1. These tortuous crack paths with large crack deflection angle would promote crack closure as well as crack tip stress shielding and then resulted in higher crack growth resistance. 带有较大的裂纹偏差角的这些曲折的裂纹路径会促进裂纹的封闭，同时也会促进裂纹尖端的保护，接着会导致一个较高的裂纹增长抵抗性能。
2. The weld crack of mating flange of high-pressure hydrocracking reactor is described in this article, but the focus is on the checking method of crack, crack cause and repaired checking method. 文章叙述了高压加氢裂化反应器配对法兰接管焊缝裂纹现象，重点介绍了裂纹的检查检测方法、产生原因及修复检验方案。
3. By comparing fatigue crack with electrosparking crack, the effects of crack tip on fracture toughness of ductile iron have been studied. 通过开疲劳裂纹和线切割裂纹的对比试验，研究裂纹尖端的尖锐程度对球墨铸铁断裂韧性的影响；
4. The crack arresting has been executed in metal component with crack through pulse current discharge. During current discharge, the crack tip is melted, and then a welded joint formed. 对含有裂纹的金属构件进行脉冲放电止裂时，裂纹尖端由于电流的绕流热集中效应，在瞬间使裂尖熔化形成焊口。
5. It turns out that crack closure is the main reason for retardation, and crack tip blunting, crack deflection and strain-induced martensite would reinforce it. 室温蠕变对裂纹扩展产生延滞的原因主要是裂纹闭合，同时裂尖钝化、裂纹偏折及形变诱发马氏体的形成也会起到一定的作用。
网络释义
alligator crack 龟裂;
crack arrest 止裂;
裂纹停滞;
A tough nut hard to crack 棘手的事，难以说服的人;
She's a tough nut to crack 她这个人不好说话, 我想她不会答应我们的.;
a Gordian knot a hard nut to crack a hot potato 棘手的问题;
