| EFFECTS OF DISLOCATION CONFIGURATION, CRACK BLUNTING AND FREE SURFACES ON THE TRIGGERING LOAD OF DISLOCATION SOURCES |
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| 作者姓名： | Lu Zhixing Wang Xuyue Yu Shouwen Feng Xiqiao |
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| 作者单位： | Lu Zhixing~1 Wang Xuyue~2 Yu Shouwen~1 Fang Xiqiao~1 1 Department of Engineering Mechanics，Tsinghua University，Beijing 100084，China 2 Department of Basic Science，Graduate School at Shenzhen，Harbin Institute of Technology，Shenzhen 518055，China |
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| 摘 要： | The effects of dislocation configuration,crack blunting and free surfaces on the triggering load of dislocation sources in the vicinity of a crack or a wedge tip subjected to a tensile load in the far field are investigated.An appropriate triggering criterion for dislocation sources is proposed by considering the configurational forces acting on each dislocation.The triggering behaviors of dislocation sources near the tips of a crack and a wedge are compared.It is also found that the blunting of crack tip and the presence of free surfaces near the crack or the wedge have considerable influences on the triggering load of dislocation sources.This study might be of significance to gaining a deeper understanding of the brittle-to-ductile transition of materials.
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| 关 键 词： | 裂缝 楔 源位错 柔软跃迁 位错构型 |
| 收稿时间： | 29 June 2006 |
| 修稿时间： | 2006-06-292007-03-29 |
EFFECTS OF DISLOCATION CONFIGURATION,CRACK BLUNTING AND FREE SURFACES ON THE TRIGGERING LOAD OF DISLOCATION SOURCES |
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| Lu Zhixing Wang Xuyue Yu Shouwen Feng Xiqiao.EFFECTS OF DISLOCATION CONFIGURATION, CRACK BLUNTING AND FREE SURFACES ON THE TRIGGERING LOAD OF DISLOCATION SOURCES[J].Acta Mechanica Solida Sinica,2007,20(2):103-109. |
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| Authors: | Lu Zhixing Wang Xuyue Yu Shouwen Feng Xiqiao |
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| Institution: | 1. Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;2. Department of Basic Science, Graduate School at Shenzhen, Harbin Institute of Technology, Shenzhen 518055, China;1. Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan;2. National Nano Device Laboratories, National Applied Research Laboratories, 741, Taiwan;1. Department of Rheumatology and Clinical Immunology, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China;2. Department of Clinical Laboratory, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi Zhuang Autonomous Region, China |
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| Abstract: | The effects of dislocation configuration,crack blunting and free surfaces on the triggering load of dislocation sources in the vicinity of a crack or a wedge tip subjected to a tensile load in the far field are investigated.An appropriate triggering criterion for dislocation sources is proposed by considering the configurational forces acting on each dislocation.The triggering behaviors of dislocation sources near the tips of a crack and a wedge are compared.It is also found that the blunting of crack tip and the presence of free surfaces near the crack or the wedge have considerable influences on the triggering load of dislocation sources.This study might be of significance to gaining a deeper understanding of the brittle-to-ductile transition of materials. |
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| Keywords: | dislocation source crack wedge brittle-to-ductile transition |
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