Predicting The Durability Of Machine Parts On The Basis Of Nonstandard Physicomechanical Parameters Of Structural Materials

摘要

A method based on the relation between thefatigue strength of metallic structural material (the slope of thefatigue curve to the cycle axis) and the damage to the surface,determined on the basis of slip bands, permits ongoing andrelatively accurate prediction of the fatigue strength anddurability of machine parts of any size and shape, at variousloading frequencies and in the presence of load asymmetry,taking account of the influence of temperature and stressconcentration. Within this approach, the difference between theproperties of the material at the surface of the part and withinthe volume may be taken into account, as well as the realbehavior of the metal in cyclic deformation. Computerimplementation of this method permits not only the estimationof the fatigue strength and durability but also ongoingmultivariant calculations to elucidate the influence of variousfactors on the fatigue strength and durability of the part. Themathematical apparatus underlying the method potentiallyallows an infinite number of factors acting on the material to betaken into account, as well as their mutual weakening orreinforcement when they act together.