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Interlaminar shear strain measurement on angle-ply laminate free edge using digital image correlation
Authors:Pauline Lecomte-Grosbras  Bernard Paluch  Mathias Brieu  Géry De Saxcé  Laurent Sabatier
Affiliation:1. ONERA/DADS, 5 boulevard Paul Painlevé, 59045 Lille, France;2. Ecole Centrale de Lille, Laboratoire de Mécanique de Lille, Cité scientifique, 59655 Villeneuve d’Ascq, France;3. Université des Sciences et Technologies de Lille, Laboratoire de Mécanique de Lille, Cité scientifique, 59655 Villeneuve d’Ascq, France;4. CNRS, Laboratoire de Mécanique de Lille, Cité scientifique, 59655 Villeneuve d’Ascq, France;1. Département de gynécologie-obstétrique, centre hospitalier Paul-Ardier, 63340 Issoire, France;2. Laboratoire d’analyse SIPATH, La Pardieu, 63000 Clermont-Ferrand, France;3. Département de gynécologie-obstétrique, hôpital Estaing, CHU de Clermont-Ferrand, 63000 Clermont-Ferrand, France;4. Département de gynécologie-obstétrique, hôpital Nord, CHU de Saint-Étienne, 2, avenue Albert-Raimond, 42000 Saint-Étienne, France;1. School of Engineering and Materials Science and Materials Research Institute, Queen Mary University of London, Mile End Road, London, E1 4NS, UK;2. Nanoforce Technology Ltd, Joseph Priestley Building, Queen Mary University of London, Mile End Road, London, E1 4NS, UK;3. NGF Europe Limited, Lea Green, St Helens, WA9 4PR, UK;1. Wind R&D Center, Siemens Energy Inc., Boulder, Colorado 80302, USA;2. Department of Engineering Sciences and Mathematics, Luleå University of Technology, SE 971 87 Luleå, Sweden;3. Department of Aerospace Engineering, Texas A&M University, College Station, Texas 77843-3141, USA;1. AMADE, Polytechnic School, University of Girona, Av. Universitat de Girona, 4, 17003 Girona, Spain;2. Chomarat, 39 Avenue de Chabannes, 07160 Le Cheylard, France
Abstract:Because only coarse polishing is required in order for Digital Image Correlation (DIC) to be used, such a technique has been used to study interlaminar shear strain on the free edges of carbon/epoxy laminates. Pure UD and quasi UD have been considered. The measurement uncertainties are small when compared to measured fields. The correlation parameters of DIC have been optimized to highlight the strain gradients. DIC results for pure-UD samples show high interlaminar strain gradients with a non-linear behaviour and local damage close to inter-ply interfaces. Measurements of quasi-UD samples highlight the microstructure influence on the spatial repartition of free edge strain gradients.
Keywords:
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