Mode II fatigue crack growth under reversed shear and static biaxial compression was investigated in two bearing steels. Many aborted branches, quasi-orthogonal to the main crack, were observed along the crack face. The compressive stress parallel to the main crack hindered the growth of these branches and favored coplanar mode II crack growth. The crack face sliding displacement profiles measured by DIC were used to derive ΔK_II,eff, at the main crack tip, using elastic–plastic FE simulations with crack face friction, by an inverse method. Friction-corrected crack growth kinetics were obtained for mode II crack growth in both steels.

中文翻译：

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循环模式II+静态双轴压缩下轴承钢的疲劳裂纹扩展

研究了两种轴承钢在反向剪切和静态双轴压缩下的 II 型疲劳裂纹扩展。沿裂缝面观察到许多与主裂缝准正交的中止分支。平行于主裂纹的压应力阻碍了这些分支的生长，并有利于共面模式 II 裂纹的生长。由 DIC 测量的裂纹面滑动位移分布用于推导主裂纹尖端的 ​​ΔK _II,eff，使用具有裂纹面摩擦的弹塑性有限元模拟，通过逆向方法。获得了两种钢中 II 型裂纹扩展的摩擦校正裂纹扩展动力学。