Hold-Time Effect on Thermo-Mechanical Fatigue Life and its Implications in Durability Analysis of Components and Systems

摘要: Thermo-mechanical fatigue (TMF) resistance of engineering materials is extremely important for the durability and reliability components systems subjected to combined thermal mechanical loadings. However, TMF testing, modeling, simulation, validation, subsequent implementation findings into product design are challenging tasks because difficulties not only in testing but also results interpretation identification deformation failure mechanisms. Under high-temperature severe loading conditions, creep oxidation mechanisms activated time-dependent superimposed cycle-dependent fatigue, making life assessment very complex. In this paper, procedures using flat specimens thermal-fatigue V-shape reported; emphasis given hold-time effects possible underlying The uncertainty nature probabilistic characteristics specimen test data presented. Finally, impact effect on current validation procedure discussed terms virtual assessment.