An investigation of the fatigue strength of centrifugally cast steel and its weld joints in agressive media

1979 ◽  
Vol 15 (5) ◽  
pp. 383-385
Author(s):  
K. M. Grigor'ev ◽  
V. G. Salangin
Keyword(s):  
Fatigue Strength ◽  
Cast Steel ◽  
Centrifugally Cast ◽  
Weld Joints

Fatigue Strength Characteristics of Cast Steel Weld Joints

2011 ◽  
Author(s):  
Ho Jung Kim ◽  
Seong Min Kim ◽  
Jae Myung Lee ◽  
Myung Hyun Kim
Keyword(s):  
Fatigue Strength ◽  
Hot Spot ◽  
Cast Steel ◽  
Geometrical Parameters ◽  
Steel Weld ◽  
Hot Spot Stress ◽  
Butt Weld ◽  
Weld Joints ◽  
Fatigue Design ◽  
Notch Stress

The aim of the present paper is to investigate and compare the fatigue characteristics of weld joints in terms of S-N curve between cast steel and conventional mild steel. Two different joints such as thick butt weld joints and fillet weld joints are considered in this study. Fatigue strength of cast steel weld joints with various geometric designs are tested and compared. The fatigue life and the fatigue crack propagation characteristics are investigated by experimental and numerical methods in a systematic manner. The conventional hot spot stress, structural stress and notch stress approaches are employed for the precise interpretation of the fatigue test result of cast steel weld joints. Finally, the estimation of the fatigue limit of cast steel weld joints are attempted based on material properties and geometrical parameters. The results can be used for the efficient fatigue design of various cast steel welded joints.

ON THE WELDED CONNECTIONS OF THE CENTRIFUGALLY CAST STEEL TUBULAR COLUMNS

1984 ◽  
pp. 159-166
Author(s):  
T. Kamba ◽  
H. Kanatani ◽  
K. Fujiwara ◽  
M. Tabuchi ◽  
T. Wakida ◽  
...  
Keyword(s):  
Cast Steel ◽  
Centrifugally Cast ◽  
Tubular Columns

scholarly journals Improvement mechanisms of fatigue strength in weld joints by hammer peening

2019 ◽  
Vol 37 (1) ◽  
pp. 17-23 ◽  
Author(s):  
Yasushi MORIKAGE ◽  
Tsunehisa HANDA ◽  
Tetsuya TAGAWA ◽  
Rinsei IKEDA
Keyword(s):  
Fatigue Strength ◽  
Weld Joints ◽  
Hammer Peening

scholarly journals Notch Stress Intensity Factor (NSIF)-Based Fatigue Design to Assess Cast Steel Porosity and Related Artificially Generated Imperfections

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1097
Author(s):  
Manuel Schuscha ◽  
Michael Horvath ◽  
Martin Leitner ◽  
Michael Stoschka
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Fatigue Strength ◽  
Intensity Factor ◽  
Cast Steel ◽  
Experimental Investigations ◽  
Fatigue Assessment ◽  
Notch Stress Intensity Factor ◽  
Fatigue Design ◽  
Notch Stress

Shrinkage porosities and non-metallic inclusions are common manufacturing process based defects that are present within cast materials. Conventional fatigue design recommendations, such as the FKM guideline (“Forschungskuratorium Maschinenbau”), therefore propose general safety factors for the fatigue assessment of cast structures. In fact, these factors mostly lead to oversized components and do not facilitate a lightweight design process. In this work, the effect of shrinkage porosities on the fatigue strength of defect-afflicted large-scale specimens manufactured from the cast steel G21Mn5 is studied by means of a notch stress intensity factor-based (NSIF-based) generalized Kitagawa diagram. Additionally, the mean stress sensitivity of the material is taken into account and establishes a load stress ratio enhanced diagram. Thereby, the fatigue assessment approach is performed by utilizing the defects sizes taken either from the fracture surface of the tested specimens or from non-destructive X-ray investigations. Additionally, a numerical algorithm invoking cellular automata, which enables the generation of artificial defects, is presented. Conclusively, a comparison to the results of the experimental investigations reveals a sound agreement to the generated spatial pore geometries. To sum up, the generalized Kitagawa diagram, as well as a concept utilizing artificially generated defects, is capable of assessing the local fatigue limit of cast steel G21Mn5 components and features the mapping of imperfection grades to their corresponding fatigue strength limit.

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