Device for predicting fatigue properties at very high number of cycles in metal alloys as well as corresponding computer program product

摘要

Product comprising a computer-usable medium which comprises a computer-readable program code contained therein for calculating a fatigue strength at very high numbers of cycles and / or a fatigue strength in a metal casting, wherein a fatigue life associated with the metal casting is either nonexistent or not easily identifiable, wherein the computer-readable program code in the product comprises: a computer-readable program code portion for causing a computer to determine a fatigue strength of the metal casting, wherein at least one fatigue crack initiation point is assumed or determined to be present there; a computer-readable program code portion for receiving a discontinuity size representative of the at least one fatigue crack initiation point is associated and is determined by direct measurement and / or analytical prediction; a computer-readable program code part for calculating the fatigue strength eit based on a modified stochastic fatigue limit model; anda computer readable program code portion configured to output results calculated by the modified stochastic fatigue endurance model in a machine readable format and / or a human readable format; wherein the computer readable program code portion comprises for calculating very high cycle fatigue strength and / or fatigue limit : Using the equation ln (aiαNf) = C0 + C1 ln (σa − σL) to run the modified stochastic fatigue limit model, where a is the discontinuity and microstructure constituent size, Nf is the fatigue resistance, C0 and C1 are empirical constants, a is a constant in the range between one and is ten, σa is an applied stress, and σL is a measure of fatigue strength.