Behavior of FGM cylindrical tubes under internal pressure and temperature difference

In the present work, according to use FGM because being non-uniform in the space in high temperature environments, it has been used in thin and thick walled cylindrical pressure tubes, which are extensively used in industry. Based on the governing equations, differential equation of stresses is obtained in plastic state that can be widely used in the study of reservoirs behavior in elasto-plastic state. It is discussed on the temperature distribution and stress — strain relationships in the tanks under internal pressure and temperature difference. Properties of these materials are considered as variable parameters function of radius. In this work, effects of these parameters have been investigated on yielding and the yield temperatures and stress changes in during thickness of the tubes. Furthermore shown is tubes structure can be optimized by choosingappropriate parameters.