An optimal experiment planning in the problem of longevity evaluation at crack propagation stage

Abstract

Abstract A large number of factors influencing the fatigue crack rate are traditionally studied separately. In this case, their interactions are not taken into account, and the experiment does not possess the property of optimality. The article describes the authors’ vision of the problem, how it would be possible to approach the solution of the research problem from the point of view of the theory of optimal experiment planning. Initially, it is proposed to consider three basic factors, namely: the influence of loading asymmetry, loading frequency and sequence of overloads. A full factorial experiment with varying factors at extreme levels is considered. The formalization of the factors describing the sequence of overloads is proposed.