In the present paper, experimental and theoretical studies ondynamic plastic buckling of circular cylindrical shells under axialimpact are carried out. Experiments of circular cylindrical shellsunder axial impact are finished on Hopkinson bar and drop hammerapparatus. From the experiments, the first critical velocitycorresponding to the axisymmetric buckling mode and the secondcritical velocity corresponding to the non-axisymmetric buckling modeare determined. Two different kinds of non-axis-symmetric bucklingmodes oval-shaped and triangle shaped are founded. The buckling modesunder two loading manners, viz. by small mass but high velocity andlarge mass with low velocity using Hopkinson bar and drop hammer, aredifferent. Their critical energies are also discussed. The bucklingmode considering axial and circumferential coordinate is assumed toanalyze the plastic buckling problem theoretically. By using theanalysis of amplification functions method, the critical velocitiescorresponding to axisymmetric or non-axisymmetric buckling modes areobtained. The relationships between critical velocities andradius-to-thickness ratios are also discussed.
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