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Refinement and Verification of the Structural Stress Method for Fatigue Life Prediction of Resistance Spot Welds Under Variable Amplitude Loads
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 03, 2000 by SAE International in United States
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The work presented here builds on the practical and effective spot weld fatigue life prediction method, the structural stress method (SSM), that was developed at Stanford University. Constant amplitude loading tests for various spot weld joint configurations have been conducted and the SSM has been shown to accurately predict fatigue life.
In this paper refinements to the structural stress approach are first presented, including a variable amplitude fatigue life prediction method based on the SSM and Palmgren-Miner's rule. A test matrix was designed to study the fatigue behavior of spot welds under tensile shear loading conditions. Constant amplitude tests under different R-ratios were performed first to obtain the necessary material properties. Variable amplitude tests were then performed for specimens containing single and multiple welds. Experimental and finite element data are then compared in order to illustrate the ability of the SSM to include load ratio effects and predict life for variable amplitude loading. Finally, test data and life predictions based on the SSM for specimens of mixed material and mixed thickness are presented.
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CitationSheppard, S., Pan, N., Bai, Z., and Sheu, Y., "Refinement and Verification of the Structural Stress Method for Fatigue Life Prediction of Resistance Spot Welds Under Variable Amplitude Loads," SAE Technical Paper 2000-01-2727, 2000, https://doi.org/10.4271/2000-01-2727.
- Sheppard S. D. “Further Refinement of a Methodology for Fatigue Life Estimation in Resistance Spot Welds,” ASTM STP 1292, Advances in Fatigue Lifetime Prediction Techniques Mitchell M.R. Landgraf R.W. 265 282 1995
- Pan N. Sheppard S. “An Enhancement to the Structural Stress Method for Fatigue Life Prediction,” International Journal of Fatigue
- Roark R. Young W. Formulas for Stress and Strain McGraw-Hill Book Company 5tth 1975
- Pan N. Fatigue Life Prediction of Spot Welds Stanford University 2000
- Pan N. Sheppard S. “The Effect of R-Ratio on Fatigue Response of Resistance Spot Welded Joints,” ASTM STP 1332 29th Fatigue Fracture Mechanics Feb. 1999
- Miner M. “Cumulative damage in fatigue,” Journal of Applied Mechanics 12 A159 164 1945
- Palmgren A. Ball and Roller Bearing Engineering SKF Industries, Inc. 1945
- Wetzel R. Fatigue Under Complex Loading SAE 1977
- Pan N. Sheppard S. “Spot Weld Fatigue Life Prediction with Cyclic Strain Range,” Fatigue and Fracture of Engr. Materials & Structures