利用黄铜Ⅱ型和Ⅲ型试样研究了应力腐蚀裂纹形核位置和扩展方向与应力分量的关系。结果表明,裂纹在最大正应力处形核,扩展方向与最大正应力相垂直.在Ⅲ型试样中,氨浓度对裂纹扩展形态有影响,氨浓度较高时,由于均匀腐蚀的作用,在45°面上的裂纹很不明显;在氨浓度较低时,则可看到沿试样圆周有许多45°面裂纹,裂纹间隔在10—150μm之间,而在具有最大剪应力的扭转面上则没有裂纹形成。
The effects of the stress components on the nucleation sites and propagation directions of stress corrosion cracks in brass were investigated with specimens under mode Ⅱ and mode Ⅲ loadings. Results indicated that: under mode Ⅱ loading, stress corrosion cracks nucleated on the site with maximum normal stress component and propagated along the plane perpendicular to the maximum normal stress; under mode Ⅲ loading, the stress corrosion crack was not evident on the 45°plane due to the general corrosion in aqueous solution with high NH_4OH concentration, while stress corroded in aqueous solution with low NH_4OH concentration, numerous cracks with spacings of 10-150μm were found on the 45°plane with maximum normal stress and no stress corrosion cracks was observed on the plane with maximum shear stress.
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