Effect of the Mean Stress Applied to Specimens on the Fatigue Crack Propagating Rate and Observation of the Micro-Structure at the Crack Tip by the X-Ray Microbeam Diffraction Technique

Abstract

When the mean stress is applied to the notched low-carbon steel specimens subjected to alternating push-pull load, the effect on the crack propagating rate is discussed from the view point of the microstructural change at the crack tip observed by the X-ray microbeam diffraction technique.