Application of the key curve method to determining J-R curves for A533B steel

Technical Report · Fri Feb 01 00:00:00 EST 1980

DOI:https://doi.org/10.2172/5492072· OSTI ID:5492072

Joyce, J A

The experimental development is described of a key curve for compact specimens of A533B steel and the use of this experimental key curve to generate the J-Resistance curve directly from the load displacement records without obtaining crack length estimates from unloading compliance, ultrasonics, electric potential or other techniques. Two complete key curve functions were developed, the first using subsized fatique precracked specimens, the second using subsized but machine notched specimens. In each case eight 1/2 T compact specimens with crack lengths from a/W = 0.5 to 0.9 were used to generate a series of digital load displacement records which were assembled in a computer file as the key curve for geometrically similar compact specimens. This key curve can be thought of as defining the locus of load displacement records expected for geometrically similar compact specimens of this material for similar loading conditions if no crack extension were to take place. Deviations between the key curve function and the load displacement record for a particular specimen can then be attributed to crack extension and a calculation for the amount of crack extension can be made. The key curve also allows corrections to be made to J values to account for effects of this crack extension.

• Research Organization: Naval Academy, Annapolis, MD
• OSTI ID: 5492072
• Report Number(s): NUREG/CR-1290; TRN: 80-005696
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
STEEL-ASTM-A533-B
TEARING INSTABILITY
CHEMICAL COMPOSITION
COMPUTER CALCULATIONS
CRACKS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
TENSILE PROPERTIES
ALLOYS
CARBON STEELS
INSTABILITY
IRON ALLOYS
IRON BASE ALLOYS
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
STEELS
360103* - Metals & Alloys- Mechanical Properties