Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 47 2 2016 01 21 Behavior Of FGM Spherical Vessels Under Internal Pressure and Temperature Difference Behavior Of FGM Spherical Vessels Under Internal Pressure and Temperature Difference 45 52 375 10.22060/mej.2016.375 FA Saeid Ansari Sadrabadi Ali Nayebi Gholamhosin Rahimi Journal Article 2012 06 02 In this paper, FGMs  are used as non-uniform materials in high temperature environments. Different industries use them in thin and thick walled spherical pressure vessels. Based on 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. The study has discussed on 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, yield temperatures and stress changes in thickness of the vessels. Furthermore, it is shown that vessels structure can be optimized by choosing appropriate parameters. In this paper, FGMs  are used as non-uniform materials in high temperature environments. Different industries use them in thin and thick walled spherical pressure vessels. Based on 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. The study has discussed on 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, yield temperatures and stress changes in thickness of the vessels. Furthermore, it is shown that vessels structure can be optimized by choosing appropriate parameters. https://mej.aut.ac.ir/article_375_f61d6947467ccd3aa5af24db320235dd.pdf