Strain Rate Effects on Fracture Toughness of Ship Plate Steels

[+] Author and Article Information
L. N. Pussegoda, L. Malik

Materials Technology Centre, Fleet Technology Ltd., 311 Legget Drive, Kanata, Ontario, Canada K2K 1Z8

R. Bouchard, W. R. Tyson

Metals Technology Laboratories, CANMET, 568 Booth Street, Ottawa, Ontario, Canada K1A 0G1

J. Offshore Mech. Arct. Eng 118(2), 127-134 (May 01, 1996) (8 pages) doi:10.1115/1.2828821 History: Received July 10, 1995; Revised December 05, 1995; Online December 17, 2007


Full thickness fracture toughness of conventional ship plate grades, including modern high-strength steels, was determined at loading rates representing quasi-static, intermediate, and impact conditions. For testing at impact strain rates (ε̇ = 5 s−1 ), customized equipment was designed and developed for a drop tower. It was shown from the CTOD transition temperature curves that the transition temperature increase from quasi-static to intermediate rate (a three-order rate increase) is much greater than the increase from intermediate to impact (a two-order rate increase). Comparison of the dynamic CTOD, CVN, and NDTT indicated that the correlation between the CVN and 0.1-mm dynamic CTOD transition temperature does not hold for the TMCP steels, for which the CVN transition temperature is much lower. By contrast, the results display a very good correlation between the NDTT and 0.1-mm dynamic CTOD transition temperature for all of the steels tested in this program.

Copyright © 1996 by The American Society of Mechanical Engineers
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