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。
It is found that opposite sign dislocations appear on the slip plane immediately ahead of the crack tip.
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。
The dislocation distribution function in the plastic zone at a crack tip is calculated with the help of a modified BCS-type crack model.
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。
These negative dislocations seem to enter the crack tip and blunt it, resulting in a dislocation-free zone at the crack tip.
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