Energy absorption behavior of metallic staggered double-sine-wave tubes under axial crushing

A new type of double-sine-wave tube which is improved from a traditional square tube by embedding the sinusoid corrugation of both transvers and axial directions on the surfaces with phase differences between the adjacent ones is proposed in this paper. Attention is focused on the energy-absorption behavior of the tube under axial crushing and to verify that it can significantly reduce the initial peak load and the magnitude of the fluctuant wave in load-displacement curve. A theoretical model based on rigid, perfectly plastic material idealization is adopted to predict the mean crushing load. Besides, the numerical simulation of the staggered double-sine-wave-tube under axial crushing is operated by using Hypermesh and Ls-dyna. The numerical results are good agreement with the theoretical predictions. Two typical examples of using the staggered double-sine wave tube to attenuate impact force are provided for verification of its good attenuation performance as an energy absorption structure.