Elastoplastic behavior of FGM thick-wall spherical pressure vessels under thermomechanical loads

In this article, the exact solution of axisymmetric mechanical and thermal stresses for a thick-wall hollow sphere made of functionally graded material subjected to internal pressure and cyclic temperature gradient is developed in the framework of small deformation theory. Temperature, as function of radial direction, is solved analytically. All the material properties vary radially across the thickness. The sphere is considered to be spherically symmetric. The analytical plastic model is based on von Mises’s yield criterion, its associated flow rule and ideally plastic materialbehavior. In this analysis, the linear kinematic hardening was considered. Under cyclic loading (temperature difference), it was observed that spherical vessels remain elastic under high temperature gradient. Also, the area of Elastic shakedown, is allocated to the large area and then entered the plastic shakedown. In fact, using this procedure, we can predict the behavior of material prior to different loadings.

کلیدواژه ها:

FGM ، Pressure vessels ، Linear kinematic hardening ، cyclic loading