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Notch Effect of Materials: Strengthening or Weakening?
R. T. Qu; P. Zhang; Z. F. Zhang
2014
Source PublicationJournal of Materials Science & Technology
ISSN1005-0302
Volume30Issue:6Pages:599-608
AbstractNotch is a very important geometry with widespread applications in engineering structural components. Finding a universal equation to predict the effect of notch on strength of materials is of much significance for structural design and materials selection. In the present work, we tried to find this universal equation from experimental results of metallic glasses (MGs) and other materials as well as theoretical derivations based on a universal fracture criterion (Qu and Zhang, Sci. Rep. 3 (2013) 1117). Experimental results showed that the notch effect of the studied MG was affected by the notch geometry characterized by the stress concentration factor K. As K-t becomes smaller, the notch strength ratio (NSR, which is the ratio of nominal ultimate tensile strength (UTS) of the notched sample to UTS of the unnotched sample) increases. By comparing MGs with other materials like brittle ceramics and ductile crystalline metals, we find that when K-t is same, the NSR is larger for ductile metals but smaller for brittle ceramics. Theoretically, we derived a universal equation for notch effect on strength of materials: NSR = M/K-t, where M is a constant related to materials. This universal equation was found to be consistent with the experimental results.
description.department[qu, ruitao ; zhang, peng ; zhang, zhefeng] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; zhang, zf (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; zhfzhang@imr.ac.cn
KeywordNotch Strength Metallic Glass Fracture Plastic Deformation Bulk Metallic-glass Tensile Fracture Mechanisms Ni-cu-be Amorphous Alloy Shear Bands Toughness Damage Plasticity
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/73359
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
R. T. Qu,P. Zhang,Z. F. Zhang. Notch Effect of Materials: Strengthening or Weakening?[J]. Journal of Materials Science & Technology,2014,30(6):599-608.
APA R. T. Qu,P. Zhang,&Z. F. Zhang.(2014).Notch Effect of Materials: Strengthening or Weakening?.Journal of Materials Science & Technology,30(6),599-608.
MLA R. T. Qu,et al."Notch Effect of Materials: Strengthening or Weakening?".Journal of Materials Science & Technology 30.6(2014):599-608.
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