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TECHNICAL PAPERS

Effect of Wrought Product Thickness and Stress Ratio on Fatigue Crack Growth Behavior of a Quaternary Aluminium-Lithium Alloy

[+] Author and Article Information
Vikas Kumar Saxena

Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad-500 058, India

V. M. Radhakrishnan

Department of Metallurgical Engineering, Indian Institute of Technology, Madras-600 036, India

J. Eng. Mater. Technol 121(3), 393-398 (Jul 01, 1999) (6 pages) doi:10.1115/1.2812392 History: Received January 27, 1998; Revised June 23, 1998; Online November 27, 2007

Abstract

Effect of thickness on fatigue crack growth (FCG) behavior has been investigated at varying stress ratio in a quaternary Al-Li alloy. The thickness has been observed to influence FCG behavior in two opposite ways, depending on stress ratio. The crack closure concept has been invoked to rationalize the observed behavior. The roughness-induced crack closure is the main governing mechanism in the alloy under investigation. Factors such as fracture surface asperity size and severity of plane strain condition have been argued to affect the extent of crack closure, and consequently, fatigue crack growth behavior.

Copyright © 1999 by The American Society of Mechanical Engineers
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