铝锂合金粘接接头CZM模型关键参数的确定（英文）

Determination of key parameters of Al–Li alloy adhesively bonded joints using cohesive zone model

单搭接胶接接头胶层的关键参数对于铝锂合金补片增强结构抑制裂纹扩展的能力具有重要的意义和影响。针对铝锂合金补片增强结构胶接接头,本文根据材料力学与断裂力学的理论推导了确定单搭接胶接接头胶层的关键参数的方法,并采用0厚度的内聚力模型(CZM)对这种单搭接胶接接头的胶层损伤演化过程进行模拟,设计了正交仿真试验进行有限元仿真模拟与试验对比,建立了铝锂合金补片增强结构单搭接胶接接头三维渐进损伤模型。模拟结果与试验结果吻合较好,表明这种胶层参数确定方法的正确性,验证了本文确定的内聚强度和断裂能这两个关键参数的正确性,并且证明了此内聚力模型可以很好地预测铝锂合金补片增强结构胶接接头的强度以及断裂失效过程,为铝锂合金补片增强结构抑制裂纹扩展的研究提供基础。

The key parameters of the adhesive layer of a reinforcing patch are of great significance and affect the ability to suppress crack propagation in an Al–Li alloy patch-reinforced structure.This paper proposes a method to determine the key parameters of the adhesive layer of adhesively bonded joints in the Al–Li alloy patch-reinforced structure.A zero-thickness cohesive zone model(CZM)was selected to simulate the adhesive layer’s fracture process,and an orthogonal simulation was designed to compare against the test results.A three-dimensional progressive damage model of an Al–Li alloy patch-reinforced structure with single-lap adhesively bonded joints was developed.The simulation’s results closely agree with the test results,demonstrating that this method of determining the key parameters is likely accurate.The results also verify the correctness of the cohesive strength and fracture energy,the two key parameters of the cohesive zone model.The model can accurately predict the strength and fracture process of adhesively bonded joints,and can be used in research to suppress crack propagation in Al–Li alloy patch-reinforced structures.