Fatigue Strength Prediction of Spot-Welded Joints Using Small Specimen Testing

2008 ◽  
pp. 187-187
Author(s):  
Eisuke Nakayama ◽  
Manabu Fukumoto ◽  
Mitsuo Miyahara ◽  
Kazuo Okamura ◽  
Hiroki Fujimoto ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
Strength Prediction ◽  
Small Specimen ◽  
Spot Welded

scholarly journals Prediction of Fatigue Strength of Spot-Welded Joints Based on Local Material Strength Properties Measured by Small Specimen

2004 ◽  
Vol 53 (10) ◽  
pp. 1136-1142 ◽  
Author(s):  
Eisuke NAKAYAMA ◽  
Mitsuo MIYAHRA ◽  
Kazuo OKAMURA ◽  
Hiroki FUJIMOTO ◽  
Kiyoyuki FUKUI
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
Strength Properties ◽  
Material Strength ◽  
Small Specimen ◽  
Local Material ◽  
Spot Welded

scholarly journals Fatigue strength of spot welded joints of Al-Mg alloy sheets for auto body.

1991 ◽  
Vol 41 (10) ◽  
pp. 711-715 ◽  
Author(s):  
Hideo MIZUKOSHI ◽  
Keizo NANBA ◽  
Hiromichi SANO
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
Mg Alloy ◽  
Auto Body ◽  
Spot Welded

Influence of Strength Level of Steels on Fatigue Strength and Fracture Morphology of Spot Welded Joints

2011 ◽  
Vol 462-463 ◽  
pp. 94-99
Author(s):  
Keiichiro Tohgo ◽  
Tomoya Ohguma ◽  
Yoshinobu Shimamura ◽  
Yoshifumi Ojima
Keyword(s):  
Finite Element ◽  
Fatigue Strength ◽  
Mild Steel ◽  
Welded Joints ◽  
High Strength ◽  
Fracture Morphology ◽  
Fatigue Tests ◽  
Finite Element Analyses ◽  
Ultra High Strength Steel ◽  
Spot Welded

In this paper, fatigue tests and finite element analyses are carried out on spot welded joints of mild steel (270MPa class) and ultra-high strength steel (980MPa class) in order to investigate the influence of strength level of base steels on fatigue strength and fracture morphology of spot welded joints. From the fatigue tests the following results are obtained: (1) Fatigue limit of spot welded joints is almost the same in both steels. (2) Fatigue fracture morphology of spot welded joints depends on the load level in the ultra-high strength steel, but not in the mild steel. From discussion based on the finite element analyses the following results are obtained: (3) The fatigue limit of spot welded joints can be predicted by stress intensity factors for a nugget edge, fracture criterion for a mixed mode crack and threshold value for fatigue crack growth in base steel. (4) Plastic deformation around a nugget in spot welded joints strongly affects the fatigue fracture morphology.

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