scholarly journals INFLUENCE OF PLATE THICKNESS AND RESIDUAL STRESS ON FATIGUE STRENGTH OF FILLET WELDED JOINTS UNDER BENDING LOADS : Influence of plate thickness and residual stress on fatigue crack growth behaviors of non-load-carrying fillet welded joints under bending loads (2nd Report)

1997 ◽  
Vol 62 (501) ◽  
pp. 103-107
Author(s):  
Katsumi HARADA ◽  
Yoshiyuki MITSUI
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Fatigue Strength ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Welded Joints ◽  
Plate Thickness ◽  
Load Carrying ◽  
Bending Loads

Modelling of ultrasonic impact treatment (UIT) of welded joints and its effect on fatigue strength

2015 ◽  
Author(s):  
K.L. Yuan ◽  
Y. Sumi
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Welded Joints ◽  
Simulation Method ◽  
Fe Model ◽  
Engineering Structures ◽  
Ultrasonic Impact Treatment ◽  
Acoustic Softening

Ultrasonic impact treatment (UIT) is a remarkable post-weld technique applying mechanical impacts in combination with ultrasound into the welded joints. In the present work, a 3D simulation method including welding simulation, numerical modelling of UIT-process and an evaluation of fatigue crack growth has been developed. In the FE model, the actual treatment conditions and local mechanical characteristics due to acoustic softening are set as input parameters. The plastic deformation and compressive stress layer are found to be more pronounced when acoustic softening takes place. The predicted internal residual stress distributions of welded joint before and after UIT are compared with experimental results, showing a fairly good agreement with each other. Finally, simulated results of fatigue crack growth in various residual stress fields are well compared with test results, so that the proposed model may provide an effective tool to simulate UIT-process in engineering structures.

Suppression of Fatigue Crack Growth in Austenite Stainless Steel by Cavitation Peening

2010 ◽  
Vol 452-453 ◽  
pp. 641-644 ◽  
Author(s):  
Osamu Takakuwa ◽  
Masaaki Nishikawa ◽  
Hitoshi Soyama
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Surface Modification ◽  
Fatigue Crack ◽  
Fatigue Strength ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Compressive Residual Stress ◽  
Austenite Stainless Steel ◽  
The Impact

Cavitation normally causes severe damage in hydraulic machinery such as pumps and turbines by the impact produced by cavitation bubbles collapsing. Although cavitation is known as a factor of erosion, Soyama et al. succeeded in utilizing impacts of cavitation bubble collapsing for surface modification by controlling cavitating jet in the same way as shot peening. The local plastic deformation caused by cavitation impact enhances the fatigue strength of metallic materials, and the surface modification technique utilizing cavitation impact is called “cavitation peening (CP)”. It is well known that the peening improves fatigue strength by introducing compressive residual stress on the surface, but little attention has been paid to the behavior of fatigue crack growth of the material which was modified by CP. In the present study, the fatigue behavior of austenite stainless steel with and without CP was evaluated by a plate bending fatigue test, and the results revealed that the compressive residual stress introduced by CP suppresses fatigue crack growth rate by 70 % compared to that without CP.

scholarly journals 310 Fatigue Strength and Three-Dimensional Fatigue Crack Growth Process on Spot Welded Joints of Structural Steels

2007 ◽  
Vol 2007.56 (0) ◽  
pp. 135-136
Author(s):  
Tomoya OHGUMA ◽  
Hiroki HAGIMORI ◽  
Keiichiro TOHGO ◽  
Yoshinobu SHIMAMURA ◽  
Hiroyasu ARAKI ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Strength ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Welded Joints ◽  
Growth Process ◽  
Three Dimensional ◽  
Structural Steels ◽  
Crack Growth Process ◽  
Spot Welded
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