Based on the hypothesis that multi-corner and multi-cell structures can effectively improve energy absorption behavior, this paper designed a circumferentially corrugated tube (MCCT) for absorption. The MCCT was as variable thickness form to study influence of materials distribution cross section performance investigated under impact condition with finite element simulation validated by drop ha...

It is necessary to reduce the weight of components while maintaining or improving their mechanical properties withstand dynamic loads in lightweight structures. In this study, heat treatment and a trigger mechanism were implemented for thin-walled tube aluminium increase energy absorption reducing peak crushing force. Different geometries locations proposed deformation controlled manner, combin...

Under torsion and beyond the buckling point, multi-walled carbon nanotubes MWCNTs develop a periodic wave-like rippling morphology. Here, we show that torsional rippling deformations can be accurately described by a simple sinusoidal shape function. Combining this observation with the geometry optimization, we develop an effective coarse-grained model that reproduces the complex nonlinear mecha...

Marchand and Duffy tested thin-walled steel tubes in a split Hopkinson torsion bar at a nominal strain-rate of approximately 1600/s and could not determine conclusively whether a shear band initiating at a point in the tube propagated around the circumference in one direction or in both directions. They estimated the speed of propagation to be 520 m/s in the former case and 260 m/s in the latte...

The acoustic radiation from a source inside hard-walled semi-infinite duct or tube, such as for ducted fans and rotors, is investigated. In particular study of cutoff modes, which have the potential to affect far-field pressure sources close open end, presented. A large amount work has been done mathematically experimentally investigate propagating cuton modes. However, there very little publis...