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Today, in order to reduce the damage caused by the collision, energy absorbers are used. Thin-walled structures are most popular as energy absorbent that are used in various forms. In this research, the cylindrical absorber made of expanded metal sheets (expanded metal tube) under impact loading has been examined. Expanded metal sheets due to their low weight, effective collapse mechanism has a high energy absorption capacity. Two types of absorbers with different cells angle were examined. First, the absorber with cell angle α =0 and then the absorber with angle cell α =90. Tests are done by drop hammer device. The output of device is acceleration - time Diagram which is shown by Accelerometer that is located on the picky mass. In this study the type of collapse, force - displacement diagram and effective parameters has been investigated. From the obtained results it was observed that the absorber with cell angle α =0, have symmetric collapse and had high energy absorption capacity but the absorber with cell angle α =90, had global buckling and the energy absorption value was not suitable.

Keywords: expanded metal tube absorber, Energy absorption capacity, dynamic axial loading, impact force

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