Effect of loading methods on the fatigue properties of dissimilar al/steel keyhole-free FSSW joints | |
Zhang, Zhongke1; Yu, Yang2; Zhao, Huaxia3; Tong, Hui4 | |
刊名 | Materials |
2020-10-01 | |
卷号 | 13期号:19 |
关键词 | Fracture Friction stir welding Spot welding Stress analysis Welds Absorption energies Ductile and brittle fractures Fatigue properties Fatigue striations Fracture mechanisms Friction stir spot welding Loading frequencies Spot-welded joints |
DOI | 10.3390/MA13194247 |
英文摘要 | The energy evolution, fatigue life and failure behaviour of dissimilar Al/steel keyhole-free Friction stir spot welding (FSSW) joints were studied under different fatigue loads. The absorption energy of fatigue fracture, the fracture mechanism and the sensitivity of the fatigue limits to the fatigue load parameters were analysed. It was found that the stress ratio R determines the fatigue limit Ff, while the fatigue limit Ff is not sensitive to the loading frequency. The high-frequency fatigue load will increase the displacement deformation μ and fatigue fracture absorption energy Ea of the spot-welded joint, which are larger under asymmetric fatigue loading than those under symmetrical fatigue loading. At the same time, the symmetrical fatigue load can form the steady-state hysteresis loop, while asymmetric fatigue loading cannot, but asymmetric fatigue loading exhibits the displacement increment of fatigue softening. The fracture failure of spot-welded joints is a multiple crack source and the mixed-mode of ductile and brittle fracture mechanism, which exhibits typical fatigue striations in the fatigue fractures. © 2020 by the authors. |
WOS研究方向 | Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering ; Physics |
语种 | 英语 |
出版者 | MDPI AG |
WOS记录号 | WOS:000587211000001 |
内容类型 | 期刊论文 |
源URL | [http://ir.lut.edu.cn/handle/2XXMBERH/115792] |
专题 | 材料科学与工程学院 土木工程学院 |
作者单位 | 1.School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; 2.School of Materials Science and Engineering, Tongji University, Shanghai; 201804, China; 3.Aeronautical Key Laboratory for Welding and Joining Technologies, AVIC Manufacturing Technology Institute AECC, Beijing; 100024, China; 4.SAIC MOTOR Commercial Vehicle Technical Center, Body Department, Shanghai; 200090, China |
推荐引用方式 GB/T 7714 | Zhang, Zhongke,Yu, Yang,Zhao, Huaxia,et al. Effect of loading methods on the fatigue properties of dissimilar al/steel keyhole-free FSSW joints[J]. Materials,2020,13(19). |
APA | Zhang, Zhongke,Yu, Yang,Zhao, Huaxia,&Tong, Hui.(2020).Effect of loading methods on the fatigue properties of dissimilar al/steel keyhole-free FSSW joints.Materials,13(19). |
MLA | Zhang, Zhongke,et al."Effect of loading methods on the fatigue properties of dissimilar al/steel keyhole-free FSSW joints".Materials 13.19(2020). |
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