quarter crack

1. That quarter crack is getting worse.
   裂了四分之一还可能更糟。
2. Owing to the existence of the stress singularities on the crack tip, stress intensity factors of plate surface crack are calculated by three-dimensional finite element method, and 3-D prismatic quarter point 20-node isoparametric degenerate paradoxical elements are used for the region near the crack tip.
   考虑到裂纹前缘处的应力奇异性，在利用有限元方法计算平板表面裂纹的应力强度因子时，裂纹前缘采用三维四分之一分点20节点等参退化奇异单元。

noun

1. a crack on the inside of a horse's forefoot