Finite Element Modelling for Crash Response of a Square Tube

Ibrahim Abdullahi Rafukka

Abstract


In this work the crash characteristics of square tubes have been studied using finite element (FE) method. The effect of material properties, thickness and trigger on energy absorption capability of square tube has been investigated. Also, effect of impact angle on the crash response of the tube has been studied.  Aluminium was found to absorb energy more than steel under axial dynamic loading. Increasing thickness and introducing a trigger enhanced the energy absorption of the tube. Tubes with 1.5 mm thickness gives lowest peak load of 33.2 kN and highest SEA of 20.4 kJ/kg. Introducing trigger at 5 mm from impact end of the tube decreases initial peak load by 23%.  5o impact angle provides high CFE and SEA values of 54.8% and 15.2 kJ/kg respectively. Specific energy absorption (SEA) and crush force efficiency (CFE) decrease as the impact angle increases. The findings of this study are useful in designing high energy absorption vehicle crash box.


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