Notch Effect of Materials: Strengthening or Weakening?

IMR OpenIR

	Notch Effect of Materials: Strengthening or Weakening?
	R. T. Qu; P. Zhang; Z. F. Zhang
	2014
发表期刊	Journal of Materials Science & Technology
ISSN	1005-0302
卷号	30 期号:6 页码:599-608
摘要	Notch 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.
部门归属	[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
关键词	Notch 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
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73359
专题	中国科学院金属研究所
推荐引用方式 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.