SYMPOSIA PAPER Published: 01 January 2000
STP14801S

The Technical Basis for ASTM E 1820-98 Deformation Limits on

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ASTM Standard Test Method E 1820-96, “Measurement of Fracture Toughness,” was recently revised (E 1820-98). This revision includes a relaxation of the deformation limits/size requirements that must be satisfied to report a valid value of fracture toughness at instability prior to significant stable crack extension (JC). E 1820-96 required that valid JC values satisfy the following inequality (with an M value of 200). Bb0MJcσflow E 1820-98 relaxes this requirement to M = 100 for all metals and to M = 50 for ferritic steels. In this paper we present results from both finite element analysis and from fracture toughness testing that supports these changes. This evidence demonstrates that JC values meeting the deformation limits of E 1820-98 are specimen-size invariant. Consequently, these values can be applied with confidence in fracture integrity assessments of much larger structures.

Author Information

Kirk, MT
Office of Nuclear Regulatory Research, United States Nuclear Regulatory Commission, Washington, DC
Lott, RG
Westinghouse Electric Co., LLC, Pittsburgh, PA
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Details
Developed by Committee: E08
Pages: 183–205
DOI: 10.1520/STP14801S
ISBN-EB: 978-0-8031-5437-7
ISBN-13: 978-0-8031-2868-2