Summary
Unified constitutive models, which do not postulate separate constitutive equations for creep and plasticity but consider all inelastic deformation rate dependent, have been applied to the modeling of transient and cyclic short—term deformation behavior. Their application to modeling long—term creep has been demonstrated in principle and hinges on the introduction of recovery terms in the growth laws for the state variables. After postulating a set of phenomenological indicators of recovery the viscoplasticity theory based on overstress (VBO) for small strain is introduced and the growth law for each of two state variables is augmented by a recovery term. Hypothetical, but realistic material properties are postulated and numerical experiments are performed to simulate the tests which were previously designated as indicators of significant recovery. The results show that each state variable has specific effects and that recovery terms in both state variables are needed to reproduce the significant phenomena.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Pineau, A.: Personal communication, September 1990.
Krempl, E., McMahon, J.J., Yao, D.: Viscoplasticity based on overstress with a differential growth law for the equilibrium stress. Mechanics of Materials 5 (1986) 35–48.
Yao, D., Krempl, E.: Viscoplasticity theory based on overstress. The prediction of monotonic and cyclic proportional and nonproportional loading paths of an Aluminum alloy. Int. J. of Plasticity 1 (1985) 259–274.
Lee, K.D., Krempl, E.: An orthotropic theory of viscoplasticity based on overstress for thermomechanical deformations, in press Int. J. of Solids and Structures.
Nishiguchi, I., Sham, T.L., Krempl, E.: A finite deformation theory based on overstress. Parts I and II, in press Journal of Applied Mechanics.
Krempl, E., Choi, S.H.: Viscoplasticity theory based on overstress: The modeling of ratchetting and cyclic hardening of type 304 stainless steel, Rensselaer Polytechnic Institute Report MML 90-4, April 1990, submitted to Nuclear Engineering and Design.
Majors, P.S., Cheng, S., Ruggles, M.B., Krempl, E.: The rate(time)-dependent mechanical behavior of modified 9Cr-lMo alloy at 538°C and its modeling using the viscoplasticity theory based on overstress, Rensselaer Polytechnic Institute Report MML 90-5, August 1990.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1991 Springer-Verlag, Berlin Heidelberg
About this paper
Cite this paper
Krempl, E., Majors, P.S. (1991). Modeling of Recovery of State Using the Viscoplasticity Theory Based on Overstress. In: Życzkowski, M. (eds) Creep in Structures. International Union of Theoretical and Applied Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-84455-3_15
Download citation
DOI: https://doi.org/10.1007/978-3-642-84455-3_15
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-84457-7
Online ISBN: 978-3-642-84455-3
eBook Packages: Springer Book Archive