SYMPOSIA PAPER Published: 01 January 1990

Extraction of Stress-Intensity Factor from In-Plane Displacements Measured by Holographic Interferometry


Utilizing the well-known Westergaard approach in conjunction with Goursat-Kolosov series stress functions, suitable series solutions are developed for stresses and displacements around the crack tip. In-plane displacement data from the entire field near the crack tip are obtained by holographic interferometry. Measurement errors in the experimental data are minimized by the least-squares method. Series solution of displacements together with experimental data is used to establish the loss of inverse square-root singularity at the free surface-crack border intersection. Experimental results are compared with the analytical results from recent studies, and a good correlation is found between analytical and experimental values.

Author Information

Dally, JW
University of Maryland at College Park, College Park, MD
Sciammarella, CA
Illinois Institute of Technology, Chicago, IL
Shareef, I
Bradley University, Peoria, IL
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Developed by Committee: E08
Pages: 130–141
DOI: 10.1520/STP23431S
ISBN-EB: 978-0-8031-5121-5
ISBN-13: 978-0-8031-1284-1