Understanding the tensile fracture of deeply-notched metallic glasses

doi:10.1016/j.ijsolstr.2020.10.004

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	Understanding the tensile fracture of deeply-notched metallic glasses
	Yang, Guannan 2; Qu, Ruitao 1; Xu, Guangdong 2; Li, Quanzhen 2; Cui, Chengqiang 2; Zhang, Zhefeng 1
刊名	INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
	2020-12-15
卷号	207 页码:70-81
关键词	Metallic glasses Deep notch Shear band Ellipse criterion Fracture
ISSN号	0020-7683
DOI	10.1016/j.ijsolstr.2020.10.004
通讯作者	Cui, Chengqiang(cqcui@gdut.edu.cn) ; Zhang, Zhefeng(zhfzhang@imr.ac.cn)
英文摘要	Deeply-notched metallic glasses can achieve significantly enhanced nominal tensile strain and strength under tension, and show the characteristics of dimples and "cup-and-cone" morphology on the fractographs. It has been expected that this deep-notch enhancement effect is resulted from the suppressed shear banding. In this study, we provided another interpretation for this effect through stress/strain field analyses based on the ellipse criterion. The results revealed the existence of relatively low but highly dispersed stress/strain instead of highly enhanced and localized stress/strain in deeply-notched metallic glasses, and therefore the actual stress is much lower than the nominal value. Owing to the positive third principal stress condition, the failure angle predicted by the ellipse criterion shifted from 45 degrees at the edge of the notch to 90 degrees at the center of the specimen, which was consistent with the "cup-and-cone" fracture morphology. These findings clarify the very high nominal stress/strain and special fracture process in deeply-notched metallic glasses. Our work provides a useful method to predict the shear-to-tensile failure mode transition of metallic glasses under complex loading conditions. (C) 2020 Published by Elsevier Ltd.
资助项目	National Natural Science Foundation of China[61874155] ; National Natural Science Foundation of China[51771205] ; Fostering Talents Foundation of Guangdong University of Technology[262511006]
WOS研究方向	Mechanics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000591771900006
资助机构	National Natural Science Foundation of China ; Fostering Talents Foundation of Guangdong University of Technology
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/141377]
专题	金属研究所_中国科学院金属研究所
通讯作者	Cui, Chengqiang; Zhang, Zhefeng
作者单位	1.Chinese Acad Sci, Inst Met Res, Lab Fatigue & Fracture Mat, Shenyang 110016, Peoples R China 2.Guangdong Univ Technol, State Key Lab Precis Elect Mfg Technol & Equipmen, Guangzhou 510006, Peoples R China
推荐引用方式 GB/T 7714	Yang, Guannan,Qu, Ruitao,Xu, Guangdong,et al. Understanding the tensile fracture of deeply-notched metallic glasses[J]. INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES,2020,207:70-81.
APA	Yang, Guannan,Qu, Ruitao,Xu, Guangdong,Li, Quanzhen,Cui, Chengqiang,&Zhang, Zhefeng.(2020).Understanding the tensile fracture of deeply-notched metallic glasses.INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES,207,70-81.
MLA	Yang, Guannan,et al."Understanding the tensile fracture of deeply-notched metallic glasses".INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES 207(2020):70-81.