Creep behavior of beams using the viscoplasticity theory based on total strain and overstress
The viscoplasticity theory based on total strain and overstress can reproduce rate-dependent inelastic deformation without distinction between plastic and creep strain using two material functions. A viscosity function and an equilibrium stress-strain curve characterize rate-dependency and work hardening, respectively. The theory is used to analyze the creep behavior of a beam subjected to a linearly increasing moment which is subsequently held constant. The analysis shows the existence of two possible states of equilibrium: termination of primary creep or secondary creep. They occur when the equilibrium stress-strain curve has positive or zero slope in the plastic strain range. The numerical experiments illustrate that the stress distribution at the end of the moment increase depends on the moment rate. The rate effects disappear with time when stress is redistributed. The equilibrium solution is obtained before 10/sup 7/ sec, when the material functions representing AISI Type 304 Stainless Steel at room temperature are used. The other equilibrium solution (secondary creep) is reached after primary creep when the constant moment is above the limiting equilibrium moment which corresponds to the plastic hinge moment of plasticity theory. The stress distribution during stationary creep is shown to be the solution corresponding to the Norton Law of creep theory.
- Research Organization:
- Department of Mechanical Engineering Aeronautical Engineering and Mechanics, Rensselaer Polytechnic Institute, Troy, New York
- OSTI ID:
- 5559875
- Report Number(s):
- CONF-820601-
- Journal Information:
- Am. Soc. Mech. Eng., Pressure Vessels Piping Div., (Tech. Rep.) PVP; (United States), Journal Name: Am. Soc. Mech. Eng., Pressure Vessels Piping Div., (Tech. Rep.) PVP; (United States) Vol. PVP-VOL. 60; ISSN AMPPD
- Country of Publication:
- United States
- Language:
- English
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360103* -- Metals & Alloys-- Mechanical Properties
42 ENGINEERING
420200 -- Engineering-- Facilities
Equipment
& Techniques
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CREEP
ELASTICITY
HARDENING
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
NICKEL ALLOYS
PLASTICITY
STAINLESS STEEL-304
STAINLESS STEELS
STEELS
STRAINS
STRESSES
STRUCTURAL BEAMS
TENSILE PROPERTIES
VISCOSITY