Compression behavior and energy-absorption characteristic of aluminum honeycomb material with polyurethane filler

Static compression experiments were conducted on hollow aluminum honeycomb (hexagon aperture), polyurethane, and aluminum honeycomb filled with polyurethane. The mechanical behavior and energy absorption characteristics of the composite were analyzed. Experimental results show that the stress-strain curve of the composite exhibits three stages:elasticity, yield and compaction. The initial stiffness and yield stress greatly increase co,npared to the hollow aluminum honeycomb. Because of the addition of the aluminum honeycomb, the deformation recovery of the polyurethane decreases by 25%. The maximum energy absorption efficiency of the composite is 1.47 times that of the pure polyurethane, and the composite materials show a better energy absorption efficiency than the pure polyurethane under a larger stress. The maximum energy absorption efficiency of the 1 mm aperture aluminum honeycomb with polyurethane filler is 1.37 times that of the 2 mm aperture aluminum honeycomb with polyurethane filler. The larger the loading rate, the greater the peak value of the energy absorption efficiency and the stress at the time of reaching the maximum energy absorption efficiency are.