COMPONENT THERMAL LOADS EVALUATION AND LIFE ANALYSIS FOR HIGH TEMPERATURE APPLICATION

ABSTRACT Described is an advanced design method developed to solve engineering problems concerning the lifetime of components under high temperature operational conditions. Necessary parameter of the stress state under these conditions were determined analytically from the measured temperature distributions on the components. For proper stress analysis the precise description of the material deformation behaviour is necessary. It can be assumed that in the case of local stress-strain history the creep deformation caused by stress relaxation processes dominates. Therefore, different cyclic relaxation tests were performed. The test results show that the creep rate under cyclic conditions is strongly history dependent. In the second part of the study, component based effects were examined. It is shown that the consideration of mutual interaction between material behaviour and component based influences can lead to more effective design procedure.