Abstract
Rotating bending and torsional fatigue tests were carried out on specimens of cast stainless steel. The initiation and propagation processes of microcracks were investigated using the plastic replica method. The main results are summarized as follows. (1) The critical cracks appeared at a microshrinkage cavity in rotating bending fatigue, but not in torsional fatigue. Therefore, the ratio of fatigue limits in cast stainless steel (τw/σw≒0.77) is larger than that of defect-free isotropic carbon steel (τw/σw≒0.65). (2) The crack growth laws in rotating bending and torsional fatigue are expressed by dl/dN∝σ7.8l and dl/dN∝τ9.0l, respectively. (3) The difference between the dependences of Nf on the stress amplitude in rotating bending fatigue and in torsional fatigue can be explained by the above crack growth laws.
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: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A
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.
