Review of proposed failure criteria for ductile materials
In this report, failure criteria for structural components constituting the primary coolant-system boundary of a Liquid Metal Fast Breeder Reactor (LMFBR) are reviewed. Because the materials being considered, mild ferritic steel and austenitic stainless steels, are ductile, especially under LMFBR normal operating and accident conditions, only ductile criteria are considered. The ductile criteria must be used in combination with true stress and strain measures of deformation and internal load. Specific criteria reviewed include maximum stress and strain or plastic instability based on uniaxial tensile-test data and a hole-growth theory based on coalescence of neighboring voids under load. Criteria based only on maximum stress or strain are not recommended for general use because they are not appropriate under general, multiaxial stress conditions. The plastic instability criterion, because it leaves a large unused toughness region before fracture, is recommended where considerable conservatism is warranted. The hole-growth criterion is recognized as being analytically sound; however, it has not been extended to general three-dimensional geometry and multiaxial stress conditions. The theory needs to be substantiated with experimental data for specific materials being considered.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 7142886
- Report Number(s):
- NUREG/CR-3644; LA-10007-MS; ON: DE84011211
- Country of Publication:
- United States
- Language:
- English
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ACCIDENTS
ALLOYS
BREEDER REACTORS
DAMAGE
EPITHERMAL REACTORS
FAILURES
FAST REACTORS
FBR TYPE REACTORS
FRACTURES
IRON ALLOYS
IRON BASE ALLOYS
LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
MATERIALS
MECHANICAL PROPERTIES
PLASTICITY
REACTOR ACCIDENTS
REACTORS
STEELS
STRAINS