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本文从断裂特征出发概述了断裂类型及其机理。据此综述了研究K_(1c)和材料力性关系的宏观和微观断裂理论,指出了从特征距离和统计分布两个方面的深入研究K_(1c)的途径。一断裂类型和断裂机理金属材料的断裂可分为脆性断裂和韧性断裂。脆性断裂取决于两个部分,微裂纹的形成和扩展。smith指出,微裂纹成核于微观尺度内发生塑性变形的区域之内或者在该区附近,特别是在滑移被阻塞的地方。已经观察到由滑移带形成裂纹核和在被锁住的孪晶顶端形成的裂纹。对中强钢来说,尤其可
In this paper, the fracture type and its mechanism are summarized. Based on this, the macroscopic and microscopic fracture theories for the study of the relationship between K 1c and material force are summarized, and the ways of further studying K 1c from two aspects of feature distance and statistical distribution are pointed out. A fracture type and fracture mechanism Metal material fracture can be divided into brittle fracture and ductile fracture. Brittle fracture depends on the two parts, the formation and expansion of micro-cracks. Smith points out that microcracks nucleate within or near the areas of plastic deformation in the microscopic scale, especially where slip is blocked. Crack nuclei formed by slip bands and cracks formed at the top of locked twin crystals have been observed. Especially for medium-strength steel