Mode II Fatigue Crack Propagation Due to Contract Loading

该项目支持对疲劳裂纹现象的研究 增长 了解这一现象对接触加载很重要 轴承、齿轮和车轮/轨道应用中遇到的情况。 对拉伸载荷下裂纹扩展的研究已经做了很多。 这 该项目的重点是压缩/剪切载荷，包括三个阶段 覆盖裂纹尖端所经历的载荷路径的表征， 在应力循环期间检查裂纹分支的行为，以及 最后发展了适用于接触加载的增长规律。 理论工作是swupplemented与实验的组成部分。

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.