Models of damage accumulation during repeated mechanical actions of unregulated factors

A survey of the literature on reliability showed that the breakdown of components that have experience repeated load is mainly studied in terms of the fatigue characteristics of materials. Calculations of the reliability indices of these components are based on using the dependence of fatigue life on load. It has been noted that the endurance limit can depend in different ways on the way the load varies with time. A load can be applied in the following ways: 1. The load is applied at known times. In this case, the changes may be periodic. The durations of the cycles are fully known in advance, and the load can be constant or vary from cycle to cycle.