A Comparison of the Initiation With the Rapid Propagation of a Crack in a Mild Steel Plate

[+] Author and Article Information
J. Eftis

School of Engineering, George Washington University, Washington, D. C.

J. M. Krafft

Mechanics Division, U. S. Naval Research Lab., Washington, D. C.

J. Basic Eng 87(1), 257-263 (Mar 01, 1965) (7 pages) doi:10.1115/1.3650520 History: Received February 19, 1964; Online November 03, 2011


Recent indications of a direct proportionality between plane strain fracture toughness KIc and the strain hardening exponent n provide a new basis for comparing the initiation with the propagation of a crack. A mild steel from the University of Illinois wide plate studies was employed because of its extensive crack propagation data. With this, the proportionality KIc /n was established at low temperatures. The n values were then measured at service temperatures and also at extremely high strain rates, to 6000/sec, with bar impact loaders. The additional speed range delineates a series of minimum fracture toughness levels even at temperatures above the NDT or CV 15. A plot of adiabatic minima KIc(Q) as pertinent to the crack arrest temperature and isothermal KIc(T) to crack initiation permits a more quantitative interpretation of the Pellini fracture diagram.

Copyright © 1965 by ASME
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