Energy Absorption Of Composite Bellows With Origami Pattern

Fiber reinforced plastics(FRP)has demonstrated significant promise to improve the performance-to-weight ratio in automotive and aerospace sectors.Nevertheless,traditional thin-walled FRP tubes still have several defects such as a high initial peak force with a relatively low mean crushing force and unstable collapse mode,which significantly reduce their performance when used as energy absorption devices.In this thesis,the fulldiamond origami pattern was introduced to thin-walled CFRP and hybrid CFRP/KFRP tubes,respectively.The effect of the origami patterns on the energy absorption properties and collapse modes of these tubes subjected to quasi-static axial loads was investigated both experimentally and numerically.A comprehensive parametric study on the geometrical parameters and ply stacking sequence of pre-folded FRP tubes was conducted,which shows that FRP pre-folded tube can effectively reduce the initial peak forces while increasing the overall energy absorption capacity.Besides,CFRP thin-walled tube with full-diamond origami pattern was introduced to as the core of the CFRP sandwich cylinder,experiment studies over axial compression,axial compression with introversion cap and threepoint bending were carried out,then we give a comprehensive analysis of the energy absorption behavior of CFRP sandwich cylinder in these three cases.Experiment results indicate that the CFRP sandwich cylinders show a great performance in energy absorption and with an excellent compressive stiffness.