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Viscoplasticity based on total strain. The modelling of creep with special considerations of initial strain and aging

Journal Article · · J. Eng. Mater. Technol.; (United States)
DOI:https://doi.org/10.1115/1.3443706· OSTI ID:5681545
A previously proposed theory is specialized for the uniaxial state of stress and its prediction for creep and relaxation is analyzed in detail. Constant true stress and constant load creep tests are simulated in the presence and absence of thermal aging together with the constant strain relaxation test. The signs of the creep rate and its time derivative as well as the relaxation rate and its time derivative are introduced as criteria. The constant load creep test can reproduce the normal creep curves and nonclassical creep curves (epsilon-. > 0; epsilon-.. > 0 for all epsilon and for sigma/sub 0/ > 0). The capabilities of the constant true stress test are limited to primary creep if the work-hardening slope is positive. When aging is introduced almost any creep curve can be reproduced in both tests. The importance of initial strain is discussed and demonstrated by room temperature creep tests on Type 304 Stainless Steel. It is suggested that the initial strains together with the creep curves be reported in the future. Poisson's ratio in creep needs to be measured and tests are proposed which will enable a quantitative assessment of aging.
Research Organization:
Rensselaer Polytechnic Inst., Troy, NY
OSTI ID:
5681545
Journal Information:
J. Eng. Mater. Technol.; (United States), Journal Name: J. Eng. Mater. Technol.; (United States) Vol. 101:4; ISSN JEMTA
Country of Publication:
United States
Language:
English

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Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200104 -- Fossil-Fueled Power Plants-- Components
36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
AGING
ALLOYS
ANNEALING
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CREEP
DEFORMATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HEAT TREATMENTS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
NICKEL ALLOYS
POWER PLANTS
STAINLESS STEEL-304
STAINLESS STEELS
STEELS
STRAINS