The Shape of Creep Curves

[+] Author and Article Information
J. Glen

Central Research Department, Colvilles Ltd., Motherwell, Scotland

J. Basic Eng 85(4), 595-600 (Dec 01, 1963) (6 pages) doi:10.1115/1.3656918 History: Received July 31, 1962; Online November 03, 2011


The scatter of results in long time creep or rupture tests is such that the strongest sample can sustain a stress at least 50 percent higher than the weakest sample. A large part of this scatter is associated with metallurgical variations in steel. Starting with the assumption that a pure metal of given grain size has a clearly defined shape of creep curve at a given stress and temperature, it is shown that strain aging and precipitation phenomena complicate the shape of the creep curve. A number of examples of these phenomena are discussed showing the great importance of strain age hardening in relation to scatter.

Copyright © 1963 by ASME
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