scholarly journals Surface Characteristics and Bending Fatigue Limit of Carburized Steel treated by Double Shot Peening using Centrifugal Force type equipments

2014 ◽  
Vol 2014 (59) ◽  
pp. 7-12
Author(s):  
Katsuyuki MATSUI ◽  
Yoshitomi YAMADA ◽  
Tadao IREI ◽  
Yasuyuki JIN
Keyword(s):  
Fatigue Limit ◽  
Centrifugal Force ◽  
Shot Peening ◽  
Surface Characteristics ◽  
Bending Fatigue ◽  
Carburized Steel

Application of the Concept of Local Fatigue Strength after Shot Peening of Notched Components Based on Numerical Simulations

2010 ◽  
Vol 638-642 ◽  
pp. 912-917
Author(s):  
Manuel Klemenz ◽  
Volker Schulze
Keyword(s):  
Surface Layer ◽  
Fatigue Strength ◽  
Fatigue Limit ◽  
Shot Peening ◽  
Surface Characteristics ◽  
Complex Stress ◽  
Simulated Surface ◽  
Induced Changes ◽  
Notched Components

Shot Peening is a well established mechanical surface treatment to induce compressive residual stresses and work hardening into the surface layer of components exposed to cyclic loading. Due to the induced changes in the surface layer, the fatigue limit increases significantly. The concept of local fatigue strength is based on the comparison of the locally effective fatigue limit with locally active loads in order to estimate the maximum outer loading that will not exceed fatigue limit. In this paper an approach of using simulated surface characteristics after shot peening for the determination of the local fatigue strength will be presented. The complex stress distribution due to cyclic bending of notched geometries will also be determined by FEM. Finally the simulated estimation of the fatigue limit of differently notched specimens of AISI 4140 will be verified with experimentally determined fatigue limits.

Influence of Small Surface Defects on Fatigue Limit of Nitrided and Shot Peening Steel

2009 ◽  
Vol 417-418 ◽  
pp. 57-60 ◽  
Author(s):  
Ines Fernández Pariente ◽  
Sara Bagherifard ◽  
Ramin Ghelichi ◽  
Mario Guagliano
Keyword(s):  
Fatigue Limit ◽  
Shot Peening ◽  
Surface Defect ◽  
Surface Defects ◽  
Fatigue Behaviour ◽  
Residual Stress Field ◽  
Small Surface ◽  
Bending Fatigue ◽  
Micro Holes ◽  
A Minor

Effects of surface defect size and the method used to obtain the defect itself on bending fatigue behaviour of nitrided and shot peened steel was studied. Two different series of 15 sandglass specimens with a microhole in the minimum section generated after nitriding and shot peening treatments were considered. In one series the microholes were obtained by controlled electro-erosion. In the other series microholes were obtained by indentation, much more invasive that electro-erosion, simulating a damage due to a mechanical impact or scratch on the surface material, common on real components during the life span. In both cases the microholes act as a pre-existent crack. The results show that defects obtained by indentation lead to a minor fatigue limit with respect of larger defects obtained by electro-erosion. This was interpreted as the modification of the residual stress field due to the mechanical indentation. On the basis of the results some consideration is formulated about generating micro-holes with one of the discussed ways.

Improvement in Fatigue Limit by Shot Peening for High-Strength Steel Containing Crack-Like Surface Defect: Influence of Surface Crack Aspect Ratio

2013 ◽  
Author(s):  
Makiko Nakagawa ◽  
Koji Takahashi ◽  
Toshio Osada
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Aspect Ratio ◽  
Intensity Factor ◽  
Fatigue Limit ◽  
Shot Peening ◽  
High Strength Steel ◽  
High Strength ◽  
Bending Fatigue ◽  
Aspect Ratios

