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Creep relaxation of non-uniform FGM Rotating discs

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.