Effect of cyclic and static stresses on cyclic creep of heat resistant nickel alloys under multicycle loading

The process of cyclic creep of heat-resistant nickel alloys under asymmetric multicycle loading is studied as affected by cyclic σsub(a) and static σsub(m) stresses. It is stated that an increase in cyclic σsub(a) and static σsub(m) stresses produces a decrease in the life time of materials studied, thus essentially rising cyclic creep rate epsilonsub(μ)(t). It is shown that dependence of the minimum cyclic creep rate epsilon''sub(μ) on the static component σsub(m) is fairly approximated by a power or exponential dependences, the dependence mentioned on the cyclic component σsub(a) is approximated by an exponential one