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Title: Improvement Of Bending Fatigue Limit By Shot Peening For Spring Steel Specimens Containing An Artificial Surface Defect
Author: KTakahashi Ando Amano Miyamoto FTakahashi Tange On
Source: Conf Proc: ICSP-10 Tokyo, Japan 2008
Publication year 2008
Document number: 2008085
Number of pages: 6
Abstract:
ABSTRACT
Effects of shot peening on the bending fatigue limit of spring steel specimens (SUP9A) containing an artificial small hole were investigated. Shot peening (SP) and stress
shot peening (SSP) were carried out with specimens containing an artificial drilled hole 0.2, 0.4 and 0.8 mm in diameter. Bending fatigue tests were carried out with the
specimens. The fatigue limits of specimens containing an artificial small hole were increased by shot peening. Stress shot peening (SSP) was more effective in improving
fatigue limit. The specimens containing an artificial hole of a 0.2 mm diameter which received SP or SSP fractured elsewhere than on the hole, and they had very high fatigue
limits. The fatigue limit of specimens having an artificial hole under 0.2mm in diameter was determined by threshold condition for the non-propagation of fatigue cracks that
emanated outside the drilled hole. From these results, it can be concluded that an artificial drilled hole under 0.2 mm in diameter can be made non-damaging by shot peening.
KEY WORDS Shot peening, Bending, Fatigue limit, Surface defect, Residual stress, Non-propagating crack
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This page last revised: 03/22/2010