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Understanding the tensile fracture of deeply-notched metallic glasses
Yang, Guannan; Qu, Ruitao; Xu, Guangdong; Li, Quanzhen; Cui, Chengqiang; Zhang, Zhefeng
2020-12-15
Source PublicationINTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
Volume207Pages:70-81
AbstractDeeply-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.
DOI10.1016/j.ijsolstr.2020.10.004
WOS IDWOS:000591771900006
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/82298
Collection中国科学院金属研究所
Recommended Citation
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.
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