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RESEARCH PAPERS

The Influence of Displacement Rate on Environmentally Assisted Cracking of Precracked Ductile Steel Specimens

[+] Author and Article Information
R. A. Mayville, T. J. Warren, P. D. Hilton

Arthur D. Little, Inc., Cambridge, Mass. 02140

J. Eng. Mater. Technol 109(3), 188-193 (Jul 01, 1987) (6 pages) doi:10.1115/1.3225962 History: Received September 10, 1986; Online September 15, 2009

Abstract

Sustained load and rising displacement tests were performed on precracked specimens to investigate the environmentally assisted cracking (EAC) behavior of AISI 4340, σ0 = 1095 MPA (159 ksi), in flowing synthetic seawater. J-R resistance curves were generated in environment over four orders of magnitude in displacement rate and KIJ (from JIC ) from the slowest test was found to agree closely with the KIEAC (KISCC ) value determined from cantilever beam tests. Crack velocity data from the slowest rising displacement test and constant stroke—decreasing KI —tests fall on the same line suggesting that there is a unique ȧ-KI curve for EAC in this system. A method is suggested to determine the displacement rate needed to obtain a good estimate of KIEAC from a rising displacement test.

Copyright © 1987 by ASME
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