温度对钢/铝粘接接头失效强度影响的研究
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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。
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.
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.
引文
[1] 郭玉琴,朱新峰,杨艳,等.汽车轻量化材料及制造工艺研究现状[J].锻压技术,2015,40(3).
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[7] GRANT L D R, ADAMS R D, SILVA L F M D. Effect of the temperature on the strength of adhesively bonded single lap and T joints for the automotive industry[J]. International Journal of Adhesion & Adhesives,2009,29(5):535-542.
[8] BANEA M D, SILVA L F M D, CAMPILHO R D S G. Moulds design for adhesive bulk and joint specimens manufacturing[J]. Assembly Automation,2012,32(3):284-292.
[9] KOHLI D K. Improved 121°C curing epoxy film adhesive for composite bonding and repair applications: FM? 300-2 adhesive system[J]. International Journal of Adhesion & Adhesives,1999,19(2-3):231-242.
[10] 胡平,韩啸,李伟东.非平衡胶接接头极端温度环境强度退化研究[C].2012中国汽车轻量化技术研讨会,2012.
[11] ZHANG F, YANG X, WANG H P, et al. Durability of adhesively-bonded single lap-shear joints in accelerated hygrothermal exposure for automotive applications[J]. International Journal of Adhesion & Adhesives,2013,44(44):130-137.
[12] BANEA M D, SOUSA F S M D, SILVA L F M D, et al. Effects of temperature and loading rate on the mechanical properties of a high temperature epoxy adhesive[J]. Journal of Adhesion Science and Technology,2011,25(18):2461-2474.
[13] BANEA M D, SILVA L F M D. The effect of temperature on the mechanical properties of adhesives for the automotive industry[J]. Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design & Applications,2010,224(2):51-62.
[14] LEE M, YEO E, BLACKLOCK M, et al. Predicting the strength of adhesively bonded joints of variable thickness using a cohesive element approach[J]. International Journal of Adhesion & Adhesives,2015,58:44-52.
[2] 李桂华,熊飞,龙江启.车身材料轻量化及其新技术的应用[J].材料开发与应用,2009,24(2):87-93.
[3] 吉玲.钢铝异种金属连接方法现状分析[J].电焊机,2009,39(12):102-104.
[4] KOKINI K, SMITH C C. Interfacial transient thermal fracture of adhesively bonded dissimilar materials[J]. Experimental Mechanics,1989,29(3):312-317.
[5] MESCHUT G. Mechanical joining and adhesive bonding-joining processes with new challenges to materials testing[J]. Materialprufung,2002,44(7):287-294.
[6] SILVA L F M D, ADAMS R D. Measurement of the mechanical properties of structural adhesives in tension and shear over a wide range of temperatures[J]. Journal of Adhesion Science & Technology,2005,19(2):109-141.
[7] GRANT L D R, ADAMS R D, SILVA L F M D. Effect of the temperature on the strength of adhesively bonded single lap and T joints for the automotive industry[J]. International Journal of Adhesion & Adhesives,2009,29(5):535-542.
[8] BANEA M D, SILVA L F M D, CAMPILHO R D S G. Moulds design for adhesive bulk and joint specimens manufacturing[J]. Assembly Automation,2012,32(3):284-292.
[9] KOHLI D K. Improved 121°C curing epoxy film adhesive for composite bonding and repair applications: FM? 300-2 adhesive system[J]. International Journal of Adhesion & Adhesives,1999,19(2-3):231-242.
[10] 胡平,韩啸,李伟东.非平衡胶接接头极端温度环境强度退化研究[C].2012中国汽车轻量化技术研讨会,2012.
[11] ZHANG F, YANG X, WANG H P, et al. Durability of adhesively-bonded single lap-shear joints in accelerated hygrothermal exposure for automotive applications[J]. International Journal of Adhesion & Adhesives,2013,44(44):130-137.
[12] BANEA M D, SOUSA F S M D, SILVA L F M D, et al. Effects of temperature and loading rate on the mechanical properties of a high temperature epoxy adhesive[J]. Journal of Adhesion Science and Technology,2011,25(18):2461-2474.
[13] BANEA M D, SILVA L F M D. The effect of temperature on the mechanical properties of adhesives for the automotive industry[J]. Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design & Applications,2010,224(2):51-62.
[14] LEE M, YEO E, BLACKLOCK M, et al. Predicting the strength of adhesively bonded joints of variable thickness using a cohesive element approach[J]. International Journal of Adhesion & Adhesives,2015,58:44-52.