On the use of simulated experiments in designing tests for material characterization from full-field measurements
On the use of simulated experiments in designing tests for material characterization from full-field measurements
The present paper deals with the use of simulated experiments to improve the design of an actual mechanical test. The analysis focused on the identification of the orthotropic properties of composites using the unnotched Iosipescu test and a full-field optical technique, the grid method. The experimental test was reproduced numerically by finite element analysis and the recording of deformed grey level images by a CCD camera was simulated trying to take into account the most significant parameters that can play a role during an actual test, e.g. the noise, the failure of the specimen, the size of the grid printed on the surface, etc. The grid method then was applied to the generated synthetic images in order to extract the displacement and strain fields and the Virtual Fields Method was finally used to identify the material properties and a cost function was devised to evaluate the error in the identification. The developed procedure was used to study different features of the test such as the aspect ratio and the fibre orientation of the specimen, the use of smoothing functions in the strain reconstruction from noisy data, the influence of missing data on the identification. Four different composite materials were considered and, for each of them, a set of optimized design variables was found by minimization of the cost function.
420-435
Rossi, Marco
1fea52ac-027b-4309-82e5-dd9cba8249e6
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
February 2012
Rossi, Marco
1fea52ac-027b-4309-82e5-dd9cba8249e6
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Rossi, Marco and Pierron, Fabrice
(2012)
On the use of simulated experiments in designing tests for material characterization from full-field measurements.
International Journal of Solids and Structures, 49 (3-4), .
(doi:10.1016/j.ijsolstr.2011.09.025).
Abstract
The present paper deals with the use of simulated experiments to improve the design of an actual mechanical test. The analysis focused on the identification of the orthotropic properties of composites using the unnotched Iosipescu test and a full-field optical technique, the grid method. The experimental test was reproduced numerically by finite element analysis and the recording of deformed grey level images by a CCD camera was simulated trying to take into account the most significant parameters that can play a role during an actual test, e.g. the noise, the failure of the specimen, the size of the grid printed on the surface, etc. The grid method then was applied to the generated synthetic images in order to extract the displacement and strain fields and the Virtual Fields Method was finally used to identify the material properties and a cost function was devised to evaluate the error in the identification. The developed procedure was used to study different features of the test such as the aspect ratio and the fibre orientation of the specimen, the use of smoothing functions in the strain reconstruction from noisy data, the influence of missing data on the identification. Four different composite materials were considered and, for each of them, a set of optimized design variables was found by minimization of the cost function.
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- Author's Original
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e-pub ahead of print date: 19 November 2011
Published date: February 2012
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 209665
URI: http://eprints.soton.ac.uk/id/eprint/209665
ISSN: 0020-7683
PURE UUID: fa043d10-cd14-4278-88e4-67ef3f0001d5
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Date deposited: 01 Feb 2012 15:14
Last modified: 15 Mar 2024 03:35
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Author:
Marco Rossi
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