SEDL / STP / STP765-EB / STP28890S

A Relationship Between Theory and Experiment for a State Variable Constitutive Equation

Stouffer, DC
Professor, University of Cincinnati, Cincinnati, Ohio

Bodner, SR
Professor, Faculty of Mechanical Engineering, Technion — Israel Institute of Technology, Haifa,

Pages: 12    Published: Jan 1982

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Abstract

A state variable constitutive equation that can be solved for the state variables can then be used to calculate the state variable histories from the stress and strain histories observed during an experiment. This was done using the Bodner-Partom flow equation for wrought René 95 at 650°C. The evolution equation was determined for a state variable that characterizes the resistance to plastic flow, and some properties of a damage state variable were established. Analysis of the tensile and creep data suggested that two different mechanisms were active during deformation. A limited number of experimental results were compared with the response calculated from the flow and evolution equations.