Abstract The rapidly increasing use of structural adhesives, especially in the joining of automotive body structures has motivated various investigations of the effects of adhesive curing process on joints. The automotive-grade structural adhesives require heat curing, which, in the meantime, performs thermal loading on the substrates and causes undesirable effects in the joint. For example, the curing process results in complex residual stresses in the adhesive bond which are detrimental to the performance of the adhesive bond and thereby the automobile body structure, particularly the crashworthiness. To thoroughly evaluate such effects, this paper consists of two parts. The first part presents an innovative experimental method to characterize the thermal effects of the heat curing process on a multi-material single lap shear joint using digital image correlation. The second part of the study compares the performance of residual stress-induced joints against stress-free joints under tension loading at different strain rates. The proposed experimental method and the corresponding results from this study are expected to help comprehensively understand the adhesive joining process and its potential side effects on the automobile body structure.

中文翻译：

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捕获胶粘接头中固化诱导效应的实验方法

摘要 结构胶粘剂的使用迅速增加，特别是在汽车车身结构的连接中，引发了对胶粘剂固化过程对接头影响的各种研究。汽车级结构胶需要热固化，同时对基材施加热负荷，对接头产生不良影响。例如，固化过程会在粘合剂中产生复杂的残余应力，这对粘合剂的性能以及汽车车身结构，尤其是耐撞性都是有害的。为了彻底评估这种影响，本文由两部分组成。第一部分介绍了一种创新的实验方法，使用数字图像相关性来表征热固化过程对多材料单搭接剪切接头的热效应。研究的第二部分比较了在不同应变率的拉伸载荷下残余应力诱导接头与无应力接头的性能。所提出的实验方法和本研究的相应结果有望帮助全面了解粘合剂连接过程及其对汽车车身结构的潜在副作用。