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High-cycle fatigue and fracture behavior of double-side friction stir welded 6082Al ultra-thick plates
Yang, C.1,2; Wang, B. B.1; Yu, B. H.1; Wu, L. H.1; Xue, P.1; Zhang, X. M.3; He, G. Z.3; Ni, D. R.1; Xiao, B. L.1; Wang, K. S.4; Ma, Z. Y.1
Corresponding AuthorXue, P.(pxue@imr.ac.cn) ; Ni, D. R.(drni@imr.ac.cn)
2020-03-01
Source PublicationENGINEERING FRACTURE MECHANICS
ISSN0013-7944
Volume226Pages:11
AbstractFor welded structures of precipitation-strengthened aluminum alloys, achieving sound joint with good fatigue property is not an easy task, especially for thick plates. In the present work, ultra-thick 6082Al-T4 alloy plates with 80 mm in thickness were double-side friction stir welded and heat-treated. The high cycle fatigue (HCF) property and fracture behavior of the joint were investigated using trisection specimens in thickness, and the key factors that affect the fracture behavior were addressed. High quality joint was achieved with the three-layered specimens fractured along the lowest hardness zone (LHZ) in the static tensile testing. Further, the fatigue life curves exhibited almost the same distribution tendency, and the same fatigue limit (110 MPa) and fatigue ratio (0.49) were achieved in the three-layered specimens. During fatigue testing, the middle and lower layers fractured along the LHZ, which was similar to those during the static tensile tests, while abnormal fracture occurred in the nugget zone (NZ) of the upper specimen. Further examination revealed that the residual stress in the NZ of the upper layer was tensile stress (+9 MPa) whereas it was compressive stress in the lower layer (-31 MPa). The tensile residual stress together with the external loaded cyclic tensile stress resulted in more serious fatigue damage in the upper layer and led to the abnormal fracture in the NZ.
KeywordUltra-thick aluminum alloy plate Double-side friction stir welding High-cycle fatigue Microstructure, mechanical properties Residual stress
Funding OrganizationYouth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China
DOI10.1016/j.engfracmech.2020.106887
Indexed BySCI
Language英语
Funding ProjectYouth Innovation Promotion Association of the Chinese Academy of Sciences[2017236] ; National Natural Science Foundation of China[U1760201]
WOS Research AreaMechanics
WOS SubjectMechanics
WOS IDWOS:000509727900016
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/137289
Collection中国科学院金属研究所
Corresponding AuthorXue, P.; Ni, D. R.
Affiliation1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China
3.CRRC Changchun Railway Vehicles Co Ltd, Changchun 130062, Peoples R China
4.Xian Univ Architecture & Technol, Sch Met Engn, Xian 710055, Peoples R China
Recommended Citation
GB/T 7714
Yang, C.,Wang, B. B.,Yu, B. H.,et al. High-cycle fatigue and fracture behavior of double-side friction stir welded 6082Al ultra-thick plates[J]. ENGINEERING FRACTURE MECHANICS,2020,226:11.
APA Yang, C..,Wang, B. B..,Yu, B. H..,Wu, L. H..,Xue, P..,...&Ma, Z. Y..(2020).High-cycle fatigue and fracture behavior of double-side friction stir welded 6082Al ultra-thick plates.ENGINEERING FRACTURE MECHANICS,226,11.
MLA Yang, C.,et al."High-cycle fatigue and fracture behavior of double-side friction stir welded 6082Al ultra-thick plates".ENGINEERING FRACTURE MECHANICS 226(2020):11.
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