Evaluation and Development of Constitutive Relations for Inelastic Behavior.
Abstract
A review and critical assessment of the major theoretical developments in plastic and viscoplastic constitutive theory, as well as a brief survey of recent related experimental and computational advances is given. The very large number of thermoplastic and thermoviscoplastic theories that are currently being proposed stems largely from the presently unsettled state of the underlying theory of nonequilibrium thermodynamics, and also from the ambiguousness that surrounds the added use of the internal state variable formalism as a theoretical tool in constitutive theory formulation.The use of the generalized continua, that is, continua with different formally defined internal structure as background for constitutive theory development does not, after approximately thirty years of activity, appear to have been fruitful, and seems to hold little promise for future useful applications. The advances that have occurred in experimental equipment and techniques, including the development of computer-controlled servohydraulic testing systems and various new areas of experimentation, are also reviewed. These areas include the measurement of initial and subsequent yield surfaces, time and temperature effects, strain rate effects, cyclic loading and finite strain considerations. The dramatic advances in computational capabilities and in techniques necessary to use computers in solving practical problems are also reviewed. Originator furnished key words include: Constitutive Equations, Plasticity, Viscoplasticity.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1983
- Accession Number
- ADA150491
Entities
People
- D. L. Jones
- J. Eftis
Organizations
- George Washington University