Creep Analysis of a Variable Thickness Rotating FGM Disc using Tresca Criterion

Kishore Khanna; V. K. Gupta; S. P. Nigam

doi:10.14429/dsj.65.8045

Kishore Khanna Mechanical Engineering Department, Thapar University, Patiala
V. K. Gupta Mechanical Engineering Department, Punjabi University, Patiala
S. P. Nigam Mechanical Engineering Department, Thapar University, Patiala

DOI: https://doi.org/10.14429/dsj.65.8045

Keywords: Creep, disc, functionally graded materials, particle gradient, thickness gradient

Abstract

The study investigates steady-state creep in a rotating Al-SiCp disc having different thickness profiles and reinforcement (SiCp) gradients. The disc material is assumed to creep according to threshold-stress based law and yield following Tresca criterion. The stresses and strain rates in the disc are estimated by solving the disc equilibrium equation along with creep constitutive equations. It was observed that on increasing the disc thickness gradient, the radial stress decreases towards the inner radius but increases towards the outer radius, whereas the tangential stress decreases over the entire radius. With the increase in SiCp gradient in the FGM disc, the radial stress increases significantly throughout, however, the tangential stress increases towards the inner radius but decreases towards the outer radius. The strain rates in the disc reduce significantly over the entire disc radius and become relatively uniform with the increase in either disc thickness gradient or reinforcement gradient. Thus, the composite disc having higher thickness and higher reinforcement gradients exhibits lesser distortion.

Defence Science Journal, Vol. 65, No. 2, March 2015, pp.163-170, DOI:http://dx.doi.org/10.14429/dsj.65.8045

Author Biographies

Kishore Khanna, Mechanical Engineering Department, Thapar University, Patiala

Mr Kishore Khanna did ME from Thapar University, Patiala, Punjab, India in CAD/CAM and Robotics. Currently, he is working as an Assistant Professor of Mechanical Engineering at Thapar University, Patiala. His main research area is creep modelling.

V. K. Gupta, Mechanical Engineering Department, Punjabi University, Patiala

Dr V.K. Gupta received his PhD in the area of Applied Mechanics from Thapar University. Presently, he is working as Professor (Mechanical Engineering) at Punjabi University. He has published more than 40 research papers in journals of repute. His research areas are creep modelling, fatigue behaviour of coated components and hard part turning.

S. P. Nigam, Mechanical Engineering Department, Thapar University, Patiala

Dr S.P. Nigam obtained his PhD from University of Roorkee in1979 in Machine Design. He has over 52 yrs of teaching & research experience. Presently, he is working as a Visiting Professor in Mechanical Engineering Department at Thapar University, Patiala. His research interest is in Vibrations and Noise.