Vol.19, No.3, 2019, pp. 167–174
UDC:

In the present work, an effort has been made to study the creep response in the isotropic/anisotropic FGM disc with constant thickness made of aluminium alloy based metal matrix composite containing silicon carbide particles in the presence of thermal gradients in the radial direction. The thermal gradient experienced by the disc is the result of breaking action as estimated by finite element method. The steady state creep behaviour of disc is analysed by Sherby’s constitutive model. The creep response of rotating disc is expressed by a threshold stress with stress exponent value of 8. The creep parameters characterizing difference in yield stresses have been used from the available experimental results in literature. The results indicate that the stress and strain distributions in an isotropic/anisotropic rotating FGM disc are affected by thermal gradients. It is concluded that for designing a functionally graded material disc (FGM), the presence of thermal gradients needs attention from the point of view of steady state creep and the creep response in isotropic/anisotropic discs operating under thermal gradients are observed to be significantly lower than those observed in a disc without thermal gradients.

Keywords: modelling, composites, creep, thermal gradient