CFRP与AA6022-T4铝合金的自冲铆接接头力学性能分析
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摘要
CFRP及铝合金的应用是实现车身轻量化的重要途径,自冲铆接工艺是车身制造中广泛应用的异种材料连接技术。基于CFRP和AA6022-T4铝合金的自冲铆接,首先针对试件搭接顺序对接头性能的影响进行对比分析,结果表明复合板在上层时的接头最大拉伸载荷比复合板在下层时高48%;然后针对复合板为上层试件的搭接顺序,研究了铆钉下压力对接头性能的影响,并从接头单向拉伸强度和接头断裂模式两个方面对不同铆钉下压力所得接头的载荷-位移曲线进行分析,揭示了铆钉下压力对接头性能的影响及机理,即下压力主要通过改变复合板的破坏程度及铆钉在下板的扩张量来影响接头的力学性能。
The application of carbon fiber reinforced polymer( CFRP) and aluminum alloy is an important way to realize the lightweight of automotive body,and the self-piecing riveting( SPR) technology is a widely used joining technology for heterogeneous materials in automotive industry. For the self-piecing riveting of CFRP and AA6022-T4 aluminum alloy,the influence of stacking sequence of specimen on the performance of SPR joint was analyzed first. And it is proved that the maximum tensile load of SPR joint for the composite plate in the upper layer is 48% higher than that of the composite plate in the lower layer. Then,for the stacking sequence of the composite plate in the upper layer,the influence of rivet pressure on the joint performance was investigated,and the load-displacement curves of the joint obtained by different rivet pressures were analyzed from two aspects of joint uniaxial tensile strength and joint fracture mode. Furthermore,the influence of rivet pressure on the joint performance and its mechanism were discovered,namely,the mechanical properties of joint were affected by changing the damage degree of composite plate and the expansion of rivet on the lower plate.
The application of carbon fiber reinforced polymer( CFRP) and aluminum alloy is an important way to realize the lightweight of automotive body,and the self-piecing riveting( SPR) technology is a widely used joining technology for heterogeneous materials in automotive industry. For the self-piecing riveting of CFRP and AA6022-T4 aluminum alloy,the influence of stacking sequence of specimen on the performance of SPR joint was analyzed first. And it is proved that the maximum tensile load of SPR joint for the composite plate in the upper layer is 48% higher than that of the composite plate in the lower layer. Then,for the stacking sequence of the composite plate in the upper layer,the influence of rivet pressure on the joint performance was investigated,and the load-displacement curves of the joint obtained by different rivet pressures were analyzed from two aspects of joint uniaxial tensile strength and joint fracture mode. Furthermore,the influence of rivet pressure on the joint performance and its mechanism were discovered,namely,the mechanical properties of joint were affected by changing the damage degree of composite plate and the expansion of rivet on the lower plate.
引文
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[10] Franco G D,Fratini L,Pasta A. Fatigue behaviour of self-piercing riveting of aluminium blanks and carbon fiber composite panels[J]. Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design&Applications,2012,226(3):230-241.
[11] Franco G D,Fratini L,Pasta A. Analysis of the mechanical performance of hybrid(SPR/bonded)single-lap joints between CFRP panels and aluminum blanks[J]. International Journal of Adhesion&Adhesives,2013,41(1):24-32.
[12] Gay A,Lefebvre F,Bergamo S,et al. Fatigue performance of a self-piercing rivet joint between aluminum and glass fiber reinforced thermoplastic composite[J]. International Journal of Fatigue,2016,83:127-134.
[13] Landgrebe D,Ja Ckel M,Niegsch R. Influence of process induced damages on joint strength when self-pierce riveting carbon fiber reinforced plastics with aluminum[J]. Key Engineering Materials,2015,651-653(1):1493-1498.
[14] Fratini L,Ruisi V F. Self-piercing riveting for aluminium alloyscomposites hybrid joints[J]. International Journal of Advanced Manufacturing Technology,2009,43(1-2):61.
[15] ASTM E8/E8M—2016a,Standard test methods for tension testing of metallic materials[S].
[2] Cotterill A,Blacket S E,Singh S. Improvements in or relating to self-piercing riveting[P]. UK,EP0675774,2004-05-12.
[3]邢保英,何晓聪,王玉奇,等.铝合金自冲铆接头静力学性能及失效机理分析[J].焊接学报,2015,36(9):47-50.Xing B Y,He X C,Wang Y Q,et al. Static mechanical properties and failure mechanism of self-piercing riveted aluminum alloy joint[J]. Transcations of the China Welding Institution,2015,36(9):47-50.
[4]赵伦,何晓聪,张先炼.钛合金自冲铆接头微动磨损机理及疲劳性能[J].焊接学报,2016,37(7):88-92.Zhao L,He X C,Zhang X L. Fretting wear mechanism and fatigue behavior of titanium alloy self-piercing riveted joint[J].Transcations of the China Welding Institution,2016,37(7):88-92.
[5]许竞楠,何晓聪,曾凯,等.自冲铆接头组织及性能分析[J].焊接学报,2014,35(7):91-95.Xu J N,He X C,Zeng K,et al. Effect of the technology characteristics of self-piercing riveting[J]. Transactions of the China Welding Institution,2014,35(7):91-95.
[6] Li D Z,Han L,Chrysanthou A,et al. The Effect of setting velocity on the static and fatigue strengths of self-piercing riveted joints for automotive applications[A]. TMS 2014 Annual Meeting Supplemental Proceedings[C]. Springer,2014.
[7] Han L,Thornton M,Li D Z,et al. Effect of setting velocity on self-piercing riveting process and joint behaviour for automotive applications[J]. Society of Automobile Engineers,2007,28(7):2024-2033.
[8] Fu M,Mallick P K. Fatigue of self-piercing riveted joints in aluminum alloy 6111[J]. International Journal of Fatigue,2003,25(3):183-189.
[9] Franco G D,Fratini L,Pasta A,et al. On the self-piercing riveting of aluminium blanks and carbon fiber composite panels[J]. International Journal of Material Forming,2010,3(1):1035-1038.
[10] Franco G D,Fratini L,Pasta A. Fatigue behaviour of self-piercing riveting of aluminium blanks and carbon fiber composite panels[J]. Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design&Applications,2012,226(3):230-241.
[11] Franco G D,Fratini L,Pasta A. Analysis of the mechanical performance of hybrid(SPR/bonded)single-lap joints between CFRP panels and aluminum blanks[J]. International Journal of Adhesion&Adhesives,2013,41(1):24-32.
[12] Gay A,Lefebvre F,Bergamo S,et al. Fatigue performance of a self-piercing rivet joint between aluminum and glass fiber reinforced thermoplastic composite[J]. International Journal of Fatigue,2016,83:127-134.
[13] Landgrebe D,Ja Ckel M,Niegsch R. Influence of process induced damages on joint strength when self-pierce riveting carbon fiber reinforced plastics with aluminum[J]. Key Engineering Materials,2015,651-653(1):1493-1498.
[14] Fratini L,Ruisi V F. Self-piercing riveting for aluminium alloyscomposites hybrid joints[J]. International Journal of Advanced Manufacturing Technology,2009,43(1-2):61.
[15] ASTM E8/E8M—2016a,Standard test methods for tension testing of metallic materials[S].