• Witono Hardi Universitas Khairun
Keywords: energy absorbed, thin aluminum tube, aluminum alloy, finite elemen method


The number of deaths from car accidents is an issue of great concern recently. The main
cause of death is the incident of collisions on passengers during a collision between
vehicles. One of the effort to reduce the risk by installing a structure that can absorb the
impact energy. A lot of research has been done on the use of thin-walled structures as
energy impact absorber. In this study the thin tube aluminum alloy is used as the
structure of energy absorber. A thin tube of 20 mm in diameter with a thickness of 0.5 mm
and 1 mm is subjected to a drop test with varying load heights. The kinetic energy
absorbed by the structure and the maximum deformation occurred is calculated the
energy efficiency absorbed per unit length. Drop test is conducted by using ANSYS
WORKBENCH 18.2 student version which software is based on finite element method.
The dropweight is modeled by a stainless steel cube 7.8 kg of weight The altitude varies 1
m, 2 m and 3 m. . From the results of this simulation it is found thatenery per crush length
sequentially are5317.662 J/m, 6024.821 J/m and 6246.636 J/m at heigh 1m ,2mand 3 m
the thickness is 1 mm. The thickness of 0.5 mm are 2377.077 J/m, 3023.196 J/m and
3538.99 J/m


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