โ Scribed by V.V. Panasyuk; O.P. Datsyshyn; H.P. Marchenko
No coin nor oath required. For personal study only.
A model to calculate the fatigue life (residual durability) of solids under rolling contact, which is based on the concepts of linear fracture mechanics, has been proposed. The construction of a crack growth path in one of the bodies of a contacting pair, using applicable criteria of local fracture, equations of crack growth rate and characteristics of cyclic crack growth resistance of the material, is a key element of the model. The rolling body is modelled by a half-plane and the contact interaction of the bodies in every rolling cycle is simulated by repeated translation motion of normal and tangential forces along the half-plane edge, which are distributed on the contact area by a certain law. The calculations of the path and stress intensity factors along it are carried out by the step-by-step process on the basis of the singular integral equations method. Edge crack growth paths have been investigated and the residual durability of the rolling surface of 75XFCT steel has been estimated.
๐ SIMILAR VOLUMES
Crack propagation is considered as a random walk process of consecutive atomic bond breaking and healing steps. The total number of steps is propo~ion~ to tfre propa~t~n time, and the difference of the number of breaking and healing steps is propo~ional to the location of the crack tip at that time.