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ABSTRACT
Normally it may happen that an FGM disc with linear distributions of radial particle content is subjected to severe operating temperature and high rotational speed. In such conditions the incidence of creep is inevitable. To study some aspects of this phenomenon, using the Sherby’s law the creep relaxation of a group of various thickness FGM rotating discs is modelled. Results show the shape of a disc is an important factor which controls the stress field and consequently the deformation and life expectancies. It is seen that there is a definite speed in which the creep relaxation of the rotating disc has vanished. This important rotational speed is named the creep limit speed. The analysis suggests that setting this speed as the working speed can reduce the disc creep working problems. The effect of disc profile on creep limit speed, creep rate distribution and stress fields is studied using some case studies.
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Hodais Zharfi
Hodais Zharfi received the B.S. degree in mechanical engineering from the Ferdowsi University of Mashhad, Mashhad, Iran, in 2007, the M.S. degree in mechanical engineering from Semnan University, Semnan, Iran, in 2010 and Ph.D. degrees in mechanical engineering from Ferdowsi University of Mashhad, Mashhad, Iran, in 2016. She is currently an Assistant Professor with the Department of Mechanical Engineering, Esfarayen University of Technology. Her current research interests include computational mechanics, mechanics of composite materials, creep mechanic, smart materials and active vibration control.