The Minimum Energy Density Criterion for the Competition between Shear and Flat Fracture

doi:10.1002/adem.201800150

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	The Minimum Energy Density Criterion for the Competition between Shear and Flat Fracture
	Li, HF ; Zhang, P 1; Qu, RT ; Zhang, ZF
刊名	ADVANCED ENGINEERING MATERIALS
	2018-08-01
卷号	20 期号:8 页码:-
关键词	Flat fracture Fracture toughness High strength steel Minimum energy density criterion Shear fracture
ISSN号	1438-1656
DOI	10.1002/adem.201800150
英文摘要	It is generally recognized that the fracture toughness K-IC of materials represents the crack resistance during fracture, i.e., the energy consumption. In this study, AISI 4340 steels with different strength are applied to systematically investigate the intrinsic mechanism of fracture toughness. It is found that the fracture surface morphologies of AISI 4340 steels change from quasi-cleavage fracture to dimple fracture with increasing the tempering temperature. While, the specimen size has almost no effect on the fracture mechanism of shear/flat fracture region, demonstrating that the fracture toughness depends on the proportion of shear and flat fracture region. Additionally, the shear lip width of the K-IC specimen will increase to a constant value with enhancing the specimen thickness. Based on the energy balance principle, the maximum shear lip width can be obtained at the minimum fracture energy density of materials; consequently, there is an essential relationship between the shear fracture and fracture toughness, i.e., the minimum energy density criterion. The new finding, which provides a scaling law to well evaluate the plane strain fracture toughness of new materials with high toughness (e.g., nanostructured materials and metallic glasses), may broad the understandings on the fracture toughness.
学科主题	Materials Science, Multidisciplinary
语种	英语
WOS记录号	WOS:000440898100027
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/80048]
专题	金属研究所_中国科学院金属研究所
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Li, HF,Zhang, P,Qu, RT,et al. The Minimum Energy Density Criterion for the Competition between Shear and Flat Fracture[J]. ADVANCED ENGINEERING MATERIALS,2018,20(8):-.
APA	Li, HF,Zhang, P,Qu, RT,&Zhang, ZF.(2018).The Minimum Energy Density Criterion for the Competition between Shear and Flat Fracture.ADVANCED ENGINEERING MATERIALS,20(8),-.
MLA	Li, HF,et al."The Minimum Energy Density Criterion for the Competition between Shear and Flat Fracture".ADVANCED ENGINEERING MATERIALS 20.8(2018):-.