Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7172098 | International Journal of Fatigue | 2015 | 14 Pages |
Abstract
In this work, the former experimental results were reintroduced and new discussions were developed by performing additional experiments and analyses paying an attention to microstructure and dislocation structure. Thus, it was found that the loading frequency effect at ultrasonic frequency is due to a particular behavior of B.C.C. ferrite under high strain rate. Such a behavior causes strain inhomogeneities at grain boundaries, and then facilitates the intergranular crack initiation mode rather than the usual intragranular one often reported at lower loading frequencies. Longer ultrasonic fatigue lives at ultrasonic frequency are directly related to this transition of the crack initiation mode. In addition, effects of the pearlitic volume fraction on the fatigue behavior have been also discussed in the present work.
Related Topics
Physical Sciences and Engineering
Engineering
Mechanical Engineering
Authors
Benjamin Guennec, Akira Ueno, Tatsuo Sakai, Masahiro Takanashi, Yu Itabashi, Mie Ota,