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RESEARCH PAPERS

Effects of Crack Depth, Specimen Size, and Out-of-Plane Stress on the Fracture Toughness of Reactor Vessel Steels

[+] Author and Article Information
Y.-J. Chao

Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208

P.-S. Lam

Westinghouse Savannah River Technology Center, Aiken, SC 29802

J. Pressure Vessel Technol 118(4), 415-423 (Nov 01, 1996) (9 pages) doi:10.1115/1.2842207 History: Received March 09, 1995; Revised January 05, 1996; Online February 11, 2008

Abstract

Cleavage fracture toughness values for A533-B reactor pressure vessel (RPV) steel at -40°C obtained from test programs at Oak Ridge National Laboratory (ORNL) and University of Kansas (KU) are interpreted using the J-A2 analytical model. The KU test data are from smaller SENB specimens with a/w = 0.1 and 0.5. The ORNL test data are from 1) larger SENB specimens with a/w = 0.1 and 0.5, and 2) a six-point-bend cruciform specimen under either uniaxial or bi-axial loads. The analytical model is based on the critical stress criterion and takes into consideration the constraint effect using the second parameter A2 in addition to the generally accepted loading parameter J . It is demonstrated that the effects of crack depth (shallow versus deep), specimen size (small versus large), and loading type (uniaxial versus biaxial) on the fracture toughness from the test programs can be interpreted and predicted.

Copyright © 1996 by The American Society of Mechanical Engineers
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