Optimization of the unnotched Iosipescu test on composites for identification from full-field measurements

F. Pierron*, G. Vert, R. Burguete, S. Avril, R. Rotinat, M. R. Wisnom

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

2 Citations (Scopus)

Abstract

The paper presents the use of an optimization routine in order to find the best combination 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 aiming at balancing out the different coefficients of the three main orthotropic stiffnesses so that the same confidence level can be reached on these three stiffnesses. Then, experimental validation was performed using an ESPI system. Full-fields were measured and stiffnesses identified and compared to the usual 0 degrees, 30 mm configuration. The outcome of the optimization 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.

Original languageEnglish
Title of host publicationModern Practice in Stress and Vibration Analysis VI, Proceedings
EditorsPS Keogh
Place of PublicationSTAFA-ZURICH
PublisherTrans Tech Publications Inc
Pages125-133
Number of pages9
ISBN (Print)0-87849-418-9
Publication statusPublished - 2006
Event6th International Conference on Modern Practice in Stress and Vibration Analysis - Bath, United Kingdom
Duration: 5 Sep 20067 Sep 2006

Publication series

NameAPPLIED MECHANICS AND MATERIALS
PublisherTRANS TECH PUBLICATIONS LTD
Volume5-6
ISSN (Print)1660-9336

Conference

Conference6th International Conference on Modern Practice in Stress and Vibration Analysis
Country/TerritoryUnited Kingdom
Period5/09/067/09/06

Keywords

  • inverse method
  • speckle interferometry
  • identification
  • heterogeneous test
  • SPECIAL VIRTUAL FIELDS
  • T-SHAPED SPECIMEN
  • MATERIAL PARAMETERS
  • ANISOTROPIC PLATES
  • BENDING RIGIDITIES
  • SIMULATIONS

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