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          NRC Library  Document Collections  NUREG-Series Publications  Publications Prepared by NRC ContractorsFracture Toughness Testing With Cracked Round Bars: Feasibility Study (NUREG/CR-6342)

On this page: Publication Information AbstractDownload complete document NUREG/CR-6342 (PDF - 4.83 MB)Publication Information **Manuscript Completed:** March 2000**Date Published:** April 2000 **Prepared by:** J.H. Giovanola, J.E. Crocker SRI International Poulter Laboratory 333 Ravenswood Avenue Menlo Park, CA 94025 Under Contract to: Oak Ridge National Laboratory Managed by Lockheed Martin Energy Research Corporation Oak Ridge, TN 37831-6158 C.J. Fairbanks, NRC Project Manager **Prepared for:** Division of Engineering Technology Office of Nuclear Regulatory Research U.S. Nuclear Regulatory Commission****Washington, DC 20555-0001 NRC Job Code L1098 Availability Notice Abstract SRI International has investigated the feasibility of measuring representative toughness values for nuclear pressure vessel materials using small cracked round bars (CRBs). We tested a weldment material [Heavy-Section Steel Irradiation (HSSI) Weld 72W with 0.23% copper] at six temperatures (-150°, -80°, -50°, 0°, 23°, and 50°C) using CRBs and compared the fracture-toughness results with data obtained for HSSI Weld 72W by Oak Ridge National Laboratory using 1T-compact tension (CT) specimens. The overall agreement between the toughness values measured with the CRBs and the 1T-CT was quite good over the entire range of temperatures and for both cleavage and ductile fracture. This agreement attests to the promise of the CRB geometry for providing valid toughness values from small specimens. Nevertheless, we observed some differences, mainly for cleavage toughness values below 0° C. We attribute the differences to (1) possible inaccuracies in the estimation formulas for the J-integral, (2) differences in constraint, and (3) statistical size effects. We recommend that work be continued to validate the CRB test procedure and to adapt it to specimens that can be fabricated from halves of broken Charpy specimens. 
      
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