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结构常常因为存在裂纹或裂纹状缺陷,而在远低于结构材料屈服应力的外载条件下发生破坏,即发生低应力脆性破
Structure is often due to the existence of cracks or crack-like defects, but much lower than the yield stress of structural materials under the conditions of the occurrence of damage, the occurrence of low-stress brittle fracture