泡沫镍三明治结构压印接头力学性能及其断口分析
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摘要
为研究泡沫镍作为压印接头夹层的力学性能,选取AA5052铝合金板材以及1、1. 5、2 mm泡沫镍进行压印连接,利用电液伺服材料试验机对接头进行拉伸-剪切试验,采用扫描电子显微镜(SEM)对失效断口进行观察,对接头的失效模式、最大载荷以及能量吸收能力进行分析。结果表明,泡沫镍夹层三明治结构压印接头成形效果良好;夹层厚度对三明治结构压印接头宏观失效形式并无影响,均为颈部断裂;接头微观断口主要为韧性断裂;当夹层厚度为1. 5 mm时,接头的力学性能更加优异。
In order to study the mechanical properties of nickel foam as the interlayer of clinched joint,AA5052 sheets and nickel foam of 1,1.5,2 mm were prepared for clinched joints,and then tensile shear tests were carried out by using the electric servo-hydraulic material testing machine.The failure fracture surface was observed by scanning electron microscope( SEM).The failure mode,maximum strength and energy absorption capacity of clinched joints were analyzed.The results show that the molding effect of sandwich structure clinched joints embedded with nickel foam is good,and the thickness of the interlayer has no effect on the macroscopic failure mode of the sandwich structure clinched joints,and all of them are neck fracture; the micro-fracture of the joints is mainly ductile fracture; when the thickness of nickel foam is 1.5 mm,the mechanical properties of the joints are even better.
In order to study the mechanical properties of nickel foam as the interlayer of clinched joint,AA5052 sheets and nickel foam of 1,1.5,2 mm were prepared for clinched joints,and then tensile shear tests were carried out by using the electric servo-hydraulic material testing machine.The failure fracture surface was observed by scanning electron microscope( SEM).The failure mode,maximum strength and energy absorption capacity of clinched joints were analyzed.The results show that the molding effect of sandwich structure clinched joints embedded with nickel foam is good,and the thickness of the interlayer has no effect on the macroscopic failure mode of the sandwich structure clinched joints,and all of them are neck fracture; the micro-fracture of the joints is mainly ductile fracture; when the thickness of nickel foam is 1.5 mm,the mechanical properties of the joints are even better.
引文
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[2]HE X,GU F,BALL A. A review of numerical analysis of friction stir welding[J]. Progress in Materials Science,2014,65(10):1-66.
[3]HE X. Finite element analysis of laser welding:a state of art review[J]. Advanced Manufacturing Processes,2012,27(12):1354-1365.
[4] HE X, XING B, ZENG K, et al. Numerical and experimental investigations of self-piercing riveting[J].International Journal of Advanced Manufacturing Technology,2013,69(1-4):715-721.
[5]陈超,赵升吨,韩晓兰,等.轻质合金无铆塑性连接方式及其关键技术的探讨[J].锻压技术,2016,41(1):1-6.CHEN Chao, ZHAO Shengdun, HAN Xiaolan, et al.Discussion on mechanical clinching type and its key technology for fight-weight alloy[J]. Forging&Stamping Technology,2016,41(1):1-6.
[6]HE X C,ZHANG Y,XING B Y. Mechanical properties of extensible die clinched joints in titanium sheet materials[J].Materials and Design,2015,71:26-35.
[7] LAMBIASE F,DI ILIO A. An experimental study on clinched joints realized with different die[J]. Thin-walled Structures,2014,85:71-80.
[8]胡中芸,杨东辉,李军,等.泡沫铝的制备方法及其发展现状[J].热加工工艺,2014(12):24-28.HU Zhongyun, YANG Donghui, LI Jun, et al.Development status and preparation technology of aluminum foam[J]. Hot Working Technology,2014(12):24-28.
[9]张健,赵桂平,卢天健.梯度泡沫金属的冲击吸能特性[J].工程力学,2016,33(8):211-220.ZHANG Jian, ZHAO Guiping, LU Tianjian. Energy absorption behaviour of density-graded metallic foam[J].Engineering Mechanics,2016,33(8):211-220.
[10]黎花,高岩.泡沫金属材料阻尼性能的研究进展[J].材料导报,2016,30(1):88-95.LI Hua,GAO Yan. Research progress of the damping property of metal foams[J]. Materials Review,2016,30(1):88-95.
[11]王哲磊,王耀奇,侯红亮,等.气体捕捉法制备泡沫Ti-6Al-4V三明治结构与性能评价[J].材料导报,2016,30(10):91-94.WANG Zhelei, WANG Yaoqi, HOU Hongliang, et al.Preparation and property evaluation of Ti-6Al-4V foams sandwich structure using gas entrapment[J]. Materials Review,2016,30(10):91-94.
[12]余童欣,何晓聪,高爱凤,等.压印接头混合失效形式的静态失效机理分析[J].热加工工艺,2016(13):150-152.YU Tongxin,HE Xiaocong,GAO Aifeng,et al. Analysis on static mechanism of mixed failure mode of clinched joints[J]. Hot Working Technology, 2016(13):150-152.
[13]甘秋兰.泡沫金属的基本力学性质及本构关系[D].湘潭:湘潭大学,2004:17-21.GAN Qiulan. Essential mechanical properties and constitutive relation of metal foam[D]. Xiangtan:Xiangtan University,2004:17-21.
[14]钟群鹏,赵子华.断口学[M].北京:高等教育出版社,2006:131-208.ZHONG Qunpen, ZHAO Zihua. Hallography[M].Beijing:Higher Education Press,2006:131-208.