Experimental and numerical analysis of the shear nonlinear behaviour of Nomex honeycomb core: Application to insert sizing

Juan de Dios Rodriguez-Ramirez (1) , Bruno Castanié (1) , Christophe Bouvet (1)

1 ICA - Institut Clément Ader

This work is a contribution to the understanding of the nonlinear shear behaviour caused by cell postbuckling in Nomex honeycomb cores. First, an experimental benchmark study was made of different designs for the shear testing of honeycomb cores. Then, several test specimens were fabricated and tested, a 3D DIC system being used to measure and record the displacements. An Artificial Neural Network (ANN) was also used to identify the onset of bucking and collapse of the cells. The influence of the overall boundary conditions of shear tests on the buckling of the cells is presented both experimentally and numerically. The reversibility and test procedure results suggest that it may be possible to allow the shear strength to be increased by up to 35% under certain conditions.

Mots clés: Buckling; Finite elements; Honeycomb; Shear testing; Inserts

Domaines: Mécanique des matériaux [physics.class-ph]

Juan de Dios Rodriguez-Ramirez, Bruno Castanié, Christophe Bouvet. Experimental and numerical analysis of the shear nonlinear behaviour of Nomex honeycomb core: Application to insert sizing. Composite Structures, 2018, vol. 193, pp. 121-139. ⟨10.1016/j.compstruct.2018.03.076⟩. ⟨hal-01793199⟩