它是一种非均质不连续体的脆性材料，其破坏过程是在水力或机械作用下，岩石内部裂纹的产生、扩展、合并和贯通的过程。
It is a brittle material and heterogeneous discontinuous body. The process of its failure is one of initiation of inner cracks of the rock followed by their propagation, connection and link up.
但从微观上看，裂纹的微观扩展路径曲折、不连续，常伴有分枝裂纹的形成。
However, the zig-zag and discontinuous microscopic growth path of fatigue cracks with some branching cracks expanded locally was observed.
一个小裂缝(内部或表面的)或者是结构不连续，在该处施加的拉伸应力将被放大，裂纹会扩展。
Stress raiser. A small flaw (internal or surface) or a structural discontinuity at which an applied tensile stress will be amplified and from which cracks may propagate.
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