H Alikhani - School of Mechanical Engineering, Iran University of Science & Technology (IUST), Narmak, Tehran ۱۶۸۴۶-۱۳۱۱۴, Iran
S Derakhshan - School of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran
H Khoramishad - School of Mechanical Engineering, Iran University of Science & Technology (IUST), Narmak, Tehran ۱۶۸۴۶-۱۳۱۱۴, Iran

In this study, the effects of impact angle and impactor geometry were investigated on the impact behavior of aluminum honeycombs experimentally and numerically. The high-velocity impact tests were carried out using a gas-gun test machine with flat, spherical and conical-head impactors and impact angles of ۰°, ۱۵° and ۳۰° at different incident velocities ranging from ۵۵.۸ to ۱۵۰.۵ m/s. The numerical models were developed in LS-Dyna finite element code and well validated against the experimental results. The results showed that the impact behavior of honeycombs is considerably dependent on the impactor head geometry and the impact angle. The honeycomb panel impacted by the conical projectile experienced the highest absorbed energy and ballistic limit velocity. Moreover, it was found out that increasing the impact angle increased the absorbed energy and ballistic limit velocity of honeycombs. Furthermore, different impactor head geometries resulted in different failure mechanisms in the course of impact loading.

Aluminum honeycomb, High-velocity impact, energy absorption, Impactor geometry, Impact angle