Vol.17, No.2, 2017, pp.105–112
UDC 62-988:539.319

In this paper, an attempt is made to analyse the thermal stresses in cylindrical vessel made up of functionally graded material subjected to internal and external pressure. The main purpose of this study is to assess the design guidelines of pressure vessels in order to overcome the fracture conditions. The methodology based on transition theory is applied to evaluate the stresses. Stresses for fully plastic state have been discussed with two-zone theory. The thick-walled circular cylinder made up of functionally graded material becomes fully plastic at internal and external surface. This is because initial yielding starts at any radius that lies between the internal and external surface. On the basis of analysis, it can be concluded that the circular cylinder of functionally graded material with thermal effects is on the safer side of the design as compared to the cylinder without thermal effects and also to the homogeneous cylinder with pressure, which leads to the idea of ‘stress saving’ that minimizes the possibility of fracture of the cylinder.

Keywords: thermal loading, elastic-plastic, cylinder pressure vessel, stresses