颗粒增强粘接接头的工艺参数优化及失效分析

基于正交试验法,开展氧化铝颗粒增强粘接研究,分析胶层厚度、颗粒粒径和颗粒质量分数对接头质量的影响规律,得出接头最优工艺参数。通过观察粘接层断口形貌和建立单颗粒增强粘接层的有限元模型分析粘接层断裂失效过程。结果表明:3因素中对接头力学性能影响最显著的是胶层厚度,接头最优参数是胶层厚度为0.5 mm、颗粒粒径为0.1mm、颗粒质量分数为10%;氧化铝颗粒使颗粒周边先出现裂纹,并在颗粒间延伸,提高粘接层的失效断裂能,可增强接头力学性能。

Process parameter optimization and failure analysis of particles reinforced bonding joints

Based on the orthogonal experimental design method,the experimental research of alumina particles reinforced bonding was carried out,the effect laws of thickness of adhesive layer,particle size and particle mass fraction on the quality of the joints were analyzed,and the optimal process parameters of joints were obtained. The fracture morphology of the joints was observed and the finite element model of the particles reinforced bonding joints was established to identify the influence mechanism of particle on joints failure. The results show that among three factors,the thickness of adhesive layer has the most significant effect on the mechanical properties of joints. The optimal parameters of joints are as follows:The thickness of the adhesive layer is 0.5 mm,the particle size is 0.1 mm and the particle mass fraction is 10%. The addition of alumina particles makes the cracks firsly appear around the particles,which increases the crack length and the failure fracture energy of adhesive layer,thus enhancing the mechanical properties of joints.