A comparison of Weibull and. beta. sub Ic analyses of transition range data

Conference · Tue Jan 01 04:00:00 EST 1991

OSTI ID:6002917

McCabe, D E

Specimen size effects on K{sub Jc} data scatter in the transition range of fracture toughness have been explained by external (weakest link) statistics. In this investigation, compact specimens of A 533 grade B steel were tested in sizes ranging from 1/2TC(T) to 4TC(T) with sufficient replication to obtain good three-parameter Weibull characterization of data distributions. The optimum fitting parameters for an assumed Weibull slope of 4 were calculated. External statistics analysis was applied to the 1/2TC(T) data to predict median K{sub Jc} values for 1TC(T), 2TC(T), and 4TC(T) specimens. The distributions from experimentally developed 1TC(T), 2TC(T), and 4TC(T) data tended to confirm the predictions. However, the extremal prediction model does not work well at lower-shelf toughness. At {minus}150{degree}C the extremal model predicts a specimen size effect where in reality there is no size effect.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: NRC; Nuclear Regulatory Commission, Washington, DC (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6002917
• Report Number(s): CONF-910624-5; ON: DE92002802
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CARBON STEELS
FRACTURE MECHANICS
FRACTURE PROPERTIES
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
MATHEMATICS
MECHANICAL PROPERTIES
MECHANICS
SIZE
STATISTICS
STEEL-ASTM-A533-B
STEELS
TESTING