Author(s)

S. Nishida, S. Wang, N. Hattori & N. Nakamura

Abstract

In this paper plane bending fatigue tests have been performed to investigate the effect of die-pressing on fatigue strength of specimens with a central circular hole notch The main results obtained in this study are as follows: (1) By applying a die-press chamfering method, the fatigue limit of notched specimen increases with 63% higher than that of specimen without chamfering; The increment obtained by the above method is over 4 times of the increment obtained by the machining chamfering method. (2) The fatigue strength enhancing may attribute to the work-hardening and compressive residual stress that suppress the fatigue crack initiation and early stage propaga

Keywords