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TECHNICAL PAPERS

Fatigue Crack Growth Rate Characteristics of Laser Shock Peened Ti-6Al-4V

[+] Author and Article Information
John J. Ruschau

University of Dayton Research Institute, 300 College Park, Dayton, OH 45469

Reji John, Theodore Nicholas

AFRL/MLLN, WPAFB, OH

Steven R. Thompson

AFRL/MLSC, WPAFB, OH

J. Eng. Mater. Technol 121(3), 321-329 (Jul 01, 1999) (9 pages) doi:10.1115/1.2812381 History: Received June 08, 1998; Revised October 21, 1998; Online November 27, 2007

Abstract

The fatigue crack growth rate (FCGR) characteristics of Laser Shock Peened (LSP) titanium 6Al-4V were examined and compared to those of unprocessed material. The FCGR resistance of LSP processed material tested at low stress ratios (R) is shown to be significantly greater than for unprocessed, baseline material. The increased damage tolerance can be attributed to the large residual compressive stresses generated by the LSP process. Differences in the growth rate behavior due to LSP can be accounted for by using the closure corrected effective stress intensity range, ΔKeff , which takes into account only the portion of loading above the crack opening load. The rationale of using ΔKeff is also demonstrated through fractographic investigations.

Copyright © 1999 by The American Society of Mechanical Engineers
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