真空辅助湿铺贴阶梯形挖补修理后层合板拉伸破坏模拟

Tensile Failure Simulation of Vacuum-Assisted Wet-Layup Stepped-Repaired Laminates

对玻璃纤维增强复合材料真空辅助湿铺贴阶梯形挖补修理后层合板建立了三维有限元模型,进行了拉伸破坏模拟。发展了考虑剪切非线性的复合材料各向异性连续损伤力学模型,用于模拟母板与补片复合材料单向带失效。采用基于双线性cohesive本构的接触分析模拟了真空辅助湿铺贴阶梯形挖补修理后形成无厚度二次固化界面。数值模拟结果与试验结果吻合较好表明所采用的模型能很好地预测整个修理结构的拉伸性能。最后,分析了整个拉伸过程中层合板斜接挖补修理结构的损伤破坏过程。

A 3-D finite element model of the glass fiber composite laminates is established using vacuum- assisted wet-layup stepped-repair, and the tensile failure process is simulated. The anisotropic continu- um damage mechanics model of lamina is developed considering the shear nonlinearity, and it is used to simulate the material failure of the parent and the patch laminates. The contact analysis is defined for the secondary curing interface between the motherboard and patch, using the cohesive model to achieve the interface contact properties. The test results are in good agreement with the numerical simulation results, and the model can be used to predict the tensile properties of the entire repaired structure. Fi- nally, the damage and failure process of the step-repaired structure is analyzed during stretching.