A combined experiment with simulation approach to calibrated 3D strain measurement using shearography

Dênis T. Goto; Roger M. Groves

doi:10.1117/12.870572

13 September 2010 A combined experiment with simulation approach to calibrated 3D strain measurement using shearography

Dênis T. Goto, Roger M. Groves

Proceedings Volume 7387, Speckle 2010: Optical Metrology; 73871J (2010) https://doi.org/10.1117/12.870572
Event: Speckle 2010, 2010, Florianapolis, Brazil

Abstract

This paper is concerned with the development of a calibrated 3D shearography strain measurement instrument, calibrated iteratively, using a combined mechanical-optical model and specially designed test objects. The test objects are a cylinder loaded by internal pressure and a flat plate under axial load. Finite element models of the samples, combined with optical models of the shearography system, allow phase maps to be simulated for subsequent comparison with experimental phase maps from the shearography instrument. The algorithm to extract the strain maps from the phase maps includes an error compensation for in-plane strains on curved surfaces, measurement channel redundancy, variations in the shear magnitude due to object shape and the optical characteristics of the imaging system. The improvement introduced by the error compensation techniques is verified by the opto-mechanical simulation and its effect is demonstrated experimentally on maps of displacement gradient.

Citation Download Citation

Dênis T. Goto and Roger M. Groves "A combined experiment with simulation approach to calibrated 3D strain measurement using shearography", Proc. SPIE 7387, Speckle 2010: Optical Metrology, 73871J (13 September 2010); https://doi.org/10.1117/12.870572

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available