학술논문
Influence of crack-like surface defects on the fatigue limit of nitrocarburized carbon steel
Document Type
Article
Author
Source
IOP Conference Series: Materials Science and Engineering; June 2018, Vol. 372 Issue: 1 p012005-012005, 1p
Subject
Language
ISSN
17578981; 1757899X
Abstract
The aim of this study was to evaluate the influence of surface crack on the bending fatigue limit of nitrocarburized steel. Semicircular slits with depths of 0.040, 0.075, and 0.100 mm were introduced on the surface of nitrocarburized medium carbon steel specimens to simulate the presence of small cracks. Bending fatigue tests were performed at room temperature in air with the stress ratio R = [?]1. It was observed that the fatigue limit decreased as the depth of the slit increased. The acceptable crack size was estimated based on fracture mechanics. The predicted acceptable crack size was consistent with the experimental result. Therefore, the acceptable crack size of nitrocarburized carbon steel could be predicted via analysis based on fracture mechanics.