SYMPOSIA PAPER Published: 01 January 1991
STP16849S

A Fracture Instability Data Qualification Limit

Source

The purpose of this work was to identify a fracture instability data qualification limit. Transition regime fracture data were sorted to disqualify those higher Jmax valued fracture instability data which had exhibited significant prior stable crack extension. Qualified data were identified as having Jmax values below the JIc scatterband. Disqualified data had more than double the average prior stable crack extension of qualified data and had Jmax values in or above the JIc scatterband. The higher Jmax values and significant crack extension of disqualified data appeared to have been associated with a loss of constraint. The data indicated that a specimen size requirement may be needed for elastic-plastic fracture instability data that is different from those for elastic fracture instability or elastic-plastic tearing onset data. However, the value of Jmax relative to the JIc scatterband seems more to the point of identifying data that undergo fracture instability prior to significant crack extension.

Author Information

Macdonald, BD
General Electric Company, Schenectady, NY
Oberdick, RH
General Electric Company, Schenectady, NY
Hiser, AL
U.S. Nuclear Regulatory Commission, Washington, DC
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Details
Developed by Committee: E08
Pages: 102–113
DOI: 10.1520/STP16849S
ISBN-EB: 978-0-8031-5172-7
ISBN-13: 978-0-8031-1418-0