Numerical Investigation on Honeycomb Foam Filling and Honeycomb Density Increasing in Ballistic Impact Behavior

In this paper, a suitable numerical model is developed to simulate projectile ballistic impact on both empty aluminum honeycomb panels and polyurethane foam filled honeycomb panels. To this end, high strain rate dependency is used in honeycomb material model and a VUMAT subroutine including elastic, crushable plastic, and fracture model is developed as foam material model. These models can predict the ballistic limit velocities of both kinds of panels with good accuracy when the results are compared with experimental data available in literature. To further compare foam filled honeycomb panels with empty honeycomb ones, the effects of increasing cell wall thickness and decreasing cell size in empty honeycomb panels are separately investigated and the ballistic limit velocities are compared with those of foam filled honeycomb panels. The results show that to increase the ballistic limit velocity, honeycomb foam filling is still superior to empty honeycomb panels with the same density even when the cell wall thickness of empty honeycomb panels is increased or the honeycomb cell size is decreased.

کلیدواژه ها:

Ballistic impact ، foam-filled honeycomb ، honeycomb density ، finite element modeling