The effect of shot peening (SP) on the bending fatigue limit of high-strength steel (SUP9A) containing a semi-elliptical surface slit was investigated. SP was conducted on specimens containing a semi-elliptical surface slit with an aspect ratio (a/c) of 0.4, where a was the crack depth (a = 0.1, 0.2, and 0.3 mm) and c was half the surface length of the crack. Bending fatigue tests were carried out under a stress ratio R equal to 0. The results showed that the fatigue limit of the shot-peened specimens with slits having a depth of less than 0.2 mm was almost the same as that of the shot-peened specimens without slits. Meanwhile, some of the specimens fractured at the surface in areas other than the slit. Thus, the maximum depth of the slit that could be rendered harmless by SP was 0.2 mm. The maximum depths of cracks with various aspect ratios that could be rendered harmless by SP were predicted, assuming that the cracks were arrested when the apparent stress intensity factor at the slit tip was less than the threshold stress intensity factor of the material. The estimated values were in good agreement with the experimental values. A harmless crack assessment diagram was proposed based on this estimation method.

Effect of Combined Shot Peening on Fatigue Limit of TC4 which Have Different Microstructure

2011 ◽  
Vol 55-57 ◽  
pp. 1138-1141 ◽  
Author(s):  
Ai Ling Wen ◽  
Sheng Wu Wang ◽  
Rui Ming Ren ◽  
Xiu Xia Yan
Keyword(s):  
Fatigue Limit ◽  
Shot Peening ◽  
Treatment Process ◽  
Lamellar Microstructure ◽  
Surface Damage ◽  
High Energy ◽  
Fatigue Tests ◽  
Bending Fatigue ◽  
Surface Nanocrystallization ◽  
Effect Of Surface

The rotary bending fatigue tests were to investigate the effect of the combined shot peening for surface nanocrystallization (CSPN) on the fatigue limit of titanium (TC4). CSPN formed nano-crystallization in surface layer of TC4, and may reduce and reducing the surface damage of TC4 by high energy shot peening. In the case of equiaxed microstructure, the fatigue limit of TC4 specimen treated by high-energy shot peening is increased by 13%, while the fatigue limit of TC4 specimen treated by the CSPN is increased by 34%. But in the case of lamellar microstructure, the fatigue limits of the specimens by either the surface treatment process both of the high energy shot peening and CSPN. The main reason of fatigue improvement change is due to that the effect of surface nanocrystallization and surface damage repairing by CSPN is changed between the different microstructure of TC4.

scholarly journals Increase in Fatigue Limit of Gears by Compound Surface Refining Using Vacuum Carburizing, Contour Induction Hardening and Double Shot Peening

2002 ◽  
Vol 45 (2) ◽  
pp. 290-297 ◽  
Author(s):  
Katsuyuki MATSUI ◽  
Hirohito ETO ◽  
Katsuya YUKITAKE ◽  
Yoshitaka MISAKA ◽  
Kotoji ANDO
Keyword(s):  
Fatigue Limit ◽  
Shot Peening ◽  
Induction Hardening ◽  
Vacuum Carburizing ◽  
Compound Surface

Impact of Isotropic Superfinishing on Contact and Bending Fatigue of Carburized Steel

2002 ◽  
Author(s):  
Lane Winkelmann ◽  
Mark Michaud ◽  
Gary Sroka ◽  
A. Alan Swiglo
Keyword(s):  
Bending Fatigue ◽  
Carburized Steel

scholarly journals Effects of Case Depth and Notch Shape on the Rotating Bending Fatigue Properties of Carburized Steel

1980 ◽  
Vol 66 (3) ◽  
pp. 410-417 ◽  
Author(s):  
Tôru FURUKAWA ◽  
Shizuyo KONUMA ◽  
Hideyasu SAKANIWA ◽  
Tadashi KASUYA
Keyword(s):  
Case Depth ◽  
Fatigue Properties ◽  
Bending Fatigue ◽  
Carburized Steel ◽  
Rotating Bending Fatigue ◽  
Rotating Bending
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