Notch strengthening or weakening governed by transition of shear failure to normal mode fracture

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	Notch strengthening or weakening governed by transition of shear failure to normal mode fracture
	Lei, XQ; Li, CL; Shi XH(施兴华); Xu XH(许向红); Wei YJ(魏宇杰)
刊名	SCIENTIFIC REPORTS
	2015-05-29
通讯作者邮箱	yujie_wei@lnm.imech.ac.cn
卷号	5 页码:10537
ISSN号	2045-2322
通讯作者	Wei, YJ (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
产权排序	[Lei, Xianqi; Shi, Xinghua; Xu, Xianghong; Wei, Yujie] Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China; [Li, Congling] Luoyang Inst Sci & Technol, Sch Civil Engn, Luoyang 471023, Henan Province, Peoples R China
中文摘要	It is generally observed that the existence of geometrical discontinuity like notches in materials will lead to strength weakening, as a resultant of local stress concentration. By comparing the influence of notches to the strength of three typical materials, aluminum alloys with intermediate tensile ductility, metallic glasses with no tensile ductility, and brittle ceramics, we observed strengthening in aluminum alloys and metallic glasses: Tensile strength of the net section in circumferentially notched cylinders increases with the constraint quantified by the ratio of notch depth over notch root radius; in contrast, the ceramic exhibit notch weakening. The strengthening in the former two is due to resultant deformation transition: Shear failure occurs in intact samples while samples with deep notches break in normal mode fracture. No such deformation transition was observed in the ceramic, and stress concentration leads to its notch weakening. The experimental results are confirmed by theoretical analyses and numerical simulation. The results reported here suggest that the conventional criterion to use brittleness and/or ductility to differentiate notch strengthening or weakening is not physically sound. Notch strengthening or weakening relies on the existence of failure mode transition and materials exhibiting shear failure while subjected to tension will notch strengthen.
分类号	一类
类目[WOS]	Multidisciplinary Sciences
研究领域[WOS]	Science & Technology - Other Topics
收录类别	SCI
原文出处	http://dx.doi.org/10.1038/srep10537
语种	英语
WOS记录号	WOS:000355588300001
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/54962]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Lei, XQ,Li, CL,Shi XH,et al. Notch strengthening or weakening governed by transition of shear failure to normal mode fracture[J]. SCIENTIFIC REPORTS,2015,5:10537.
APA	Lei, XQ,Li, CL,施兴华,许向红,&魏宇杰.(2015).Notch strengthening or weakening governed by transition of shear failure to normal mode fracture.SCIENTIFIC REPORTS,5,10537.
MLA	Lei, XQ,et al."Notch strengthening or weakening governed by transition of shear failure to normal mode fracture".SCIENTIFIC REPORTS 5(2015):10537.