Paper number 1284

DELAMINATION IN MODE I AND II OF CARBON FIBRE COMPOSITE MATERIALS : FIBRE ORIENTATION INFLUENCE

F. LACHAUD¹,² R. PIQUET² and L. MICHEL¹

2LGMT, IUT de Génie Mécanique,
50, Chemin des Maraîchers, 31077 TOULOUSE Cedex 4, France
1ENSICA, Département Génie mécanique,
1, Place Emile Blouin 31056 TOULOUSE Cedex, France

Summary

Experimental and numerical studies of delamination in mode I and II have been carried out on thermoset and thermoplastic carbon fibre composite materials in order to determine critical energy release rates. The influence of fibre orientation around the delamination front have been studied. Results show a great influence of fibre orientation on the delamination propagation. Numerical studies are presented in order to compute energy release rates. Results are compared to experimentation. Two applications of fracture mechanic using energy release rate values are presented. Then numerical analyses are realised. For these applications a mixed mode criterion is used. The first application concerning delamination caused by local buckling. The second one deals with delamination caused by machining and specially drilling.

Keywords

delamination, fracture mechanics, finite element methods, DCB, ENF, local buckling, damage, non-linearity, drilling, machining.