Influences of angular deceleration on the thermoelastoplastic behaviors of nonuniform thickness multilayer FGM discs

摘要

In this article, the stresses of a rotating nonuniform thickness disc subjected to a nonlinear temperature field are obtained numerically using the finite difference method. The disc is composed of a number of laminated layers forming a multilayer (sandwich) FGM structure, and each layer has its constant volume fraction. The thermoelastoplastic analyses are conducted based on the von Mises theory. Investigating some key parameters enlightened that the proposed volume fraction distribution can be used to process FGM structures efficiently while bearing in mind the circumferential stress-jumps. The angular speed is assumed to be exponentially decaying with time inducing shear stress that promotes occurrence of plasticity. About 18% of the disc was in the plastic zone during the elastic solution that jumped to 39% by considering the elastoplasticity. Therefore, it has to be considered for accurate investigations. Furthermore, the disc thickness profile and volume fractions have decisive roles on its behaviors.