外端的 meaning in English

outboard

Barrier cracks cannot stop the extending of a fracture , and the strength of the sample is reduced by almost one magnitude because of the existing barrier cracks . there are great differences of ae distribution between specimens with non - penetrate crack and specimens with penetrate crack . as for penetrate crack , ae occurs near the two end of the crack , and for non - penetrate crack , crack , ae occurs near the two end of the crack , and for non - penetrate crack , ae occurs near the front edge of crack , which can be explained well by the theory of 3 - d fracture ; ae distribution near the outer part of collinear crack is similar with that of the end of penetrate crack , and inner part of collinear cracks will run - through with high loads
关于预制裂纹系对岩石破裂的影响，集中讨论了：空障碍体构造不能阻止主裂纹的扩展，反而会使岩石的破裂强度降低近一个量级；由于构造的不同，非穿透切口样品和穿透切口样品的声发射空间分布特点有本质区别，穿透切口样品的微破裂在切口两端发育，而非穿透切口样品的微破裂在切口两端之间切口前缘处发育，这用三维破裂理论可以很好地解释；含共线构造的岩石，裂纹外端的声发射分布与单裂纹构造中裂纹端部的声发射分布相似，裂纹内端声发射有密集分布，在应力达到一定水平时，内端部发生错断，而不是贯通。