Free edge effects study in laminated composites using Digital Image Correlation: effect of material and geometrical singularities
EC-Lille, LML, Boulevard Paul Langevin, Cité
2 ONERA-Lille, DADS-CRD, 5 boulevard Paul Painlevé 59045 Lille Cedex France
Composite materials are today used for various industrial applications. However, delamination on free edges, where stress gradients are strong, still remain a problem. In the aim of a better understanding of such phenomenons, Digital Image Correlation (DIC) measurements have been carried out on [(15n/-15n)2]s laminates under uniaxial tensile strain. Three different composites with different mechanical properties and microstructure have been tested as well as two samples geometries: flat and with ply drop. Experimental results show high shear strain concentrations near 15°/-15° interlaminar interfaces on free edges which depend on material mechanical properties and microstructure and increase in the vicinity of a geometrical singularity.
© Owned by the authors, published by EDP Sciences, 2010