Fracture behavior at crack tip - a new framework for cleavage mechanism of steel

doi:10.1016/S1359-6454(02)00581-5

	Fracture behavior at crack tip - a new framework for cleavage mechanism of steel
	Chen, JH; Wang, Q ; Wang, GZ ; Li, Z
	2003-04-18
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	51 期号:7 页码:1841-1855
摘要	The fracture behavior at crack tip was analyzed based on: (1) observations of fracture surfaces and measurements of local critical parameters for cleavage of three point bending (3PB) precracked specimens of C-Mn steel, (2) detailed observations of configuration changes at precrack tips by metallographic cross sections in specimens unloaded at various applied loads, (3) sophisticated FEM calculations of distributions of stress, strain and triaxiality and simulations of short cracks initiated and extended at precrack tips. The results show that before a critical load (a critical COD) is reached, the crack tip is only blunted and in its vicinity three criteria for cleavage fracture (epsilon(p) greater than or equal to epsilon(pc) for initiating a crack nucleus; sigma(m)/sigma(e) greater than or equal to T-c for preventing the crack tip from blunting; and sigma(yy) greater than or equal to sigma(f) for propagating the crack) are satisfied in different regions separated from each other, the nucleated cracks cannot be propagated and cleavage fracture cannot be triggered. As the applied load increases higher than this critical load, a short crack is initiated and extended at the precrack tip and then is blunted again. The plastic strain and the stress in front of the precrack are redistributed. While the plastic strain remains in front of the tip, the stress triaxiality is rebuilt. At a second critical load, the regions where the three criteria are satisfied overlap each other and a cleavage crack can be nucleated and propagated. The minimum distance for cleavage may be determined by the beginning of the overlapping of the mentioned regions. Combined with the three criteria previously suggested, the fracture behavior at crack tip and the corresponding changes of driving forces (epsilon(p), sigma(m)/sigma(e), sigma(yy)) provide a complete physical model for cleavage of steels in the local scale. (C) 2003 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
关键词	cleavage fracture physical model FEM calculation FEM simulation crack tip steel
DOI	10.1016/S1359-6454(02)00581-5
收录类别	SCI ; SCIE
语种	英语
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000182138200002
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	无
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/35887
专题	材料科学与工程学院_特聘教授组
通讯作者	Chen, JH
作者单位	1.Gansu Univ Technol, Lanzhou 730050, Peoples R China 2.Dalian Univ Sci & Engn, Dalian 116000, Peoples R China
推荐引用方式 GB/T 7714	Chen, JH,Wang, Q,Wang, GZ,et al. Fracture behavior at crack tip - a new framework for cleavage mechanism of steel[J]. ACTA MATERIALIA,2003,51(7):1841-1855.
APA	Chen, JH,Wang, Q,Wang, GZ,&Li, Z.(2003).Fracture behavior at crack tip - a new framework for cleavage mechanism of steel.ACTA MATERIALIA,51(7),1841-1855.
MLA	Chen, JH,et al."Fracture behavior at crack tip - a new framework for cleavage mechanism of steel".ACTA MATERIALIA 51.7(2003):1841-1855.

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