Critical experiments, measurements and analyses to establish a crack arrest methodology for nuclear pressure vessel steels. Task 62. Second annual progress report, 1 July 1975 to 30 June 1976
Developments of the theory, the analyses and the materials characterization for assessments of crack arrest in heavy walled nuclear pressure vessels are described. A two-dimensional, dynamic, finite difference analysis of crack propagation and arrest, including inertia forces and thermal stresses is derived. The analysis is used to treat run-arrest events in DCB- and SEN-specimens. Calculations based on the one-dimensional analysis are compared with detailed measurements of run-arrest in two polymeric materials. The agreements between calculations and experiments support the dynamic, energy conservation theory of crack arrest. Implications of a K/sub ID/-crack velocity curve with a negative slope are examined. The quantity K/sub Im/, the minimum propagating crack toughness, is identified as the crack arrest material property for engineering applications. Considerations entering the design of a crack arrest property measuring procedure, including specimen shape, size, thickness and the crack jump are discussed. The influence of side grooves on the propensity for crack branching is examined. Compliance measurements for rectangular DCB-specimens are presented and analyzed. Energy losses arising from damping remote from the crack tip in an A533B steel DCB specimen are described, and classed as negligible. Interactions between test pieces and the loading system are examined. A simplified procedure for measuring K/sub D/-, K/sub m/-, and K/sub a/-values, based on the dynamic analysis of the crack length at arrest is demonstrated. Measurements of K/sub D/ at temperatures in the range (NDT-66)C to (NDT +34)C and for crack velocities in the range 200 ms/sup -1/ to 1000 ms/sup -1/ are presented. The connection between propagating crack toughness values and the rapidly loaded stationary crack toughness K/sub Id/ is examined.
- Research Organization:
- Battelle Columbus Labs., OH (USA)
- OSTI ID:
- 7318115
- Report Number(s):
- BMI-NUREG-1959
- Country of Publication:
- United States
- Language:
- English
Similar Records
Critical experiments, measurements, and analyses to establish a crack arrest methodology for nuclear pressure vessel steels. Quarterly report, January--March 1977
Critical experiments, measurements, and analyses to establish a crack arrest methodology for nuclear pressure vessel steels. Task 62. Eighth quarterly progress report, July--September 1976
Related Subjects
220200* -- Nuclear Reactor Technology-- Components & Accessories
36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
CONTAINERS
CRACKS
FINITE DIFFERENCE METHOD
FRACTURE PROPERTIES
IRON ALLOYS
IRON BASE ALLOYS
ITERATIVE METHODS
MECHANICAL PROPERTIES
NUMERICAL SOLUTION
POWER REACTORS
PRESSURE VESSELS
REACTORS
RESEARCH PROGRAMS
STEEL-ASTM-A508
STEEL-ASTM-A533
STEELS
TWO-DIMENSIONAL CALCULATIONS