Effects of Defects on the In-plane Dynamic Energy Absorption of Metal Honeycombs

The in-plane dynamic energy absorption of metal honeycombs with defects consisting of missing cells are analyzed using explicit dynamic finite element method. Two types of structural defects (a single defect located in the center of the model and a double defect) are firstly introduced. Then the influence of the defects and the impact velocities on the energy absorption abilities of metal honeycombs is investigated. Researches show that single and isolated defects reduce the absorbed energy of cellular materials. The separation distance between two defects has little effect on the dynamic energy absorption, while the size of the single defect has great influence on it. These results will provide some useful guides for the safety evaluation and the dynamic energy absorption design of metal honeycombs.