Paper Title:
Influence of Strength Level of Steels on Fatigue Strength and Fracture Morphology of Spot Welded Joints
  Abstract

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.

  Info
Periodical
Key Engineering Materials (Volumes 462-463)
Edited by
Ahmad Kamal Ariffin, Shahrum Abdullah, Aidy Ali, Andanastuti Muchtar, Mariyam Jameelah Ghazali and Zainuddin Sajuri
Pages
94-99
DOI
10.4028/www.scientific.net/KEM.462-463.94
Citation
K. Tohgo, T. Ohguma, Y. Shimamura, Y. Ojima, "Influence of Strength Level of Steels on Fatigue Strength and Fracture Morphology of Spot Welded Joints", Key Engineering Materials, Vols. 462-463, pp. 94-99, 2011
Online since
January 2011
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Price
$32.00
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