چکیده

In this paper, a new form of energy absorbing structures has been introduced which energy absorbing is occurred
during a combined process. The structure consists of a thinwalled aluminum matrix and a thinwalled steel
punch. Energy is absorbed as the matrix gets expanded followed by simultaneous matrix and punch folding. In
order to demonstrate the eﬀectiveness of absorbent introduced, many samples of each type were fabricated and
tested. In one case, it was found that, the new structure tends to absorb up to 32% more energy than sum of the
energy absorbed by its individual parts. Also, the energy absorption properties and the parametric study were
simulated using ﬁnite element code LSDyna. The results showed that among diﬀerent section geometries,
structures with rectangular section have the lowest energy absorption and the highest crush force eﬃciency; by
increasing the number of sides of the cross section the absorbed energy increased and crush force eﬃciency is
decreased. In addition, increasing the thickness of the punch leads to increased energy absorption. Also, it was
found that, selecting an appropriate thickness for the punch, one can predict overall shape of loaddisplacement
curve and maximum force location for the combined structure.
