Модель багатоциклового корозійно-втомного пошкодження деталей машин

Abstract

The report is dedicated to a problem of the phenomenological specification statement of corrosive fatigue damage in the small stresses conditions. As the baseline equation usage the E.K.Pochtenny’s equation is offered, which one will to the greatest degree be matched with experimental results in a high-cycle corrosion fatigue conditions for steel specimens and full-scale parts. Also this equation is in a basis of the whole complex of designed methods of an estimation of durability and residual operational life of accountable of members of constructions operating in high-cycle fatigue conditions. The disadvantage of the equation is asymptotically lower branch, coming nearer to endurance strength, of a curve of fatigue, which one in corrosive conditions does not correspond to results of experiments. For overcoming this disadvantage the two-parameter equation for lower branches of a curve of a corrosion fatigue is offered. The calculus of arguments is spent with the help of the system of the nonlinear equations. The result of applying of the equation is showed on an actual example of a pump rods curve of fatigue.