SEDL / STP / STP1060-EB / STP23431S

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

Dally, JW
Professor, University of Maryland at College Park, College Park, MD

Sciammarella, CA
Professor, Illinois Institute of Technology, Chicago, IL

Shareef, I
Assistant professor, Bradley University, Peoria, IL

Pages: 12    Published: Jan 1990

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Abstract

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.