实质断裂强度性能受到了外加载荷与磨削残余应力的组合应力的制约。
The real fracture strength is restrained by both stresses caused by outside load and residual stresses after grinding.
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.
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.
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