JSME International Journal Series A Solid Mechanics and Material Engineering
Online ISSN : 1347-5363
Print ISSN : 1344-7912
ISSN-L : 1344-7912
Effect of Plastic Deformation by Roller-Working on Fatigue Strength of Notched Specimen
Sheng-wu WangShin-ichi NishidaNobusuke HattoriHidetosi TamasakiNorikazu Nakamura
Author information
JOURNALS FREE ACCESS

2000 Volume 43 Issue 4 Pages 415-422

Details
Abstract

In this study, the fatigue test is performed to investigate the effect of plastic deformation by roller-working on the fatigue limit of a notched specimen. Three types of specimens are tested, whose different deformation values are obtained by roller-working and whose final finishing shape and dimensions are the same. The reason why fatigue limit changes with a change in the plastic deformation value is examined by analyzing residual stress, micro-Vickers hardness distribution and crack-tip opening displacement. The main results are as follows : (1) The resistance against fatigue crack initiation increases with an increase in the plastic deformation value. (2) When the deformation value becomes too large by roller-working, residual stress is released by cycle stress amplitude and the critical stress amplitude of non-propagating crack tip opening decreases. (3) The fatigue limit of the roller-worked notched specimen does not necessarily increase when the plastic deformation value becomes too large. (4) The optimum deformation value exists and is about 0.5 mm, to improve the fatigue limit of the roller-worked notched specimen.

Information related to the author
© The Japan Society of Mechanical Engineers
Previous article
feedback
Top