Creep Analysis of an Isotropic Rotating Disc in the Presence of Thermal Residual Stress

Thermal residual stresses exist within a body in the absence of external loading or thermal gradients. Processing of the composites often involves cooling from higher temperature resulting in thermal residual stresses in the matrix due to restraint imposed by reinforcements. Thermal residual stresses determinately affect the properties of materials thereby shortening their lifetime. These residual stresses result in different yield stresses in tension and compression, which has led to the application of isotropic Hoffman yield criterion to describe yielding in isotropic materials. During cooling, the alloy around ceramic particles contracts more than the ceramic constituent and thus, there is a compressive thermal residual stress on the ceramic and a tensile thermal residual stress on the surrounding alloy. A part of the matrix residual stress is relaxed by plastic deformation increasing the density of the matrix dislocation, which contributes to the strengthening of the composite.