Numerical Analysis of Crack Propagation in Cyclic-Loaded Structures

[+] Author and Article Information
R. G. Forman, V. E. Kearney, R. M. Engle

Air Force Flight Dynamics Laboratory (FDTR), Wright-Patterson Air Force Base, Ohio

J. Basic Eng 89(3), 459-463 (Sep 01, 1967) (5 pages) doi:10.1115/1.3609637 History: Received August 04, 1966; Online November 03, 2011


An improved theory is proposed for the crack-growth analysis of cyclic-loaded structures. The theory assumes that the crack tip stress-intensity-factor range, ΔK, is the controlling variable for analyzing crack-extension rates. The new theory, however, takes into account the load ratio, R, and the instability when the stress-intensity factor approaches the fracture toughness of the material, Kc . Excellent correlation is found between the theory and extensive experimental data. A computer program has been developed using the new theory to analyze the crack propagation and time to failure for cyclic-loaded structures.

Copyright © 1967 by ASME
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