1212 Relationship between Fatigue Strength and the Residual Stress at the Thread Root : 1st Report: X-ray Measurement of Residual Stress on the Groove-Rolled Specimen

2008 ◽  
Vol 2008.8 (0) ◽  
pp. 85-88
Author(s):  
Akihiro FURUKAWA ◽  
Masaya HAGIWARA
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
X Ray ◽  
Rolled Specimen ◽  
Thread Root

scholarly journals Fatigue Strength and X-ray Triaxial Residual Stress Measurement of Annealed Fine Grained Steels Processed by Shot Peening

2009 ◽  
Vol 58 (7) ◽  
pp. 610-617
Author(s):  
Katsuhiro SEKI ◽  
Masayuki SHOZU ◽  
Masahide GOTOH ◽  
Munetoh HASHIMOTO ◽  
Toshihiko SASAKI ◽  
...  
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Shot Peening ◽  
Stress Measurement ◽  
Residual Stress Measurement ◽  
X Ray ◽  
Fine Grained ◽  
Fine Grained Steels

Recent x-ray diffraction studies of metal fatigue in Japan

1975 ◽  
Vol 10 (1) ◽  
pp. 32-41 ◽  
Author(s):  
K Tanaka
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Fatigue Damage ◽  
Fatigue Cracks ◽  
Stress And Strain ◽  
Metal Fatigue ◽  
X Ray Diffraction ◽  
X Ray ◽  
Future Developments ◽  
Non Destructive

This paper describes results of several recent studies, carried out in Japan, on metal-fatigue problems using X-ray diffraction techniques. The subjects covered are the effect of residual stress on fatigue strength, non-destructive detection of fatigue damage from information supplied by X-ray diffraction, and X-ray microbeam analysis of stress and strain near the tips of fatigue cracks and fracture surfaces. The usefulness of the X-ray approach to fatigue problems is emphasized and possible future developments are suggested.

scholarly journals Effect of Fine Particle Peening Using Hydroxyapatite Particles on Rotating Bending Fatigue Properties of β-Type Titanium Alloy

2021 ◽  
Vol 11 (9) ◽  
pp. 4307
Author(s):  
Yuki Nakamura ◽  
Koichiro Nambu ◽  
Toshikazu Akahori ◽  
Toshihiro Shimizu ◽  
Shoichi Kikuchi
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Fine Particle ◽  
Compressive Residual Stress ◽  
Cycle Life ◽  
Transfer Layer ◽  
Bending Fatigue ◽  
X Ray ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

Fine particle peening (FPP) using hydroxyapatite (HAp) shot particles was performed to improve the fatigue strength and form a HAp transfer layer on a beta titanium alloy (Ti–22V–4Al). The surface microstructures of the FPP-treated specimen were characterized using scanning electron microscopy, micro-Vickers hardness testing, energy dispersive X-ray spectrometry, X-ray diffraction, and electron backscattered diffraction. A HAp transfer layer with a thickness of 5.5 μm was formed on the surface of the Ti–22V–4Al specimen by FPP. In addition, the surface hardness of the Ti–22V–4Al was increased, and high compressive residual stress was generated on the specimen surface by FPP. Rotating bending fatigue tests were performed at room temperature in laboratory air over a wide cycle-life region (103–109 cycles). In the long cycle-life regime, the fatigue strength at 107 cycles of the FPP-treated specimen became higher than that of the untreated specimen. This result is attributed to the formation of a work-hardened layer with high compressive residual stress by FPP. However, the fatigue strength was not improved by FPP in the short cycle-life regime, because fatigue cracks were initiated at surface defects formed during the FPP process. The fatigue fracture mode of the FPP-treated specimens shifted from surface-initiated fracture to subsurface-initiated fracture at a stress amplitude level of 600 MPa.

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