一、前言断裂力学的重大成果之一,是在承认材料自身存在缺陷的情况下,给定了评定材料抗断裂能力的力学性能指标。断裂韧度K_(1c)、δ_c和J_(1c)系指材料的静态断裂韧性。它是籍助试验机用慢弯曲或慢拉伸方式试验得到的。在各国所制订的金属材料断裂韧度K(1c)δ_c和J_(1c)试验标准 I. Introduction One of the major achievements in fracture mechanics is to give a mechanical performance index to evaluate the fracture resistance of materials given the defects of the material itself. Fracture toughness K_ (1c), δ_c and J_ (1c) refer to the static fracture toughness of the material. It is aided by the test machine with a slow bend or slow stretch test obtained. In countries developed by the fracture toughness of metallic materials K (1c) δ_c and J_ (1c) test standards