热-力载荷下复合材料/金属双面胶接接头界面力学模型

STRESS ANALYSIS OF COMPOSITE /METAL DOUBLE-SIDED BONDED JOINTS UNDER THERMO-MECHANICAL LOADS

在温度和静拉伸载荷共同作用下,考虑胶层的材料非线性,建立了复合材料/金属双面胶接接头界面的力学分析模型,推导出弹性响应和塑性响应下胶层剪应力的分段表达式,使用胶层最大剪应变失效准则计算出胶层主导破坏的结构极限载荷,并与有限元数值结果进行对比和验证。分析表明,双面胶接接头应力分析理论模型与相关简化假设正确、合理。在此基础上,研究了复合材料/金属双面胶接接头在热-力载荷下的胶层剪应力分布特点、破坏模式和失效机理,为胶接结构的承载能力分析及结构改进设计提供理论依据。

A stress analysis model involving adhesive material nonlinearity under thermo-mechanical loading condition is developed to characterize adhesive stress distribution of composite/metal double-sided adhesively bonded joints. The maximum strain criterion is used to predict the initial faihlre of the adhesive based on the failure mode. The finite element analysis is conducted to validate the present closed-form solutions. The numerical results indicate that the analytical solutions and their simplifications correlate well with the nonlinear finite element computations. The present mathematical techniques and analysis approaches are critical to the successful design, analysis and implementation of bonded repairs.