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RESEARCH PAPERS

Full-Thickness Crack Arrest Fracture Toughness of 9-Percent Ni (ASTM 553, Type 1) Steels

[+] Author and Article Information
E. J. Ripling, P. B. Crosley

Materials Research Laboratory, Inc., Glenwood, IL 60425

J. Pressure Vessel Technol 113(3), 375-379 (Aug 01, 1991) (5 pages) doi:10.1115/1.2928769 History: Received August 20, 1990; Revised March 22, 1991; Online June 17, 2008

Abstract

Measurements were made of the full-thickness crack arrest fracture toughness (FTCAT) of three 9-percent Ni steels having the range of thicknesses and Charpy V-notch toughnesses of plates now in LNG storage tank service. Unlike the plates used in large pressure vessels, these thinner plates do not crack under a condition of plane strain, so that test method ASTM E1221 “Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, Kla , of Ferritic Steels,” was modified for these tests. The toughness of all three steels was measured at liquid nitrogen temperature (−196C), but two of the three were too tough to be measured at LNG storage temperature (−162C). Even the least tough plate had a high enough toughness to arrest long cracks in LNG storage service.

Copyright © 1991 by The American Society of Mechanical Engineers
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