Paper number 882

NEW METHODOLOGY TO STUDY THE BEHAVIOUR OF DELAMINATED COMPOSITE STRUCTURES

J.C. Walrick¹, D. Coutellier², P. Geoffroy¹, D. Dormegnie¹

1O.N.E.R.A.-I.M.F.L., 5 Boulevard Paul-Painlevé, 59045 Lille Cedex.
2L.A.M.I.H-G.M, UMR CNRS 8530, Université de Valenciennes et du Hainaut Cambrésis, BP311 59304 Valenciennes Cedex.

Summary

Laminated composite structures are used in many fields, for example ground transportation. To predict their mechanical behaviour under loading, it is necessary to have a suitable understanding of all the damaging processes such as delamination propagation. This study intends to detect and follow the delamination growth in a single multi-layer element for a modelling structure in finite elements code. Secondly, we are interested by progressive restitution of delamination effects in laminated modelling structure. The approach is applied with [902/02]s plates in three-point bending. Detection of discontinuous delamination growth front in transverse strips shape is validated by experimental tests. A similar validation is made for delamination effects restitution by comparison with energetic strain levels reached by loaded structure.

Keywords

delamination, fracture mechanics, behaviour law, modelling, finite elements, Tsai-Hill criterion, energy density criterion, interface.