车身钢-铝粘接接头湿热老化性能

doi:10.13229/j.cnki.jdxbgxb20170903

摘要/Abstract

摘要：

为了给粘接技术在钢-铝车身中的实际应用提供参考依据和技术指导,研究了湿热环境对不同应力状态下钢-铝粘接接头性能的影响。针对所选取的单搭接、45°嵌接、对接钢-铝粘接接头,完成试件的加工及粘接固化,并根据所制定湿热循环谱,进行了20、40、60周期的湿热老化试验。试验结果表明:随着湿热循环周期的增加,3种接头失效载荷均呈下降趋势,在正、剪应力等比状态下,接头失效载荷下降幅度更显著。同时,在湿热循环作用下接头失效形式也发生了一定改变。通过计算接头胶层的正、剪应力值,并进行曲线拟合发现不同湿热循环周期后,接头失效准则均符合应力准则。在此基础上,进一步建立了钢-铝粘接接头在任意老化周期后的失效准则表达式及对应的三维曲面。

关键词: 车辆工程, 钢-铝车身, 粘接技术, 湿热老化, 应力状态, 失效准则

Abstract:

In order to provide reference and technical guidance for the practical application of adhesive technology in steel-aluminum body, the influence of hygrothermal environment on the performance of adhesive joints under different stress states is studied. The Single Lap Joints (SLJs), 45°Scarf Joints (SJs) and Butt Joints (BJs) are selected as the research objects. After the adhesion and curing of specimens, experiments of 20, 40 and 60 hygrothermal cycles are completed according to hygrothermal cycle spectrum. The results show that with the increase in hygrothermal cycles, the failure loads of three kinds of joint all decrease, and the SJs have the biggest decrease amplitude, namely the failure load decreases significantly under the combine stress of shear and normal. At the same time, the failure modes of the joints have also changed after the hygrothermal cycles. The normal stress and shear stress of the adhesive layers are calculated and the curves are fitted. The stress criterion is selected as appropriate expression of joint failure criterion after different hygrothermal cycles. Based on this, the failure criterion formula and 3D surface with different aging cycles of the joints are established.

Key words: vehicle engineering, steel-aluminum body, adhesive technology, hygrothermal aging, stress state, failure criterion

中图分类号:

U463.82

那景新,慕文龙,范以撒,谭伟,杨佳宙. 车身钢-铝粘接接头湿热老化性能[J]. 吉林大学学报(工学版), 2018, 48(6): 1653-1660.

NA Jing-xin,MU Wen-long,FAN Yi-sa,TAN Wei,YANG Jia-zhou. Effect of hygrothermal aging on steel-aluminum adhesive joints for automotive applications[J]. Journal of Jilin University(Engineering and Technology Edition), 2018, 48(6): 1653-1660.

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材料	弹性模量/MPa	泊松比	密度/(kg·m^-3)
ISR 7008	4.3	0.44	1400
6005A铝合金	71 000	0.33	2730
304不锈钢	193 000	0.3	7930