Specimen size effects in Charpy impact testing
Full-size , half-size, and third-size specimens from several different steels have been tested as part of an ongoing alloy development program. The smaller specimens permit more specimens to be made from small trail heats and are much more efficient for irradiation experiments. The results of several comparisons between the different specimen sizes have shown that the smaller specimens show qualitatively similar behavior to large specimens, although the upper-shelf energy level and ductile-to-ductile transition temperature are reduced. The upper-shelf energy levels from different specimen sizes can be compared by using a simple volume normalization method. The effect of specimen size and geometry on the ductile-to-ductile transition temperature is more difficult to predict, although the available data suggest a simple shift in the transition temperature due to specimen size changes.The relatively shallower notch used in smaller specimens alters the deformation pattern, and permits yielding to spread back to the notched surface as well as through to the back. This reduces the constraint and the peak stresses, and thus the initiation of cleavage is more difficult. A better understanding of the stress and strain distributions is needed. 19 refs., 3 figs., 3 tabs.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6896247
- Report Number(s):
- CONF-8911193-1; ON: DE90011369; TRN: 90-016544
- Resource Relation:
- Conference: Symposium on Charpy impact test: factors and variables, Orlando, FL (USA), 8-9 Nov 1989
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
THERMONUCLEAR REACTOR MATERIALS
CHARPY TEST
DUCTILE-BRITTLE TRANSITIONS
FERRITIC STEELS
FINITE ELEMENT METHOD
FRACTURES
STRESSES
TENSILE PROPERTIES
TRANSITION TEMPERATURE
ALLOYS
DESTRUCTIVE TESTING
FAILURES
IMPACT TESTS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
NUMERICAL SOLUTION
PHYSICAL PROPERTIES
STEELS
TESTING
THERMODYNAMIC PROPERTIES
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