序言 自从断裂力学理论应用于应力腐蚀断裂领域以后,逐渐研制出了一些测定材料的所谓界限应力强度因子K_(Iscc)参量的试验方法。尤其近些年来,已有几种试验方法越来越多地应用于研究各种材料的应力腐蚀断裂性能。对于铝合金的研究来说,大都采用DCB试样。这种试样裂纹尖端应力强度因子K_1的表达式,已有不少人做过试验研究,国内、外通用的公式是: INTRODUCTION Since the fracture mechanics theory was applied in the field of stress corrosion cracking, some test methods have been gradually developed for the determination of the so-called critical stress intensity factor K Iscc parameter of materials. In recent years, in particular, several test methods have been increasingly used to study the stress corrosion cracking behavior of various materials. For aluminum alloy research, the majority of DCB samples. This sample crack tip stress intensity factor K_1 expression, many people have done a pilot study, the common formula at home and abroad are: