Crack Closure and Propagation Studies to Determine the Effects of Simple Load Interaction

[+] Author and Article Information
Satish Chand

Reader of Mechanical Engineering Department, M.N.R. Engineering College, Allahabad—211004, India

J. Eng. Mater. Technol 114(3), 229-236 (Jul 01, 1992) (8 pages) doi:10.1115/1.2904166 History: Received January 12, 1990; Revised July 03, 1991; Online April 29, 2008


Crack closure and fatigue crack growth experiments were performed on centrally notched specimens of 6063-T6 Al-alloy under single overload and block loading conditions. Using crack closure data, values of effective stress range ratio (U) were found. Assuming that the crack closure phenomenon is responsible for transient behavior of fatigue crack growth rate (FCGR), the FCGR behavior during load interaction was predicted using a constant amplitude crack propagation description in conjunction with the experimentally measured U-values. On comparing predicted FCGR with those found experimentally, it was observed that the predicted FCGR always agrees with the trend of experimental FCGR behavior and provides either exact or conservative estimates of the FCGR.

Copyright © 1992 by The American Society of Mechanical Engineers
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