Solutions to the problem of thermo-mechanical yielding in functionally graded material cylindrical vessels

Abstract

Generally, in functionally graded material structures, a ceramic material as reinforcing part is distributed in a metallic matrix. These structures benefit the merits of both their metallic and ceramic parts such as the mechanical strength and thermal resistance. An important aspect in the function and study of functionally graded material structures is the effect of temperature. Usually, the resulted thermal stresses are so high that partial failure of structure is inevitable. In this paper, by using of different exact and approximate mathematical models and solution techniques, the yielding of a functionally graded material cylindrical pressure vessel is studied. Different solution techniques such as closed form solution, FE solution of ABAQUS and semi-analytical solution of variable material properties are used. Based on the von Mises and Tresca’s yield criteria, the shape of plastic zone are obtained and compared. The influences of different structural parameters as well as the effect of failure criterion upon the results are studied. Accordingly, some justifications are made regarding the selection of different material parameters or failure models.

Creep of autofrettaged thick-walled FGM cylindrical vessel

“…28 Sadeghian and Ekhteraei-Toussi presented solutions to the problem of thermomechanical yielding in FGM cylindrical vessels. 29 Jahromi et al 30 studied the autofrettage of layered and FG metal-ceramic composite vessels. In the interesting and valuable research work, 31 an optimal combination of autofrettage and shrinkage is investigated for multilayered.…”