Dynamic Damage of Polyurea-Coated Vertical Cylindrical Steel Storage Tanks Under Repeated Blast Loads
Vertical cylindrical steel storage tanks,which are usually used as oil storage facilities,are prone to overall deformation or local damage failure in the event of blast or other strong dynamic loads,which will result in significant losses.In order to address this issue,this paper proposes a rapid processing method in which the polyurea spraying is applied to enhance the blast resistance of existing steel tanks,and some blast resistance experiments on sprayed composite tanks have been conducted.The experimental results demonstrate that the polyurea layer can effectively absorb a portion of the energy of the blast prod-ucts under the action of repeated explosion loads,resulting in a reduction of 12.3％in the transverse width of the concave yield surface of the coated tank and a reduction of 12.5％in the maximum deflection value.A numerical simulation with LS-DYNA was employed to reproduce the experiment.The numerical simu-lation results were then compared with the experiment in terms of the shape of the concave yield surface and the depth of the tank wall collapse.The result of this comparison demonstrates that the numerical simulation is able to accurately reproduce the experiment,thereby providing evidence of its reliability.The further investigations reveals that the polyurea layer decreases and diffuses the localized strong impact of the repeated blast loads,reduces the local impact compression capacity of the shock wave on the tank wall,and attenuates the stress concentration on the tank wall and weld joints,which can prevent parts of the tank wall from entering the plastic phase and producing local failure.Furthermore,the polyurea layer can reduce the peak kinetic energy of the tank by 27.8％under the action of repeated explosive loads,reduce the overall degree of collapse of the tank,and protect the structural integrity of the tank.
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