Origin of anomalous inverse notch effect in bulk metallic glasses

IMR OpenIR

	Origin of anomalous inverse notch effect in bulk metallic glasses
	Pan, J.; Zhou, H. F.; Wang, Z. T.; Li, Y.; Gao, H. J.; liyi@imr.ac.cn; huajian_gao@brown.edu
	2015
发表期刊	JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
ISSN	0022-5096
卷号	84 页码:85-94
摘要	Understanding notch-related failure is crucial for the design of reliable engineering structures. However, substantial controversies exist in the literature on the notch effect in bulk metallic glasses (BMGs), and the underlying physical mechanism responsible for the apparent confusion is still poorly understood. Here we investigate the physical origin of an inverse notch effect in a Zr-based metallic glass, where the tensile strength of the material is dramatically enhanced, rather than decreased (as expected from the stress concentration point of view), by introduction of a notch. Our experiments and molecular dynamics simulations show that the seemingly anomalous inverse notch effect is in fact caused by a transition in failure mechanism from shear banding at the notch tip to cavitation and void coalescence. Based on our theoretical analysis, the transition occurs as the stress triaxiality in the notched sample exceeds a material-dependent threshold value. Our results fill the gap in the current understanding of BMG strength and failure mechanism by resolving the conflicts on notch effects and may inspire re-interpretation of previous reports on BMG fracture toughness where pre-existing notches were routinely adopted. (C) 2015 Elsevier Ltd. All rights reserved.
部门归属	[pan, j. ; li, y.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china ; [zhou, h. f. ; gao, h. j.] brown univ, sch engn, providence, ri 02912 usa ; [zhou, h. f.] tsinghua univ, dept engn mech, ctr adv mech & mat, aml, beijing 100084, peoples r china ; [wang, z. t. ; li, y.] natl univ singapore, dept mat sci & engn, singapore 117576, singapore
关键词	Bulk Metallic Glasses Notch Strength Shear Band Cavitation
资助者	National Nature Science Foundation of China [51401220, 51471165]; National Science Foundation [CMMI-1161749]; Center of Mechanics and Materials at Tsinghua University
收录类别	sci
语种	英语
WOS记录号	WOS:000364887400006
引用统计	被引频次：65[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/75041
专题	中国科学院金属研究所
通讯作者	liyi@imr.ac.cn; huajian_gao@brown.edu
推荐引用方式 GB/T 7714	Pan, J.,Zhou, H. F.,Wang, Z. T.,et al. Origin of anomalous inverse notch effect in bulk metallic glasses[J]. JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS,2015,84:85-94.
APA	Pan, J..,Zhou, H. F..,Wang, Z. T..,Li, Y..,Gao, H. J..,...&huajian_gao@brown.edu.(2015).Origin of anomalous inverse notch effect in bulk metallic glasses.JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS,84,85-94.
MLA	Pan, J.,et al."Origin of anomalous inverse notch effect in bulk metallic glasses".JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS 84(2015):85-94.