胶层网格尺寸与性能参数相关性的反演研究

在使用内聚力模型对复合材料胶层进行有限元失效分析时，为了保证计算结果的准确性和收敛性，胶层网格尺寸应小于1 mm。然而当使用内聚力模型对飞机上的大型复合材料结构进行有限元分析时，模型将会产生上百万的有限元单元，这将耗费大量的计算资源。本文在研究胶层参数对胶层失效分析影响的基础上，通过对不同网格尺寸下胶层参数进行反演，提出了一种修改胶层参数的方法以适用于不同网格尺寸下胶层失效分析。使用此方法对不同网格尺寸的混合型弯曲(MMB)有限元模型和复合材料圆壳模型进行了有限元仿真。结果表明:所提出的方法能够大幅降低模型的网格数量，减小计算规模，快速准确地计算出混合加载条件下胶层损伤演化和破坏情况。 

Inversion study on the correlation between the mesh size and the adhesive properties

In order to ensure the accuracy and convergence of the calculation results, the mesh size of the adhesive layer should be less than 1 mm for the failure analysis of composite adhesive layer using the cohesive zone model. However, when the cohesive zone model is used to analysis a large composite material structure in the aircraft, the model will generate millions of finite elements, which will consume numerous computing resources. Based on the research of the influence of the adhesive properties on the adhesive layer failure analysis, by inversion of the adhesive properties with different mesh sizes, the method that can accurately describe the failure behavior of the adhesive layer by changing the parameters of the adhesive layer to adapt to different mesh sizes was proposed. This method was used to simulate the mixed-mode-bending (MMB) model and composite cylindrical shell model with different mesh sizes. The results show that the method proposed can greatly reduce the number of meshes in the model and the calculation scale, and quickly and accurately calculate the damage evolution and failure of the adhesive layer under mixed loading conditions.