Natural internode bamboo tubes are commonly used in engineering,and it is of great significance to investigate the impact resistance of such natural thin-walled tube structures.The impact resistance of natural bamboo tubes was investigated,and a finite element analysis was carried out with a split Hopkinson pressure bar(SHPB).The three-dimensional Hashin and Puck unidirectional fiber composite failure crite-rion was applied in ABAQUS and combined with the correction of the strain rate effect on strength to es-tablish a bamboo tube constitutive model to simulate the natural internode bamboo tubes under impact loading.The dynamic stress-strain curves and damage modes obtained were close to those obtained from the SHPB experiments,proving the accuracy of the finite element model.The results show that the experi-mental and simulated ultimate compressive strengths have a minimum error of 2.19 percent and a maxi-mum error of 8.68 percent;under different impact compression loads,the bamboo tubes show end face crushing,axial splitting,and other forms of damage;displacement,velocity,and acceleration responses at the nodes of the outer wall of the bamboo tubes increase with the increase of the impact load.The incident energy,reflected energy,absorbed energy,and specific absorbed energy all increase with time,whereas the transmitted energy does not.The peak load of internode bamboo tubes is significantly lower than that of GFRP thin-walled round tubes,but the specific absorbed energy is similar,indicating that internode bam-boo tubes are not suitable for high-speed impact protection fields that require large impact energy.The pre-liminary findings may provide some theoretical guidance for the use of bamboo tubes in engineering struc-tural protection.
internode bamboo tubeaxial impactimpact responseenergy absorption characteristicfi-nite element analysis
维普
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