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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

Mello, M. and Hong, S. and Rosakis, A. J. (2009) Extension of the Coherent Gradient Sensor (CGS) to the combined measurement of in-plane and out-of-plane displacement field gradients. Experimental Mechanics, 49 (2). pp. 277-289. ISSN 0014-4851. http://resolver.caltech.edu/CaltechAUTHORS:20090618-094221376

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1007/s11340-008-9147-zDOIArticle
http://www.springerlink.com/content/73076l6t378l50v2/PublisherArticle
http://rdcu.be/rs4mPublisherFree ReadCube access
Additional Information:© 2009 Springer. Received: 20 November 2007 Accepted: 7 April 2008 Published online: 7 June 2008. 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.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG52-06NA 26209
Department of Energy (DOE)B523297
Office of Naval Research (ONR)N00014-06-1-0730
Subject Keywords:Coherent Gradient Sensor (CGS); Diffracted wave front shearing; In-plane displacement field gradients; Out-of-plane displacement field gradients; Moire; Fine pitch grating; Ronchi grating; Phase shifting; Phase map; Crack tip deformation fields; Mode I; Mode II; Mixed mode
Record Number:CaltechAUTHORS:20090618-094221376
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20090618-094221376
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14411
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Aug 2009 23:16
Last Modified:19 Apr 2017 23:45

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