Abstract

Elastic-plastic transitional stresses in an isotropic disc having variable thickness under internal pressure have been derived by using Seth’s transition theory. The effect of stresses in fully-plastic state for different values of k presented graphically and discussed. Disc made of compressible material and having variable thickness yields at some radius R₁ at a higher pressure as compare to disc made of incompressible material which yields at the outer surface. Flat disc made of incompressible material yields at internal surface at higher pressure as compare to disc made of compressible material. Circumferential stress is maximum at the outer surface of the disc having variable thickness.

Key words: Elastic-plastic, transition, isotropic, thickness, pressure.