A Reaction-Rate Treatment of the Life Fraction Hypothesis in Creep Testing

[+] Author and Article Information
M. Grounes

Structural Materials Laboratory, Aktiebolaget Atomenergi, Studsvik, Nykoping, Sweden

J. Basic Eng 91(1), 56-58 (Mar 01, 1969) (3 pages) doi:10.1115/1.3571027 History: Received October 07, 1968; Online November 03, 2011


The equation describing Robinson’s life fraction hypothesis has been derived from a generalized equation based on chemical reaction-rate theory. It is shown what further assumptions are needed in order to make this hypothesis valid. For design considerations the following equation is suggested

where tj = time spent at Tj , σj ; taj = time needed to rupture, etc., at Tj , σj ; k = empirical parameter, smaller than 1. The selection of a numerical value for k is based on an analysis of how conventional creep data comply with various assumptions made in the derivation of the equation; T = temperature; and σ = stress.

Copyright © 1969 by ASME
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