Crack-Toughness Testing of Strain-Rate Sensitive Materials

[+] Author and Article Information
G. R. Irwin

Mechanics Division, Code 6200, U. S. Naval Research Laboratory, Washington, D. C.

J. Eng. Power 86(4), 444-450 (Oct 01, 1964) (7 pages) doi:10.1115/1.3677632 History: Received August 30, 1963; Online January 10, 2012


Studies of the fracture behaviors of strain-rule sensitive materials suggest sharply notched impact-type toughness evaluations are fast enough for adiabatic conditions at the crack border and are largely controlled by a minimum level of the crack toughness. With the possible exception of very high strength steels, when a fatigue-cracked steel specimen is loaded in a time longer than 10−3 seconds, the crack border is stationary prior to instability and the KIc value is well above the minimum level. Using KIc data and estimates of the isothermal-adiabatic boundary, fracture behaviors of strain-rate sensitive metals can be outlined over a wide range of crack speeds and stress rates.

Copyright © 1964 by ASME
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