Creep of a Hollow Sphere

[+] Author and Article Information
T. Sakaki, K. Sugimoto

Department of Mechanical Engineering, Tokyo Metropolitan University, Fukazawa 2-1-1, Setagaya-ku, Tokyo 158, Japan

T. Kuroki

Tokyo Metropolitan University, Fukazawa 2-1-1, Setagaya-ku, Tokyo 158, Japan

J. Appl. Mech 57(2), 276-281 (Jun 01, 1990) (6 pages) doi:10.1115/1.2891985 History: Received March 18, 1988; Revised April 10, 1989; Online March 31, 2008


Using internal stress arising from a spherically symmetric, finite plastic strain, creep of a hollow sphere subjected to inner and outer pressures, and also thermal stress, is discussed. If computer-aided numerical calculation method is used, creep is easily followed up to a finite plastic strain range including initial transient creep, whatever type of creep law is employed. If assumed in a steady state, creep rate, stress, small plastic strain leading to a stress state in steady creep, and another small plastic strain relaxing thermal stress are analytically obtained. Numerical method is also applicable to creep relaxation. Further, the origin of residual stress after unloading is clarified.

Copyright © 1990 by The American Society of Mechanical Engineers
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