只有小裂纹扩展到足够长并钝化到足够宽，才能够影响主裂纹的扩展及其前端应力、应变的分布。
Only if this short crack extends long enough and blunted wide enough, can it affect the principal crack extension and the distribution of stress and plastic strain.
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.
止裂后的裂纹尖端变得十分圆整。达到了钝化止裂的目的。
The curvature of crack tip increased after crack arresting, so the crack tip was passivated.
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