Experiment and Numerical Simulation of Damage Response of Polyurea Coated Liquid-Filled Cylindrical Shell Subjected to Blast Load
In order to evaluate the protective effect of polyurea on liquid-filled containers,a combina-tion of experimental and numerical simulation methods was used to conduct detailed analysis of the dynam-ic response behavior of polyurea coated liquid-filled cylindrical shell structure under explosive loading.The macro/micro damage characteristics and the dynamic response process of polyurea coated liquid storage containers were obtained.The results showed that,under close-range explosion loading,thin-walled cylin-drical liquid storage shells primarily experience localized damage,and polyurea can effectively enhance the explosion resistance of these cylindrical liquid storage shells.When the stand-off distance Z is 0.134 m/kg1/3,the polyurea absorbs relatively more internal energy at the initial stage of the shock impact from explosion products,and the subsequent process mainly converts and absorbs energy from the kinetic energy of the liquid medium and the internal energy of aluminum tube.As the thickness of polyurea in-creased from 0 mm to 6 mm,the total amount of energy absorbed by polyurea significantly increased,while the energy absorbed by aluminum tubes shows a decreasing trend,indicating that polyurea can share some of the energy and reduce the energy absorbed by aluminum tubes to increase the protective capacity of the container.The energy absorption per unit thickness of polyurea shows an increasing trend with the increase of polyurea thickness.The synergistic deformation ability of polyurea and substrate is also the principal factor for improving blast protection performance.