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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.
state variables, evolution equation, flow equation, inelastic response, mechanical properties, René 95 at 650°C
Professor, University of Cincinnati, Cincinnati, Ohio
Professor, Faculty of Mechanical Engineering, Technion — Israel Institute of Technology, Haifa,