Effects of mean shear stress on the torsional fatigue strength of a spring steel with small scratches
Source abstract
Abstract
The torsional fatigue behavior of a high-strength spring steel, SWOSC-V, was investigated. Of particular interest were the influences of small scratches and superimposed static shear stress in the very high cycle fatigue regime. To achieve the research objectives, an ultrasonic torsional fatigue testing machine was developed. S-Ncurves showed the fatigue limit for the tested material condition (i.e. with no residual stresses at specimen surface). This study revealed that a notable influence of the stress ratio, R, on the torsional fatigue behavior was not explicitly recognized. Concerning the influence of small scratches, it was found that the [Formula: see text]-parameter model can predict the lower bound of the torsional fatigue limit, irrespective of the value of R.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Fatigue and fracture mechanics · Microstructure and Mechanical Properties of Steels · Surface Treatment and Residual Stress
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Materials Engineering R&D Division, DENSO Corporation, Aichi, Japan
Department of Mechanical Engineering, Fukuoka University, Fukuoka, Japan
Institute of Materials Science and Technology, Fukuoka University, Fukuoka, Japan
Graduate School of Engineering, Kyusyu University, Fukuoka, Japan
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