IMECH-IR  > 非线性力学国家重点实验室
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); Wei, YJ (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
Source PublicationSCIENTIFIC REPORTS
2015-05-29
Volume5Pages:10537
ISSN2045-2322
AbstractIt 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.
DOI10.1038/srep10537
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Indexed BySCI
Language英语
WOS IDWOS:000355588300001
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
Funding OrganizationNational Natural Science Foundation of China (NSFC) [11425211, 11021262, 11272327] ; MOST 973 of China [2012CB937500] ; Supercomputing Center of Chinese Academy of Sciences
DepartmentLNM微结构计算力学(筹)
Classification一类
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/54962
Collection非线性力学国家重点实验室
Corresponding AuthorWei, YJ (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
Recommended Citation
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,&Wei, YJ .(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.
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