Investigation of Adhesive Debonding in Paper Honeycomb Sandwich Panel under Blast Load

Blast mitigation of structures have become a focus of many research works due to the rising threat imposed by explosive based terrorism. Sacrificial sandwich panels are one of such blast mitigation technique, which has proven to be effective in reducing the blast-induced damage on structures. Researchers are studying new materials like honeycomb to mitigate blast load as these materials have high strength to weight ratio, high stiffness and lightweight. The failures in sandwich structures subjected to blast load are core crushing, face-sheet bending and delamination of face-sheet from core. In present investigation, authors studied delamination behaviour of sandwich panel with paper honeycomb core using ABAQUS/Explicit®. The face-sheet and back-sheet of the sandwich panels considered here are made of stainless steel and core of paper honeycomb. The adhesive layer of Araldite(R) 2015 is modelled in ABAQUS/Explicit® using cohesive zone model (CZM). The authors studied effect of variation of thickness of adhesive layer. The investigation is compared based on internal energy and central point displacement time histories of back-sheet.