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Title: Notch strengthening or weakening governed by transition of shear failure to normal mode fracture
Author: Lei, XQ; Li, CL; Shi XH(施兴华); Xu XH(许向红); Wei YJ(魏宇杰)
Source: SCIENTIFIC REPORTS
Issued Date: 2015-05-29
Volume: 5, Pages:10537
Abstract: 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.
Language: 英语
Indexed Type: SCI
Corresponding Author: Wei, YJ (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
Correspondent Email: yujie_wei@lnm.imech.ac.cn
DOI: 10.1038/srep10537
Related URLs: 查看原文
DOC Type: Article
WOS Subject: Multidisciplinary Sciences
WOS Subject Extended: Science & Technology - Other Topics
WOS ID: WOS:000355588300001
ISSN: 2045-2322
Funder: National Natural Science Foundation of China (NSFC) [11425211, 11021262, 11272327] ; MOST 973 of China [2012CB937500] ; Supercomputing Center of Chinese Academy of Sciences
Rank: [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
Department: LNM微结构计算力学(筹)
Classification: 一类
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/54962
Appears in Collections:非线性力学国家重点实验室_期刊论文

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