Modélisation en Flambement et Etude du Comportement des Structures Sandwichs à âme en nid d’abeilles

Abstract

Compared to other core materials, honeycomb materials provide impressive mechanical performance for sandwich panels, but with less weight added to the structures. The aim of the present study is to understand the crushing mechanism, honeycomb test specimens made of Nomex and aluminum alloy were tested. The critical buckling loads for various core densities and materials of honeycomb composite panels are experimentally and numerically investigated in this study. The effect of the honeycomb core density on the critical buckling load is investigated. The different specimens exhibited similar load/displacement curves and the differences observed were only due to the behavior of the different materials. The critical buckling load of paper core panels is determined to be higher than that of aluminum core panels. It is seen that the buckling strength of the specimens increases by the increase of core density. As the critical buckling load exceeds a certain limit, regional core cell buckling and core crushing are seen in aluminum core panels. In paper core panels, regional cracks are seen, in addition to these failures. The study also calculates the numeric buckling loads of the panels using the ABAQUS finite element analysis program. The achieved experimental and numerical results are compared with each other and the results are provided in curves and tables.