An Interpretation of the Yoder-Griffis-Crooker Observations of Sustained-Load Cracking in Ti-6Al-4V

[+] Author and Article Information
J. M. Krafft

Ocean Materials Criteria Branch, Naval Research Laboratory, Washington, D. C.

J. Eng. Mater. Technol 96(4), 275-282 (Oct 01, 1974) (8 pages) doi:10.1115/1.3443242 History: Received March 27, 1974; Online August 17, 2010


Their recent NRL report documents a substantial degradation in load carrying capability of partially cracked specimens of annealed Ti-6 Al-4V plate in a room air environment. In this paper, the effect is analyzed as a special case of tensile ligament instability model, set up to permit integration of crack growth rate over the path to KIc . Results show that the time dependence and magnitude of the load carrying capability and of the sustained load crack growth SLC are predictable from plastic flow characteristics, including the transient stress relaxation rate, and from a slight environmental effect. A simplified diagram for engineering assessment of SLC is presented. Importance is attached to the persistence of stress relaxation, as much as to its rate, in inducing SLC. Little effect is expected from the level of fracture toughness to the extent that it is controlled by the process zone size dT .

Copyright © 1974 by ASME
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