汽车工程

汽车工程 ›› 2019, Vol. 41 ›› Issue (2): 225-231.doi: 10.19562/j.chinasae.qcgc.2019.02.016

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温度对钢/铝粘接接头失效强度影响的研究*

那景新1, 浦磊鑫1, 秦国锋2, 陈立军3   

  1. 1.吉林大学,汽车仿真与控制国家重点实验室,长春 130022;
    2.广西师范大学职业技术师范学院,桂林 541004;
    3.吉林大学,大数据与网络管理中心,长春 130022
  • 收稿日期:2018-01-15 出版日期:2019-02-25 发布日期:2019-02-25
  • 通讯作者: 陈立军,副研究员,E-mail:clj@jlu.edu.cn
  • 基金资助:
    国家自然科学基金(51775230)资助

A Study on the Effects of Temperature on the Failure Strength of Steel-aluminum Adhesive Joints

Na Jingxin1, Pu Leixin1, Qin Guofeng2, Chen Lijun3   

  1. 1.Jilin University, State Key Laboratory of Automotive Simulation and Control, Changchun 130022;
    2.Teachers College for Vocational and Technical Education, Guangxi Normal University, Guilin 541004;
    3.Jilin University, Management Center of Big Data and Networking, Changchun 130022
  • Received:2018-01-15 Online:2019-02-25 Published:2019-02-25

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摘要： 为给钢/铝粘接结构在车辆中的实际应用提供参考和指导,本文中选取了3种处于不同应力状态下的接头,包括厚基底剪切接头、45°嵌接接头和对接接头,选取-40,-10,25,50和80℃ 5个温度点进行测试,以研究温度变化对Plexus MA832钢/铝粘接接头失效载荷、失效形式和失效准则的影响。研究结果表明:随着温度的升高,3种应力状态接头的失效强度均呈三次多项式的下降趋势,但下降幅度与接头的应力状态有关。其中,厚基底剪切接头的强度下降最为明显,80比25℃时下降约56%;但温度变化并未引起粘接接头失效形式的变化,均表现为内聚力破坏。此外,通过接头胶层应力曲线的拟合,建立了不同温度下Plexus MA832粘接胶层的二次应力失效准则,并在此基础上,最终建立了钢/铝粘接接头在任意温度下的失效准则表达式。

关键词: 钢/铝粘接, 接头失效, 温度, 失效预测, 失效准则

Abstract: In order to provide reference and guidance for the practical application of steel-aluminum adhesive structure to vehicle, three kinds of joints with different stress states are selected, i.e. thick base shear joint, 45° scarf joint and butt joint, for test under 5 different temperatures of -40,-10,25,50 and 80℃, to study the effects of temperature on the failure load, failure mode and failure criterion of plexus MA832 steel-aluminum adhesive joints. The results show that with the increase of temperature, the failure strength of three different joints all show a downward trend of cubic polynomial curve, but the descending amplitude is related to the stress state of the joints. Among them, the failure strength of thick base shear joint falls the most obviously, when temperature rises from 25 to 80℃ its failure strength drops by about 56%, but the rise of temperature does not change the failure mode of adhesive joints, which is characterized by cohesive failure. In addition, through the fitting of adhesive layer stress curve, the quadratic stress failure criterion of Plexus MA832 adhesive layer at different temperatures is established, and based on which the failure criterion expression of steel-aluminum adhesive joints at any temperature is given in the end

Key words: steel-aluminum adhesion, joint failure, temperature, failure prediction, failure criteria