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Identification of the orthotropic elastic stiffnesses of composites with the virtual fields method: sensitivity study and experimental validation

Identification of the orthotropic elastic stiffnesses of composites with the virtual fields method: sensitivity study and experimental validation
Identification of the orthotropic elastic stiffnesses of composites with the virtual fields method: sensitivity study and experimental validation
This paper presents the use of a sensitivity study to find the best combinations of free length and fibre angle in an unnotched Iosipescu test processed with the virtual fields method. The sensitivity to noise coefficients arising from the special virtual fields procedure are used to build up a cost function. This function is aimed at balancing out the coefficients of the different orthotropic stiffnesses so that the same confidence level can be reached on all these parameters. Then, experimental validation was performed using a speckled interferometry (ESPI) system. Full-field strains were measured and stiffnesses identified and compared between the usual 0°, 30 mm configuration and an improved 25°, 40 mm configuration. The outcome of the optimisation was confirmed by testing the same specimen several times and comparing scatter between the two configurations. This is a first promising result on the way to the design of a new test for orthotropic stiffness identification on a single specimen from full-field measurements.
heterogeneous test, identification, inverse method, speckle interferometry
1475-1305
250-259
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Vert, G.
fe38963f-b349-43e8-9438-5d2ef0877701
Burguete, R.
a075aa86-a484-4023-afc5-6c317b0b7a2d
Avril, S.
6c8490e9-2ae9-41c3-9bf8-bfbb3836c097
Rotinat, R.
8af55bde-4838-49f6-b4ff-197e3e5afe0a
Wisnom, M.R.
687416aa-8839-400c-afa3-9fd083f20845
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Vert, G.
fe38963f-b349-43e8-9438-5d2ef0877701
Burguete, R.
a075aa86-a484-4023-afc5-6c317b0b7a2d
Avril, S.
6c8490e9-2ae9-41c3-9bf8-bfbb3836c097
Rotinat, R.
8af55bde-4838-49f6-b4ff-197e3e5afe0a
Wisnom, M.R.
687416aa-8839-400c-afa3-9fd083f20845

Pierron, F., Vert, G., Burguete, R., Avril, S., Rotinat, R. and Wisnom, M.R. (2007) Identification of the orthotropic elastic stiffnesses of composites with the virtual fields method: sensitivity study and experimental validation. Strain, 43 (3), 250-259. (doi:10.1111/j.1475-1305.2007.00346.x).

Record type: Article

Abstract

This paper presents the use of a sensitivity study to find the best combinations of free length and fibre angle in an unnotched Iosipescu test processed with the virtual fields method. The sensitivity to noise coefficients arising from the special virtual fields procedure are used to build up a cost function. This function is aimed at balancing out the coefficients of the different orthotropic stiffnesses so that the same confidence level can be reached on all these parameters. Then, experimental validation was performed using a speckled interferometry (ESPI) system. Full-field strains were measured and stiffnesses identified and compared between the usual 0°, 30 mm configuration and an improved 25°, 40 mm configuration. The outcome of the optimisation was confirmed by testing the same specimen several times and comparing scatter between the two configurations. This is a first promising result on the way to the design of a new test for orthotropic stiffness identification on a single specimen from full-field measurements.

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More information

e-pub ahead of print date: 18 June 2007
Published date: August 2007
Keywords: heterogeneous test, identification, inverse method, speckle interferometry
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 210633
URI: http://eprints.soton.ac.uk/id/eprint/210633
ISSN: 1475-1305
PURE UUID: c74fbbc3-5999-4d8b-991d-12c030378c1f
ORCID for F. Pierron: ORCID iD orcid.org/0000-0003-2813-4994

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Date deposited: 09 Mar 2012 11:28
Last modified: 15 Mar 2024 03:35

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Contributors

Author: F. Pierron ORCID iD
Author: G. Vert
Author: R. Burguete
Author: S. Avril
Author: R. Rotinat
Author: M.R. Wisnom

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