Evaluation of J-R curve testing of nuclear piping materials using the direct current potential drop technique
A method is described for developing J-R curves for nuclear piping materials using the DC Potential Drop (DCPD) technique. Experimental calibration curves were developed for both three point bend and compact specimen geometries using ASTM A106 steel, a type 304 stainless steel and a high strength aluminum alloy. These curves were fit with a power law expression over the range of crack extension encountered during J-R curve tests (0.6 a/W to 0.8 a/W). The calibration curves were insensitive to both material and sidegrooving and depended solely on specimen geometry and lead attachment points. Crack initiation in J-R curve tests using DCPD was determined by a deviation from a linear region on a plot of COD vs. DCPD. The validity of this criterion for ASTM A106 steel was determined by a series of multispecimen tests that bracketed the initiation region. A statistical differential slope procedure for determination of the crack initiation point is presented and discussed. J-R curve tests were performed on ASTM A106 steel and type 304 stainless steel using both the elastic compliance and DCPD techniques to assess R-curve comparability. J-R curves determined using the two approaches were found to be in good agreement for ASTM A106 steel. The applicability of the DCPD technique to type 304 stainless steel and high rate loading of ferromagnetic materials is discussed. 15 refs., 33 figs.
- Research Organization:
- David W. Taylor Naval Ship Research and Development Center, Annapolis, MD (USA)
- OSTI ID:
- 5479902
- Report Number(s):
- NUREG/CR-4540; ON: TI86901744
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
42 ENGINEERING
NUCLEAR POWER PLANTS
PIPES
STAINLESS STEEL-304
MATERIALS TESTING
STEEL-ASTM-A106
CRACK PROPAGATION
CRACKS
EVALUATION
MATHEMATICAL MODELS
REACTOR MATERIALS
ALLOYS
CARBON STEELS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
NICKEL ALLOYS
NUCLEAR FACILITIES
POWER PLANTS
STAINLESS STEELS
STEELS
TESTING
THERMAL POWER PLANTS
220200* - Nuclear Reactor Technology- Components & Accessories
360103 - Metals & Alloys- Mechanical Properties
420500 - Engineering- Materials Testing