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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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