Open Access

ARTICLE

Investigating Creep Performance and Predicting Rupture Time for Rotating FGM Disc under Different Thermal Gradients

K. Khanna^1,2, V.K. Gupta³, S.P. Nigam¹

1 Mechanical Engineering Dept., Thapar University, Patiala-147004, India
2 Corresponding author (Email: kishore.khanna@thapar.edu)
3 Mechanical Engineering Dept., Punjabi University, Patiala-147002, India

Computers, Materials & Continua 2015, 48(3), 147-161. https://doi.org/10.3970/cmc.2015.048.147

Abstract

A mathematical model is developed to describe the steady state creep in a rotating Al-SiC_p disc having a non-linear thickness profile and distribution of SiC particles along the radial direction. The model is used to investigate the effect of imposing three different kinds of radial temperature profiles viz. linear, parabolic and exponential with fixed values of inner and outer surface temperatures, on the creep stresses and strain rates. It is noticed that by increasing the temperature exponent (n_T), the radial stress (over the entire radius) and tangential stress (near the inner radius) increase in the disc. However, the tangential stress decreases near the outer radius. The radial and tangential strain rates in the functionally graded (FG) disc reduce significantly with the increase in exponent n_T. Besides reduction in the magnitude, the distribution of strain rates also become relatively more uniform throughout with the increase in n_T. It is concluded that FG disc operating under exponential temperature profile performs better. It is also revealed that amongst several FG discs operating under radial thermal gradients, with different values of temperature exponent (n_T) but having the same average and fixed outer surface temperature, the FGM disc with lower value of n_T exhibits the maximum creep life.

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Keywords

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