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材料导报  2018, Vol. 32 Issue (16): 2809-2815    https://doi.org/10.11896/j.issn.1005-023X.2018.16.020
  金属与金属基复合材料 |
粘接剂对1420铝锂合金压印接头疲劳性能的影响
雷蕾, 何晓聪, 高爱凤, 赵得锁
昆明理工大学机电工程学院,昆明 650500
Influence of Adhesive on Fatigue Property of 1420 Aluminum-Lithium Alloy Clinched Joint
LEI Lei, HE Xiaocong, GAO Aifeng, ZHAO Desuo
Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500
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摘要 压印连接以高效率、低能耗的优点在薄板材料连接中被广泛应用,但其连接强度相对较低,鉴于此,压印-粘接复合连接应运而生。本文以1420铝锂合金为原材料,制备了1420同种材料组合的压印接头及压印-粘接复合接头并进行对比。通过拉-剪静态力学试验测定两种接头的静力学强度及承载能力,通过拉-拉动态疲劳试验测定两种接头的动态疲劳性能,采用三参数法拟合疲劳寿命曲线,并对疲劳失效断口进行分析。结果表明:压-粘接头的静强度比压印接头提高了108.17%,接头承载能力提高169.63%。在短寿命区,两种接头均为颈部断裂失效;在中长疲劳寿命区,压-粘接头的疲劳寿命优于压印接头,压-粘接头疲劳断裂位置为压印点,压印接头疲劳断裂位置为下板。对疲劳断口进行SEM分析,发现两组疲劳断口均呈现韧性断裂与脆性断裂同时出现的特征。
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雷蕾
何晓聪
高爱凤
赵得锁
关键词:  1420铝锂合金  压印-粘接复合连接  疲劳试验  微观分析    
Abstract: Clinching is widely applied because of its high-efficiency and low-consumption. Clinch-bonded hybrid joining emerged to improve the strength of clinching joint. The specimens of 1420 aluminum-lithium alloy homogeneity clinched joints and clinch-bonded hybrid joints were prepared in this study. Static strength and bearing capacity of two kinds of joints were measured by static tensile shear test. Fatigue properties of them were measured by dynamic fatigue test and the fatigue life curve was fitted by three parameter method. The fatigue fracture were observed in scanning electron microscope to analysis fatigue failure mechanism and characterize mechanical properties of different joints. Results show the static strength of the clinch-bonded joint was increased by 108.17% and load capacity increased by 169.63% compared with the clinched joint. For fatigue properties of two kinds of joints, neck fracture was presented in the short fatigue life. However, the fatigue fracture were carried out in different location in the long fatigue life, the clinched joint in the lower plate and the clinch-bonded hybrid joint in the clinched joint, and the fatigue life of the clinch-bonded hybrid joint was better than that of the clinched joint. The SEM analysis of fatigue fracture showed that two groups joint presented the mixed characteristics of ductile fracture and brittle fracture.
Key words:  1420 aluminum-lithium alloy    clinch-bonded hybrid joining    fatigue test    microanalysis
               出版日期:  2018-08-25      发布日期:  2018-09-18
ZTFLH:  TG386.3+4  
基金资助: 国家自然科学基金(51565023;51565022);云南省教育厅科学研究基金重大专项项目(ZD201504)
通讯作者:  何晓聪:通信作者,男,1955年生,教授,博士,博士研究生导师,从事薄板材料连接新技术研究 E-mail:xiaocong_he@126.com   
作者简介:  雷蕾:女,1992年生,博士研究生,主要研究方向为薄板材料连接新技术 E-mail:15559873147@163.com
引用本文:    
雷蕾, 何晓聪, 高爱凤, 赵得锁. 粘接剂对1420铝锂合金压印接头疲劳性能的影响[J]. 材料导报, 2018, 32(16): 2809-2815.
LEI Lei, HE Xiaocong, GAO Aifeng, ZHAO Desuo. Influence of Adhesive on Fatigue Property of 1420 Aluminum-Lithium Alloy Clinched Joint. Materials Reports, 2018, 32(16): 2809-2815.
链接本文:  
http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2018.16.020  或          http://www.mater-rep.com/CN/Y2018/V32/I16/2809
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