| 裂纹顶端的异号位错和无位错区的象力理论 |
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| 引用本文： | 龙期威,熊良钺. 裂纹顶端的异号位错和无位错区的象力理论[J]. 物理学报, 1984, 33(6): 755-761 |
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| 作者姓名： | 龙期威 熊良钺 |
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| 作者单位： | 中国科学院金属研究所 |
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| 摘 要： | 本文改进BCS型裂纹位错模型,并对裂纹顶端范性区的位错密度分布进行了计算。结果指出,在紧靠裂纹顶端的滑移面上出现和裂纹位错异号的位错。这些负号位错将移至裂纹顶端并使之钝化而留下一个无位错区或低位错密度区。本文对无位错区形成的象力理论进行了讨论。关键词：
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| 收稿时间： | 1983-01-26 |
THE OPPOSITE SIGN DISLOCATIONS AT A CRACK TIP AND THE IMAGE FORCE THEORY OF DISLOCATION-FREE ZONE |
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| LONG QI-WEI and XIONG LIANG-YUE. THE OPPOSITE SIGN DISLOCATIONS AT A CRACK TIP AND THE IMAGE FORCE THEORY OF DISLOCATION-FREE ZONE[J]. Acta Physica Sinica, 1984, 33(6): 755-761 |
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| Authors: | LONG QI-WEI and XIONG LIANG-YUE |
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| Abstract: | The dislocation distribution function in the plastic zone at a crack tip is calculated with the help of a modified BCS-type crack model. It is found that opposite sign dislocations appear on the slip plane immediately ahead of the crack tip. These negative dislocations seem to enter the crack tip and blunt it, resulting in a dislocation-free zone at the crack tip. The image force theory of the formation of dislocation-free zone is discussed. |
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