RELATIONSHIP BETWEEN CHARPY V AND FRACTURE MECHANICS K SUB IC ASSESSMENTS OF A533-B CLASS 2 PRESSURE

A cooperative program between the Naval Research Laboratory and the Westinghouse Nuclear Energy Systems Division was established to explore possible relationships between postirradiation Charpy-V and fracture mechanics (plane-strain fracture toughness) data. Initial efforts centered on a 6 3/8-in. A533 grade B Class 2 steel plate for which the preirradiation condition has been well characterized by Charpy-V, tension, dynamic tear, and fracture mechanics tests. Low (less than 250 F, 121 C) temperature-high fluence exposure conditions were utilized to obtain large Charpy-V, tensile and plane strain fracture toughness property changes over the preirradiation condition. The simultaneous exposure of Charpy-V and 1-in.-thick compact tension (CT) specimens produced comparable increase in the Charpy-V 30 ft-lb transition temperature and the plane-strain fracture toughness 65,000 psi x sq root in. temperature. The Charpy-V shelf energy was reduced from 74 to 46 ft-lb. The postirradiation 75 F (24 C) yield strength was 127.3 ksi compared to a preirradiation value of 74.2 ksi; however, postirradiation yield strength decreased markedly with increasing temperature. The test capacity of the 1-in. CT specimen was found insufficient for ASTM valid plane-strain fracture toughness determinations at the Charpy-V shelf level temperature for pre- or postirradiation conditions. The estimate of postirradiation plane-strain fracture toughness at Charpy-V shelf temperatures would require a CT specimen thickness of at least 5 in. The data suggest that, if power reactor surveillance programs restrict test specimen size to a maximum of 1-in. thickness, and if the measuring capacity of CT specimens is the function of thickness described by ASTM, an empirical or correlation-projection approach would be required to utilize fracture mechanics specimens in such programs. /Author/

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 151-163

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Filing Info

  • Accession Number: 00262256
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 22 1974 12:00AM