Published: Jan 2000
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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).
fracture toughness testing, cleavage fracture toughness, deformation limits, size requirements, JC, constraint, ferritic steels
Senior materials engineer, Office of Nuclear Regulatory Research, United States Nuclear Regulatory Commission, Washington, DC
Advisory engineer, Westinghouse Electric Co., LLC, Pittsburgh, PA