结果表明，螺栓的预紧应力接近材料的断裂强度。
The results suggest that the stress is close to the breaking strength.
钻杆接头的各种纵向开裂属于低应力脆性断裂。
Longitudinal crack of drill pipe box joint is brittle fracture at low stress.
粗糙表面的晶粒间易产生V形口，导致应力集中，降低了膜的断裂强度。
Rough surface is easy to generate V shape of stress concentration, which reduce fracture strength.
通过初步分析认为，场地附近地应力的变化与断裂构造的发育有关。
It is thought that these variations are related to the development of fractures.
通过初步分析认为，场地附近地应力的变化与断裂构造的发育有关。
It is thought that these variations are related to the development of fractures.
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