Experimental Verification of Constitutive Equations for Creep and Plasticity Based on Overlay Models

[+] Author and Article Information
P. Meijers

Laboratory of Engineering Mechanics, Delft University of Technology, Delft, The Netherlands

F. Roode

TNO-Institute for Mechanical Constructions, Delft, The Netherlands

J. Pressure Vessel Technol 105(3), 277-284 (Aug 01, 1983) (8 pages) doi:10.1115/1.3264279 History: Received July 08, 1982; Revised April 26, 1983; Online November 05, 2009


A general description of creep and plastic deformation based on overlay models is presented. This includes the description of time effects during plastic deformation at room temperature. A detailed procedure to obtain the model parameters is also discussed. The description has been evaluated for a large number of uniaxial and biaxial load histories on thin walled tubes. The materials involved are a 2 1/4 Cr-1 Mo steel stabilized with Niobium (WN 1.6770) and a 304 stainless steel (WN 1.4948). The theoretical predictions of the plastic deformations are found to be sufficiently accurate. The evaluation of the phenomenological description for creep shows a fairly good agreement with the real creep deformation process. Special attention requires the description of softening due to microstructural changes.

Copyright © 1983 by ASME
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