Mode II Fatigue Crack Propagation Due to Contract Loading

该项目支持对疲劳裂纹扩展现象的研究。了解这一现象对于轴承、齿轮和轮轨应用中遇到的接触加载情况非常重要。对于拉伸载荷下的裂纹扩展已做了大量的研究。该项目侧重于压缩/剪切加载，包括三个阶段，包括描述裂纹尖端经历的加载路径，检查裂纹分支在应力循环中的行为，以及最后开发适用于接触加载的扩展规律。理论工作是用一个实验部件补充的。

This project supports research on the phenomenon of fatigue crack growth. Understanding the phenomenon is important for contact loading situations encountered in bearings, gears, and wheel/rail applications. Much research on crack growth has been done for tensile loading. This project focuses on compressive/shear loading and comprises three phases covering characterization of load path experienced by a crack tip, examination of behavior of a crack branch during a stress cycle, and finally the development of growth law applicable to contact loading. The theoretical work is swupplemented with an experimental component.