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Bounds on internal state variables in viscoplasticity
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Freed, Alan D. |
| Copyright Year | 1993 |
| Description | A typical viscoplastic model will introduce up to three types of internal state variables in order to properly describe transient material behavior; they are as follows: the back stress, the yield stress, and the drag strength. Different models employ different combinations of these internal variables--their selection and description of evolution being largely dependent on application and material selection. Under steady-state conditions, the internal variables cease to evolve and therefore become related to the external variables (stress and temperature) through simple functional relationships. A physically motivated hypothesis is presented that links the kinetic equation of viscoplasticity with that of creep under steady-state conditions. From this hypothesis one determines how the internal variables relate to one another at steady state, but most importantly, one obtains bounds on the magnitudes of stress and back stress, and on the yield stress and drag strength. |
| File Size | 362263 |
| Page Count | 8 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19930020007 |
| Archival Resource Key | ark:/13960/t9v16zc3m |
| Language | English |
| Publisher Date | 1993-06-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Hypotheses Creep Properties Kinetic Equations Drag Viscoplasticity Yield Strength Magnitude Steady State Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
