Experimental and Numerical Investigations on Creep Damage Evolution

摘要

New approaches for life time assessment of high temperature components are based on the description of changes in the microstructure of materials e.g. the formation and growth of cavities. In order to get reliable results using such approaches it is important to obtain a quantitative relationship between parameters like cavity density describing damage situation and stress and deformation state. If life time consumption of components is considered, it is necessary to take into account the actual stress state. It is well known that there is a reduction in deformation capability of a material, but there is little knowledge of the influence of the stress state on the time dependent evolution of creep damage.