Fatigue Strength Assessment Including Welding Residual Stress of Spot Welded Joints Subjected to Cross-tension Loads

This paper presents a method to assess of fatigue strength for resistance spot welded joints, which incorporates welding residual stress effects. To achieve this, first, a non-linear finite element analysis (FEA) was performed to simulate the spot-welding process. To validate the FEA results, the numerically calculated welding residual stresses of spot welds were then compared with experimental results measured by X-ray diffraction method. The residual stress distributions showed good agreement between calculations and experiments. To evaluate the effects of welding residual stress on the fatigue design criterion of resistance spot welded joints subjected to cross-tension load, the stress amplitude (σa-res) taking into account welding residual stress at a spot weld was proposed based on a modified Goodman equation incorporating the residual stress effect. Using the stress amplitude σa-res at the nugget edge of a spot weld, the ΔP − Nf relations obtained as the fatigue test results for spot welded joints were systematically rearranged to the σa-res − Nf relation. It was found that the proposed stress amplitude (σa-res) provides more reasonable and accurate fatigue design criterion of spot welded joints subjected to cross-tension load.

• Record URL:
  https://doi.org/10.1007/s12239-014-0080-0
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/12299138
• Supplemental Notes:
  • Copyright © 2014, The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg.
• Authors:
  • Park, Y
  • Sohn, I
  • Bae, D
• Publication Date: 2014-8

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 765-771
• Serial:
  • International Journal of Automotive Technology
  • Volume: 15
  • Issue Number: 5
  • Publisher: Korean Society of Automotive Engineers
  • ISSN: 1229-9138
  • EISSN: 1976-3832
  • Serial URL: http://link.springer.com/journal/12239

Subject/Index Terms

• TRT Terms: Fatigue strength; Finite element method; Joints; Loads; Residual stress; Spot welding; Tension; Weldments
• Subject Areas: Design; Highways; Vehicles and Equipment; I91: Vehicle Design and Safety;

Filing Info

• Accession Number: 01545695
• Record Type: Publication
• Files: TRIS
• Created Date: Nov 26 2014 4:01PM