Payam Siyahpoosh - MSc student, Mechanical Engineering Department, Yasouj University, Yasouj, Iran
Abbas Niknejad - Assistant professor, Mechanical Engineering Department, Yasouj University, Yasouj, Iran

This article studies energy absorption behavior of expansion tubes under axial compression load by a conical die. For this purpose, some specimens were prepared with different diameters and wall thicknesses. The effects of expansion ratio, punch angle, diameter and friction on the axial load and energy absorption of the tubes were studied. Based on the experimental results, it is concluded that the expansion process on the circular tubes as an energy absorber has good efficiency in the quasi–static loading condition.

Axial load, Energy absorption, Forming, Thin–walled structure, Tube expansion