A fatigue design parameter for spot welds
The development of fatigue cracks in galvanized low carbon and high-strength-low-alloy tensile-shear-spot weldments was investigated using the AT & T Microhmeter. The boundaries between the three stages of the fatigue life were determined based on the resistivity measurements of the Microhmeter. Subsequently, the effects of sheet thickness, specimen width, and nugget diameter on the total fatigue life as well as its stages were studied. Sheet thickness was found to have the largest effect on fatigue life while the nugget diameter had the least. The galvanized low carbon tensile-shear specimens outperformed the corresponding high-strength-low-alloy specimens in the long life regime.
University of Illinois - Urbana-Champaign
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University of Illinois at Urbana-Champaign