A Simplified Orthotopic Viscoplasticity Theory Based on Overstress
A small strain, unified theory is formulated without yield surfaces and loading/unloading conditions. It contains one tensor valued state variable for which an orthotropic growth law is formulated. Rate sensitivity, creep, relaxation as well as tension/compression asymmetry can be reproduced. A special selection of the material constants permits the modeling of elastic behavior in one direction with viscoplastic behavior in directions perpendicular to it.
KeywordsElastic Behavior Equilibrium Stress Rensselaer Polytechnic Institute Viscosity Function NASA Lewis Research
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- 1.M. Sutcu, “An Orthotropic Formulation of the Viscoplasticity Theory Based on Overstress,” PhD Thesis, Rensselaer Polytechnic Institute, Troy, New York, December 1985.Google Scholar
- 2.R. M. Jones, Mechanics of Composite Materials, McGraw-Hill Book Company, Washington, DC (1975).Google Scholar
- 4.E. Krempl, “Models of Viscoplasticity. Some Comments on Equilibrium (Back) Stress and Drag Stress,” Acta Mechanica, in press.Google Scholar
- 5.M. Sutcu and E. Krempl, “A Simplified Orthotropic Viscoplasticity Theory Based on Overstress,” Rensselaer Polytechnic Institute Report MML 87-8, September 1987.Google Scholar
- 6.E. Krempl and B.-Z. Hong, “A Simple Laminate Theory Using the Orthotropic Viscoplasticity Theory on Overstress. Part I: In Plane Stress-Strain Relations for Metal Matrix Composites,” Rensselaer Polytechnic Institute Report MML87-9, September 1987.Google Scholar