Abstract
Expansion tube absorber is a kind of excellent energy absorption devices owing to its good mechanical characteristics. In this study, the two-dimensional axisymmetric finite element models of expansion tube were established to simulate the influence of length of cone area and radius of cylindrical area on the mechanical properties of expansion tube. It is found that the expansion force increases significantly with the decrease of length of cone area in axial direction. Then, the expansion force reaches a stable value when the semi angle of cone area reaches 45°. The expansion force increases significantly when the radius of cylindrical area increases, but the trend of expansion force-displacement curves does not change. The influence of length of cone area and radius of cylindrical area on the mechanical properties of expansion tube is very regular. The mechanical properties of the expansion tube as absorber are very controllable and versatile, demonstrating that the performance of expansion tube as energy absorber is very reliable.
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