变刚度复合材料开孔板拉伸行为数值模拟及试验验证
Numerical simulation and experiment validation of variable stiffness composite laminates with open holes under unidirectional tension

纤维曲线铺放是提高复合材料构件力学性能的有效方法之一。本文针对复合材料开孔板铺放轨迹进行了研究，利用B样条曲线插值拟合获取了开孔板最大主应力铺放轨迹，并通过离散网格法建立了变刚度开孔板模型，通过引入Tsai-Wu损伤失效判据以及常刚度退化准则，进行了拉伸失效数值模拟及损伤失效分析，并分别铺放了两组常刚度和变刚度开孔板试验样件，进行了拉伸对比试验。结果表明：数值模拟与实验数据吻合较好，变刚度开孔板相比常刚度开孔板，拉伸强度提升了26.92%，且两者损伤失效演化过程显著不同。 Curvilinear fiber format is one of the effective ways to improve the mechanical properties of composite components.The laying trajectories of open-hole composite laminates were investigated. B-spline interpolation was used to obtain the laying trajectory of open-hole composite laminates with the maximum principal stress. The variable stiffness open-hole composite laminate model was established by discrete grid method.The tensile failure numerical simulation and damage failure analysis were carried out by Tsai-Wu damage failure criterion and constant stiffness degradation criterion. Two sets of constant stiffness and variable stiffness open-hole composite laminates experimental specimens were placed, respectively. A tensile strength experiment was performed.The results show that the numerical simulation accurately captures the data from experiment. The tensile strength of variable stiffness open-hole composite laminates, compared with constant stiffness open-hole composite laminates, increases by 26.92%, and the damage evolution processes of both are significantly different. 国家自然科学基金（51521064；51675479；11402228）；中央高校基本科研业务费专项资金（2017FZA4002）