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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、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。
Fiber curve laying is to improve the mechanical properties of composite materials, one of the effective methods. In this paper, the laying trajectory of perforated plate with composite material was studied. The trajectory of maximum principal stress of the perforated plate was obtained by B-spline curve interpolation fitting and the variable rigidity perforated plate model was established by discrete grid method. Tsai-Wu damage failure criterion and the criterion of constant stiffness, the numerical simulation of tensile failure and damage failure analysis were carried out. Two sets of test specimens of constant stiffness and variable rigidity were made and the tensile comparison test . The results show that the numerical simulation is in good agreement with the experimental data. Compared with the constant rigidity perforated plate, the tensile strength increases by 26.92% and the evolution process of damage failure is significantly different.