强度;通过已知的试验结果对模型进行验证,证明了该方法的正确性且预测精度较高。

Three-dimensional Numerical Model for The Notched Strength of Composite Laminates Based on CDM

The matrix cracking along the fiber direction may take place at a tensile load near the hole edge.The matrix cracking can blunt the hole and alleviate the stress concentration. In order to accurately simulate this phenomenon,a three-dimensional finite element model was established based on CDM.A modeling method for different arrangement of grid in laminate was proposed.Surface-based cohesive contacts was established to simulate the inter-ply delamination characteristic.Simulate the open-hole tensile damage of composite laminates with stacking sequences of 0/902/0]S and 0/90/-45]S.The results indicate that the progressive damage process and ultimate tensile strength of the composite laminates with different material system and layer parameters at tensile load could be predicted by this model,The prediction accuracy of this method was satisfactory by comparison with known experimental data in literatures,which was proved the analysis method was valid..