Effect of Temperature and Particle Distribution on Creep Behavior of FGM Rotating Discs

Rotating discs have been used in numerous industrial machineries. In most of these applications discs are worked at high temperatures and high rotational speeds. Such a working conditions lead to the more sever thermo-mechanical stresses in rotating discs. In this situation of high temperature and stress the creep phenomenon is the most important and it can impose the irreversible damages to structure. Therefore it is important to investigate the creep behavior in rotating discs. Studies have shown that the creep is entirely dependent on the material structure. In recent years using of a new type of material called functionally graded materials (FGM) has been expanded continuously. Nowadays the functionally graded materials are used in construction of various component of machinery including rotating discs because of their spatial benefits. As a result the creep analysis in FGM rotating discs is a valuable problem. In this paper the rotating discs steady state creep equations are extracted and the effect of particle distribution and threshold volume fraction as well as prevailing temperature on the creep rates and stress fields of FGM rotating disc are investigated.