连接条件对GFRTP自冲铆接性能影响的数值研究
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摘要
采用LS-DYNA软件建立玻璃纤维增强热塑性复合材料(GFRTP)的自冲铆接(SPR)有限元模型,对SPR过程进行数值模拟和实验验证。通过比较应力分布、钉腿张开度及接头强度,分析底座几何形状及铆钉材料对GFRTP工件SPR过程及接头强度的影响。研究结果表明:与金属SPR接头钉腿被下工件完全包裹而形成自锁结构不同,GFRTP工件SPR接头的形成机理是钉腿穿透下工件而向外翻卷,与钉头一起形成机械锁。连接条件对GFRTP工件SPR性能有显著影响。在一定范围内,增大底座凸台倾角有助于提高SPR的自锁性能;增加铆钉材料强度,可有效提升SPR接头的强度。
A finite element model of self-piercing riveting(SPR) of glass fiber reinforced thermoplastic(GFRTP) was developed based on LS-DYNA software. The SPR process was analyzed by numerical simulation and was validated by experiment. The effects of the die geometry and the strength of the rivet on the SPR performances of GFRTP workpieces were analyzed in terms of the stress distributions, the length of mechanical lock and the joint strength. The results show that the mechanism of SPR joint with GFRTP is different from that of metallic materials. The end of rivet leg for metallic workpieces is completely covered by the lower workpieces to form a self-locking structure; while for GFRTP workpieces the leg of rivet locks the workpieces together with the rivet head after it pierces through the workpieces and is warped outwards. The joining conditions have significant effects on the performances of SPR joints with GFRTP workpieces. Within a certain range, increasing the pip angle of die is useful for improving the self-locking performance of SPR joint, while increasing the strength of rivet can effectively improve the strength of SPR joint.
A finite element model of self-piercing riveting(SPR) of glass fiber reinforced thermoplastic(GFRTP) was developed based on LS-DYNA software. The SPR process was analyzed by numerical simulation and was validated by experiment. The effects of the die geometry and the strength of the rivet on the SPR performances of GFRTP workpieces were analyzed in terms of the stress distributions, the length of mechanical lock and the joint strength. The results show that the mechanism of SPR joint with GFRTP is different from that of metallic materials. The end of rivet leg for metallic workpieces is completely covered by the lower workpieces to form a self-locking structure; while for GFRTP workpieces the leg of rivet locks the workpieces together with the rivet head after it pierces through the workpieces and is warped outwards. The joining conditions have significant effects on the performances of SPR joints with GFRTP workpieces. Within a certain range, increasing the pip angle of die is useful for improving the self-locking performance of SPR joint, while increasing the strength of rivet can effectively improve the strength of SPR joint.
引文
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[20]申光,魏福安,喇培清,等.退火时间对微纳结构316L不锈钢组织和力学性能的影响[J].金属热处理,2016,41(12):122-126.SHEN Guang,WEI Fuan,LA Peiqing,et al.Effect of annealing time on microstructure and mechanical properties of 316Lstainless steel with micronano structure[J].Heat Treatment of Metals,2016,41(12):122-126.
[2]BERTIN L.Tensile strength of automotive aluminum joints using resistance spot welding,self-piercing riveting and adhesive hybrid joining[D].Windsor:University of Windsor,2014:105-112.
[3]ZHANG Jing,YANG Shanglu.Self-piercing riveting of aluminum alloy and thermoplastic composites[J].Journal of Composite Materials,2015,49(12):1493-1502.
[4]CHUNG C S,KIM H K.Fatigue strength of self-piercing riveted joints in lap-shear specimens of aluminium and steel sheets[J].Fatigue&Fracture of Engineering Materials&Structures,2016,39(9):1105-1114.
[5]KIM D,QIU Y,CHO H Y.Design of self-piercing rivet to joint in advanced high strength steel and aluminium alloy sheets[J].Chemometrics&Intelligent Laboratory Systems,2015,33(3):75-80.
[6]HIRSCH F,MüLLER S,MACHENS M,et al.Simulation of self-piercing riveting processes in fiber reinforced polymers:material modelling and parameter identification[J].Journal of Materials Processing Technology,2017,241(3):164-177.
[7]MARANNANO G,ZUCCARELLO B.Numerical experimental analysis of hybrid double lap aluminum-CFRP joints[J].Composites Part B:Engineering,2015,71(3):28-39.
[8]LI D,CHRYSANTHOU A,PATEL I,et al.Self-piercing riveting-a review[J].International Journal of Advanced Manufacturing Technology,2017,92(5/6/7/8):1777-1824.
[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,2013,6(1):137-144.
[10]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.
[11]HE Xiaocong,XING Baoying,ZENG Kai,et al.Numerical and experimental investigations of self-piercing riveting[J].International Journal of Advanced Manufacturing Technology,2013,69(1/2/3/4):715-721.
[12]MORAES J F C,JORDON J B.Numerical analysis of self-pierce riveting of magnesium alloys[C]//2013 International Mechanical Engineering Congress and Exposition.San Diego:ASME,2013:15-21.
[13]DENG Chengjiang,HE Xiaocong,XING Baoying.Aperformance study of self-piercing riveting of aluminum and copper alloy sheets[J].Advanced Materials Research,2013,734/735/736/737:2460-2464.
[14]MUCHA J.A study of quality parameters and behavior of self-piercing riveted aluminum sheets with different joining conditions[J].Journal of Mechanical Engineering,2011,57(4):323-333.
[15]XING Baoying,HE Xiaocong,TANG Yong,et al.Analysis on forming mechanism and static mechanics properties of self-piercing riveting[J].Materials Review,2013,36(2):139-142.
[16]HALLQUIST J O.Ls-dyna theory manual[R].Livermore,California,USA:Livermore Software Technology Corporation,2006:155-161.
[17]卢毅,何晓聪,张越,等.工业纯钛异种板材自冲铆连接及静态失效机理研究[J].热加工工艺,2015,43(13):30-34.LU Yi,HE Xiaocong ZHANG Yue,et al.Study on self-pierce riveting on dissimilar sheets about commercially pure titanium and static failure mechanism[J].Hot Working Technology,2015,44(13):30-34.
[18]朱秀云,潘蓉,林皋,等.基于ANSYS/LS-DYNA的钢板混凝土墙冲击实验的有限元分析[J].爆炸与冲击,2015,35(2):222-228.ZHU Xiuyun,PAN Rong,LIN Gao,et al.FEM analysis of impact experiments with steel plated concrete walls based on ANSYS/LS-DYNA[J].Journal of Central South University(Science and Technology),2015,35(2):222-228.
[19]雷拓,钱江,刘成清.基于精细有限元分析的既有RC框架结构破坏机理[J].中南大学学报(自然科学版),2014,45(1):214-222.LEI Tuo,QIAN Jiang,LIU Chengqing.Failure mechanism of an existing RC frame structure based on detailed finite element analysis[J].Journal of Central South University(Science and Technology),2014,45(1):214-222.
[20]申光,魏福安,喇培清,等.退火时间对微纳结构316L不锈钢组织和力学性能的影响[J].金属热处理,2016,41(12):122-126.SHEN Guang,WEI Fuan,LA Peiqing,et al.Effect of annealing time on microstructure and mechanical properties of 316Lstainless steel with micronano structure[J].Heat Treatment of Metals,2016,41(12):122-126.