This paper presents the performance of
crashworthiness on multiple section bi-tubular thinwalled structures. The material of these models was from
aluminum alloy 6060 and the structure consists of an
outer tube and an inner tube with any one of various
shapes such as triangle, square, hexagon, and octagon.
The effect of different cross section of tube under
dynamic axial impact is studied. As a result, the energy
absorption capacity of various inner tubes was compared
and it shows that octagonal inner tube has the better
performance of crashworthiness than other inner tubes.
Therefore, to get the optimal parameters, the Non
Surrogate Genetic Algorithm II (NSGA II) focuses on
achieving the maximum total energy absorption (TEA)
and the minimum peak crushing force (PCF). During the
process of multi objective optimization design, it was
found to be accurate enough for engineering design of
structures with inner tube by octagon.
Keywords : Crashworthiness; Double Tube; Dynamic Axial Impact.