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中文摘要：
随着汽车轻量化技术的发展,结构胶接技术被广泛应用于车身异种材料的连接工序。通过实验室模拟汽车服役工况的循环温度场环境,采用韧脆性质不同的两种结构胶粘剂,对钢/铝非平衡胶接接头的剪切强度进行环境退化研究。试验结果表明,两种胶接接头在循环温度场作用下,接头的宏观强度表现出不同程度的退化现象,并且随着时间的推移,这种退化趋势逐渐趋于稳定;通过ABAQUS有限元软件对胶接接头进行二维建模分析,并且通过内聚力单元对胶层的破坏过程进行模拟,发现在经历循环温度环境作用后,胶接区域边缘处胶层内部剥离应力和切应力的集中现象更加显著;采用扫描电镜法对胶层失效表面进行样貌分析,发现破坏表面胶体的微观结构也受到了环境变化的影响。
英文摘要：
With the development of automobile lightweight technology,the structural adhesion technique is being widely adopted in the connecting process of dissimilar materials in vehicle body.An experimental-numerical approach is developed to investigate the influence of cyclic-temperature environment on adhesive joints.The finite element model is set up to evaluate the degradation process in the adhesive joints through ABAQUS software and the peel and shear stress states in the adhesive layer are analyzed through cohesive zone modeling.Carefully designed experiment is carried out to validate the simulation results and help the numerical procedure to predict joint mechanical behavior after environmental exposure.The scanning electron microscopy is performed on the failure surface to investigate the micro fracture mechanisms in the adhesive layer.
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