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The Effect of Tensile Strength on the Fatigue Life of Spot-Welded Sheet Steels
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Abstract
Tensile-shear spot-weld specimens were tested to determine the effect of base-metal tensile properties on fatigue life. Four sheet thicknesses (t) were investigated. Base-metal yield strength ranged between 186 and 757 MPa (27 and 110 ksi).
Results showed that fatigue life was independent of base-metal strength for lives greater than 104 cycles. At shorter lives, fatigue performance improved with increasing base-metal strength. For a given cyclic load range, ΔP, fatigue life increased at all lives with increasing sheet thickness (t).
Fatigue results from both this and a previous study were used to develop a spot-weld fatigue design curve relating spot-weld tensile-shear fatigue life to the correlation parameter, ΔE, equal to ΔPΔΘN1/2/t. Weld-nugget rotation, ΔΘN, is a design-dependent variable related to joint stiffness.
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Citation
Davidson, J. and Imhof, E., "The Effect of Tensile Strength on the Fatigue Life of Spot-Welded Sheet Steels," SAE Technical Paper 840110, 1984, https://doi.org/10.4271/840110.Also In
References
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