scholarly journals High Cycle Fatigue Properties of Shot Peening Treated FPDI in Long Life Region.

1999 ◽  
Vol 65 (638) ◽  
pp. 2086-2091 ◽  
Author(s):  
Yasuo OCHI ◽  
Takeshi SEKINO ◽  
Shohei OKAZAKI ◽  
Takashi MATSUMURA
Keyword(s):  
Shot Peening ◽  
High Cycle Fatigue ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Long Life

Ultra-Long Life Fatigue Behavior of Welded Joints with Shot Blast Treatment

2013 ◽  
Vol 275-277 ◽  
pp. 179-183 ◽  
Author(s):  
Chao He ◽  
Yong Jie Liu ◽  
Qing Yuan Wang
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
Shot Peening ◽  
High Cycle Fatigue ◽  
Base Material ◽  
Ambient Air ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Base Steel ◽  
Long Life

In order to investigate the ultra-long life fatigue properties of welded joints, ultrasonic fatigue tests of base material and welded joints were carried out using Q345q steel in ambient air at room temperature with a stress ratio R=-1. The results showed that the fatigue strength of specimens with welded joints dropped about 60% compared with that of base steel. To improve the fatigue properties of welded joints, two groups of specimens were treated by shot peening with different degrees which produced different compressive residual stresses on samples. It was found that the shot peening treatment could improve the fatigue strength of welded joints obviously. The fatigue fracture surface was analyzed by scanning electron microscopy. The fractography showed that there were two kinds of crack initiation mechanism in the Q345q base steel, crack inition from defects on the surface for high cycle fatigue failure and in the interior of the sample in very high cycle fatigue range. However, almost all cracks of welded joints initiated from defects caused by welding process. The failure of welded joints usually happened at the section of welded toes in the area of fusion or geometric discontinuity.

scholarly journals Influence of Zirconia Shot Peening Treatment on High-Cycle Fatigue Properties of Ti-6Al-4V

2016 ◽  
Vol 65 (9) ◽  
pp. 679-686 ◽  
Author(s):  
Kiyotaka MASAKI ◽  
Yuki YONAKUNI ◽  
Noriyuki HISAMORI ◽  
Yuichiro SUGA ◽  
Yuji KOBAYASHI ◽  
...  
Keyword(s):  
Shot Peening ◽  
High Cycle Fatigue ◽  
Fatigue Properties ◽  
Cycle Fatigue

312 High Cycle Fatigue Property of Shot peening Treated ADI in Long Life Fatigue

2001 ◽  
Vol 2001 (0) ◽  
pp. 251-252
Author(s):  
Takusaburo Hosoya ◽  
Takeshi Sekino ◽  
Kiyotaka Masaki ◽  
Takashi Matsumura ◽  
Yasuo Ochi
Keyword(s):  
Shot Peening ◽  
High Cycle Fatigue ◽  
Fatigue Property ◽  
Cycle Fatigue ◽  
Long Life

scholarly journals Influence of Shot Peening Treatment on High-Cycle Fatigue Properties of Degassing Processed AC4CH Aluminum Alloy

2005 ◽  
Vol 54 (12) ◽  
pp. 1255-1261 ◽  
Author(s):  
Kiyotaka MASAKI ◽  
Youhei KUMAGAI ◽  
Yasuo OCHI ◽  
Takashi MATSUMURA ◽  
Tatsuhiko HAMAGUCHI
Keyword(s):  
Aluminum Alloy ◽  
Shot Peening ◽  
High Cycle Fatigue ◽  
Fatigue Properties ◽  
Cycle Fatigue

The Improvement of High Cycle Fatigue Properties of AC4CH Alloy with Shot Peening Treatment

2005 ◽  
Vol 297-300 ◽  
pp. 1919-1924
Author(s):  
Kiyotaka Masaki ◽  
Yasuo Ochi ◽  
Takashi Matsumura
Keyword(s):  
Fatigue Crack ◽  
Fatigue Life ◽  
Crack Initiation ◽  
Shot Peening ◽  
High Cycle Fatigue ◽  
Fatigue Crack Initiation ◽  
Crack Propagation Rate ◽  
Fatigue Properties ◽  
Fatigue Crack Propagation Rate ◽  
Cycle Fatigue

In order to investigate the effect of SP treatment on the high cycle fatigue properties such as fatigue strength, crack initiation and propagation behaviors, rotating bending fatigue tests on shot-peening (SP) treated AC4CH aluminum alloy were carried out. The fatigue properties of the SP-treated material were compared with fatigue properties of the non-peened material, the hot isostatic pressure (HIP) treated material and the semi-liquid (SL) die casting material. the main conclusions obtained were, (1) The fatigue properties of SP-treated material is most excellent in all materials. (2) The fatigue life property of AC4CH alloys is significantly affected by fatigue crack initiation behavior. The reason why the SP-treated material has longer fatigue life than those of other material is that it has no cast defects near the surface by the effect of SP treatment. (3) The reason of fatigue life improvement by SP treatment is decrease of fatigue crack propagation rate.

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