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金属材料,特别是高强度结构材料的断裂力学性能,既决定于材料本性和加工冶金因素,又与其取样部位方向关系很大。为了获得可资比较性能,美国材料试验学会(ASTM)对从各种产品上取样的方位与预制裂纹的预期断裂方向(ASTM 399),作了严密的科学的规定,制定了表达这种关系的系统标志符号。现在,包括我国在内的几乎所有国家,都采用这种表达系统。在翻译外国科学技术文献时,对
The fracture mechanics properties of metal materials, especially high-strength structural materials, depend not only on the nature of the material and on the metallurgical factors but also on the orientation of the sample parts. In order to obtain comparable performance, the ASTM has strict and scientific rules on the expected fracture orientation (ASTM 399) for orientation and prefabricated cracks taken from various products and has established a relationship that expresses this relationship System glyphs. Almost all countries, including my own, now use this system of expression. When translating foreign science and technology literature, yes