Experimental and Simulation Study of Honeycomb Core under Dynamic Loading

Abstract

The objective of this project is to get the energy absorption of aluminium honeycomb core through experimental work and simulation analysis. The force-displacement behavior and energy absorb are studied for two different cell sizes of honeycomb core, which are 0.0127 m and 0.01905 m, respectively. The out-of-plane dynamic compression tests are conducted for the specimens by using INSTRON CEAST 9340 drop tower machine with an impact mass of 25 kg at 800 mm height and generate an impact velocity of 3.96 m/s. The linear elastic regime, flat plateau force regime and densification regime are observed in the force-displacement behavior in the crushing of aluminium honeycomb core. In finite element simulation, the model of honeycomb structures with 0.0127 m cell size is created in ABAQUS 6.12 in explicit environment. Several parameters such as mesh sizes, time intervals and plasticity models with Isotropic hardening and Johnson-Cook hardening are investigated in the simulation and validated with the experimental results. Isotropic plasticity model with 1 mm mesh size and 500-time interval is the optimum parameters in modelling aluminium honeycomb core with 0.0127 m cell size where the buckling mode of the specimen is similar with the experimental work.