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In this study, impact behavior of triggered and non-triggered tubes with and without auxetic filler are examined by using numerical methods. Material properties of tubes made of aluminum alloy and auxetic lattices utilizing ABSplus plastics are determined by using tensile tests. Finite element analyses are performed by using LS-DYNA software at 5 m/s impact velocity. Two different trigger shape are suggested and compared each other and discussed the advantages and disadvantages over nontriggered tubes. For these loading conditions, trigger mechanism provides lower peak forces and higher crash force efficiency (CFE), but lower specific energy absorption (SEA). Also, the effects of using auxetic fillers in these triggered tubes are investigated in terms crashworthiness characteristics.

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