Constitutive equations for the description of creep and creep rupture behavior of metallic materials at temperatures above 800/sup 0/C
Journal Article
·
· Nucl. Technol.; (United States)
OSTI ID:6026470
At high temperatures, the creep deformation of metallic materials is correlated with the accumulation of creep damage. Creep crack growth leads to a decrease of bearing cross section and an increase in stationary creep. Both variables, creep strain rate and creep damage, are described by a system of coupled differential equations. The solutions of these equations are given for the boundary conditions of creep tests under constant load, for creep rupture behavior, for damage accumulation in the creep region, and for creep-regimed low-cycle fatigue. A general correlation between applied stress, cumulative strain, and cumulative damage is given.
- Research Organization:
- Institut fur Reaktorwerkstoffe kernforschungsanlage Julich, Julich
- OSTI ID:
- 6026470
- Journal Information:
- Nucl. Technol.; (United States), Journal Name: Nucl. Technol.; (United States) Vol. 66:2; ISSN NUTYB
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
BOUNDARY CONDITIONS
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CRACK PROPAGATION
CREEP
DAMAGE
DEFORMATION
DIFFERENTIAL EQUATIONS
ELEMENTS
EQUATIONS
FAILURES
FATIGUE
GAS COOLED REACTORS
GRAPHITE MODERATED REACTORS
HTGR TYPE REACTORS
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MATERIALS TESTING
MATHEMATICAL MODELS
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STRESS ANALYSIS
TESTING
THERMAL DEGRADATION
VERY HIGH TEMPERATURE
210300 -- Power Reactors
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36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
BOUNDARY CONDITIONS
CORRELATIONS
CRACK PROPAGATION
CREEP
DAMAGE
DEFORMATION
DIFFERENTIAL EQUATIONS
ELEMENTS
EQUATIONS
FAILURES
FATIGUE
GAS COOLED REACTORS
GRAPHITE MODERATED REACTORS
HTGR TYPE REACTORS
MATERIALS
MATERIALS TESTING
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
METALS
REACTOR MATERIALS
REACTORS
RUPTURES
STRAIN RATE
STRAINS
STRESS ANALYSIS
TESTING
THERMAL DEGRADATION
VERY HIGH TEMPERATURE