泡沫镍三明治结构自冲铆接头力学性能
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摘要
为探究三明治结构自冲铆接头的力学性能,以自冲铆连接设备对AA5052铝合金板料和泡沫镍夹层进行连接;通过拉伸-剪切试验研究接头的峰值载荷、最大位移及能量吸收能力,并分析接头的失效形式及宏观失效机理;此外,运用MATLAB对接头的峰值载荷和最大位移进行分析。结果表明,泡沫镍夹层有利于增大接头的钉脚张开度,并改善应力分布。泡沫镍夹层使接头静失效载荷增加了8.9%;随着泡沫镍夹层厚度的增加,三明治结构自冲铆接头的抗拉强度呈降低趋势,但接头的能量吸收值相对提高;AA5052铝合金三明治结构自冲铆接头的失效模式为铆钉脱离下板。
To investigate the mechanical properties of self-piercing riveted( SPR) joint taking nickel foam in as sandwich structure,AA5052 aluminum alloy sheets and nickel foam interlayer were joined by SPR equipment. Tensile-shear tests were carried out to study the peak loads and energy absorption properties of the joints,and failure modes as well as macroscopic failure mechanism about the joints were analyzed. Peak loads and maximum displacements of joints were investigated by MATLAB. The results indicate that it was beneficial to increase rivet flaring of the joints by using nickel foam interlayer,which also improved distribution of stress. Tensile strength of the joint increased by 8. 9% duo to application of nickel foam interlayer. With the increase of interlayer thickness,tensile strength of joint was in a decreasing trend; however,the energy absorption value was improved relatively. SPR joint taking nickel foam in as sandwich structure failed when the rivet was pulled out from the lower sheet.
To investigate the mechanical properties of self-piercing riveted( SPR) joint taking nickel foam in as sandwich structure,AA5052 aluminum alloy sheets and nickel foam interlayer were joined by SPR equipment. Tensile-shear tests were carried out to study the peak loads and energy absorption properties of the joints,and failure modes as well as macroscopic failure mechanism about the joints were analyzed. Peak loads and maximum displacements of joints were investigated by MATLAB. The results indicate that it was beneficial to increase rivet flaring of the joints by using nickel foam interlayer,which also improved distribution of stress. Tensile strength of the joint increased by 8. 9% duo to application of nickel foam interlayer. With the increase of interlayer thickness,tensile strength of joint was in a decreasing trend; however,the energy absorption value was improved relatively. SPR joint taking nickel foam in as sandwich structure failed when the rivet was pulled out from the lower sheet.
引文
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[2]陈一龙.汽车轻量化技术发展状况及展望[J].汽车工艺与材料,2012(1):1-4.
[3]邓正才.轻量化轿车用铝合金焊接工艺研究[D].上海:上海交通大学,2004.
[4]吴松,王敏,孔谅,等.5052铝合金电阻点焊裂纹产生机理及抑制[J].焊接学报,2014,35(9):92-96.
[5]王远,李永兵,金鑫,等.铝代钢对三层板接头力学性能影响规律研究[J].汽车工程学报,2013,3(5):324-331.
[6]邓成江,何晓聪,邢保英,等.基于3层板材搭接的自冲铆连接性能研究[J].机械设计,2015(6):83-87.
[7]HE X,ZHAO L,DENG C,et al.Self-piercing riveting of similar and dissimilar metal sheets of aluminum alloy and copper alloy[J].Materials&design,2015,65:923-933.
[8]HAN L,CHRYSANTHOU A,YOUNG K W.Mechanical behavior of self-piercing riveted multi-layer joints under different specimen configurations[J].Materials&design,2007,28(7):2024-2033.
[9]HIRSCH F,MLLER S,MACHENS M,et al.Simulation of self-piercing riveting processes in fiber reinforced polymers:Material modeling and parameter identification[J].Journal of materials processing technology,2017,241:164-177.
[10]AFZALI M,LEFEBVRE F,GAY A,et al.Fatigue of aluminum/glass fiber reinforced polymer composite assembly joined by self-piercing riveting[J].Procedia engineering,2015,133:501-507.
[11]何晓聪,何家宁,柯建宏,等.自冲铆接头的质量评价及强度可靠性预测[J].湖南大学学报,2010(12):1-4.
[12]甘秋兰.泡沫金属的基本力学性质及本构关系[D].湖南湘潭:湘潭大学,2004.
[13]HAQUE R,DURANDET Y.Strength prediction of selfpierce riveted joint in cross-tension and lap-shear[J].Materials&design,2016,108:666-678.
[14]邓成江,何晓聪,邢保英,等.基于试验的自冲铆接头失效机理分析[J].热加工工艺,2013,42(17):220-223.
[15]胡俊.承载式大客车正面碰撞驾驶员损伤及防护研究[D].长沙:湖南大学,2015.