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Extension of the Coherent Gradient Sensor (CGS) to the Combined Measurement of In-Plane and Out-of-Plane Displacement Field Gradients

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Abstract

The Coherent Gradient Sensor (CGS) is extended to the optical differentiation of specular, diffracted wave fronts leading to the combined measurement of in- and out-of-plane displacement field gradients. A derivation of the underlying optical interference principles is presented along with an analysis of the effective instrument sensitivity. In order to demonstrate the capabilities of the technique, experimental measurements of crack-tip deformation fields were conducted under various loading conditions corresponding to mode-I, mode-II, and mixed mode near-tip crack fields. The experimental procedures and results of these tests are presented as validation of the technique.

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Acknowledgements

The authors gratefully acknowledge the support of the US Department of Energy (Grant DE-FG52-06NA 26209, ASC grant B523297 (LLNL), and the Office of Naval Research through a Caltech MURI grant, N0014-06-1-0730—Dr. Y.D.S Rajapakse, Program Manager.

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Authors and Affiliations

  1. Graduate Aeronautical Laboratories (GALCIT), California Institute of Technology, Pasadena, CA, 91125, USA

    M. Mello (SEM Member) & A. J. Rosakis (SEM Member)

  2. Sandia National Laboratories, P.O. Box 0969-MS 9042, Livermore, CA, 94550, USA

    S. Hong

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  1. M. Mello
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  2. S. Hong
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  3. A. J. Rosakis
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Correspondence to M. Mello.

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Mello, M., Hong, S. & Rosakis, A.J. Extension of the Coherent Gradient Sensor (CGS) to the Combined Measurement of In-Plane and Out-of-Plane Displacement Field Gradients. Exp Mech 49, 277–289 (2009). https://doi.org/10.1007/s11340-008-9147-z

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  • DOI: https://doi.org/10.1007/s11340-008-9147-z

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