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RESEARCH PAPERS

Cleavage and Ductile Thermal Shock Fractures of Corner-Cracked Nozzles

[+] Author and Article Information
G. Yagawa

Department of Nuclear Engineering, University of Tokyo, Bunkyoku, Tokyo, Japan

K. Ishihara

Iron and Steel Research Laboratories, Sumitomo Metal Industries, Amagasaki, Japan

J. Pressure Vessel Technol 111(3), 241-246 (Aug 01, 1989) (6 pages) doi:10.1115/1.3265670 History: Received June 06, 1985; Revised February 20, 1989; Online November 05, 2009

Abstract

In order to study the structural integrity of the reactor pressure vessel under pressurized thermal shock, both the cleavage and the ductile thermal shock fracture experiments using initially corner-cracked nozzle specimens made of Type A508 class 3 pressure vessel steel were performed. In both experiments, unstable fractures were realized, although the test conditions were very conservative compared to those of real plants. Finally, the three-dimensional and time-dependent fracture parameter obtained with the finite element method was successfully employed to discuss the fracture phenomenon.

Copyright © 1989 by ASME
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