Abstract
Low cycle fatigue tests were performed for austenitic stainless steel, JIS SUS316L, used for pressure vessel and piping of engineering plants. This study investigated the effect of variable amplitude strain conditions on the fatigue strength. Fatigue tests were conducted under two-step and repeated two-step variable amplitude strain conditions, in which the influence of straining history on the hardening and softening behavior of the material had an important role on the fatigue strength. The experimental results were compared with predictions of the fatigue lives based on the fracture mechanics approach in conjunction with the hardening and softening behavior. These comparisons were performed for a fatigue usage factor, UF, calculated by the linear damage accumulation law using the fatigue strength diagram obtained under constant amplitude straining tests. The UF value at fracture, UFf, reduced under the variable amplitude straining conditions depending on the straining history. Variations of stress under the strain controlled tests were measured in detail and used for the fatigue life predictions. The results indicate that the minimum value of 0.7 for the UFf gives conservative evaluation of the low-cycle fatigue life.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of the Society of Materials Science, Japan
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
