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An analytical relation between Weibull's and Basquin's laws for smooth and notched specimens and application to constant amplitude fatigue
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Starting from the classical definition of stress-life Wohler curve in the form of Basquin's law, an analytical procedure for the calibration of the four parameters Wohler curve (Weibull's law) for a plain specimen is proposed. The obtained parameters are then adjusted by means of an additional slope factor preserving the inflection point of the curve while changing its slope in order to model the experimental observations in which an increase of the scatter in life prediction is observed when reducing the stress amplitude. The same approach has then been adopted to calibrate the Weibull's law parameters for a notched specimen, and the fitting slope factor has been found to be a value that changes with the material but remains constant with the stress concentration factor. The findings have been validated with existing experimental data on 2024-T3 aluminum alloy and normalized SAE 4130 steel.
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Modeling the Fatigue Behavior of Amorphous Polymers
A linear Maxwell-type model with half-cycle heating predicts Basquin's law with exponent m=3 for amorphous polymers and gives an expression for the prefactor A.
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