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Defect induced cracking and modeling of fatigue strength for an additively manufactured Ti-6Al-4V alloy in very high cycle fatigue regime

文献类型：期刊论文

作者Chi, Weiqian4; Wang, Wenjing4; Li, Ying3; Xu, Wei3; Sun, Chengqi1,2; Sun CQ(孙成奇)
刊名THEORETICAL AND APPLIED FRACTURE MECHANICS
出版日期2022-06-01
卷号119页码:10
ISSN号0167-8442
关键词Very high cycle fatigue Additively manufactured titanium alloy Defect Fatigue strength modeling
DOI10.1016/j.tafmec.2022.103380
通讯作者Wang, Wenjing(wjwang@bjtu.edu.cn) ; Sun, Chengqi(scq@lnm.imech.ac.cn)
英文摘要Additively manufactured (AM) alloy usually inevitably contains defects during the manufacturing process or in service. Defect, as a harmful factor, could significantly reduce the fatigue performance of materials. This paper shows that the location and introduced form of defects play an important role in high cycle fatigue and very high cycle fatigue (VHCF) behavior of selective laser melting Ti-6Al-4V alloys. The S-N curve descends approximately linearly for internal defect induced failure. While for artificial surface defect induced failure, the S-N curve descends at first and then exhibits a plateau region feature. The competition of interior crack initiation with fine granular area feature is also observed in VHCF regime. The paper indicates that only the size or the stress in-tensity factor range of the defect is not an appropriate parameter for describing the effect of defect on fatigue crack initiation. Finally, the effect of artificial surface defect on high cycle fatigue and VHCF strength is modeled,& nbsp;i.e., the fatigue strength sigma, fatigue life N and defect size & nbsp;(sic)area(square(root of the projection area of defect & nbsp;& nbsp;perpendicular to principal stress direction) is expressed as sigma = {CNa((sic)area)(n,& nbsp;)& nbsp;N < N0 & nbsp;CN0a((sic)area)(n,& nbsp;)& nbsp;N >= N-0 & nbsp;& nbsp;where C, a and n are constants, and N-0 is the number of cycles at the knee point of the curve.
WOS关键词DIRECT LASER DEPOSITION ; MECHANICAL-BEHAVIOR ; SURFACE-ROUGHNESS ; PERFORMANCE ; LIFE ; INITIATION ; PREDICTION ; INCLUSION ; ELECTRON ; GROWTH
资助项目National Natural Sci-ence Foundation of China[91860112] ; National Natural Sci-ence Foundation of China[52075032] ; Science and Technology Research and Development Program of China State Railway Group Co., Ltd.[P2020J024]
WOS研究方向Engineering ; Mechanics
语种英语
WOS记录号WOS:000798924600002
资助机构National Natural Sci-ence Foundation of China ; Science and Technology Research and Development Program of China State Railway Group Co., Ltd.
源URL[http://dspace.imech.ac.cn/handle/311007/89474]  
专题力学研究所_非线性力学国家重点实验室
通讯作者Wang, Wenjing; Sun, Chengqi
作者单位1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
2.Inst Mech, Chinese Acad Sci, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
3.Beijing Inst Aeronaut Mat, Aviat Key Lab Sci & Technol Aeronaut Mat Testing &, Beijing Key Lab Aeronaut Mat Testing & Evaluat, Beijing 100095, Peoples R China
4.Beijing Jiaotong Univ, Key Lab Vehicle Adv Mfg, Measuring & Control Technol, Minist Educ, Beijing 100044, Peoples R China
推荐引用方式
GB/T 7714		 Chi, Weiqian,Wang, Wenjing,Li, Ying,et al. Defect induced cracking and modeling of fatigue strength for an additively manufactured Ti-6Al-4V alloy in very high cycle fatigue regime[J]. THEORETICAL AND APPLIED FRACTURE MECHANICS,2022,119:10.
APA Chi, Weiqian,Wang, Wenjing,Li, Ying,Xu, Wei,Sun, Chengqi,&孙成奇.(2022).Defect induced cracking and modeling of fatigue strength for an additively manufactured Ti-6Al-4V alloy in very high cycle fatigue regime.THEORETICAL AND APPLIED FRACTURE MECHANICS,119,10.
MLA Chi, Weiqian,et al."Defect induced cracking and modeling of fatigue strength for an additively manufactured Ti-6Al-4V alloy in very high cycle fatigue regime".THEORETICAL AND APPLIED FRACTURE MECHANICS 119(2022):10.

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来源：力学研究所

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