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RESEARCH PAPERS

J-Estimation Procedure Based on Moire Interferometry Data

[+] Author and Article Information
B. S. J. Kang

Department of Mechanical and Aerospace Engineering, West Virginia University, Morgantown, W.Va. 26506

A. S. Kobayashi

Department of Mechanical Engineering, University of Washington, Seattle, Wash. 98195

J. Pressure Vessel Technol 110(3), 291-300 (Aug 01, 1988) (10 pages) doi:10.1115/1.3265602 History: Received April 22, 1988; Online November 05, 2009

Abstract

The accuracy of the approximate J -estimation procedure evaluated along rectangular contours in the elastic and the HRR crack tip fields was assessed. The path independency of the approximate J ’s in the presence of LEFM and elastic-plastic stress fields was demonstrated experimentally in 7075-T6, 2024-0 and 5052–H32 SEN specimens with small stable crack growth of 1 to 2 mm. HRR field does not exist in a ductile material with relatively large strain-hardening exponent, i.e., N = 15. The approximate J and the COD resistance curves for 2024-0 and 5052-H32 specimens for small crack extension was established. These curves showed little sensitivity to the notch tip acuity due to large plastic yielding.

Copyright © 1988 by ASME
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