Elastic Follow-up Behavior in Power Law Type Inelastic Bodies and Simplified Assessment Mgthods of Peak Strain and Peak Stress Relaxation Due to Displacement-Controlled Loading

In the assessment of structural integrity and remaining life of a power component operated at high temperatures, creep-fatigue damage evaluation is frequently required. When evaluating creep-fatigue damage, peak strain range and relaxation history of peak stress in the component are needed to estimate. These stresses and strains are, in many cases, generated by secondary stresses. Fully inelastic finite element stress analysis may provide the necessary information on these. Performance of and preparations for this kind of analysis are, however, usually laboring and costly. This paper in vestigates elastic follow-up behaviors in components subjected to displacement-controlled loading, and proposes simplified methods to assess peak strain and relaxation history of peak stress basically from elastic stress analysis. The methods are based on the nature of elastic follow-up factors of power law type inelastic bodies.