Numerical simulation of optimization of reinforced double-layer cylindrical shell structure under underwater explosion loading
To study the damage characteristics of reinforced double-layer cylindrical shells under underwater explosive loads,finite element calculation methods are used to construct models of 5-section and 10-section reinforced double-layer cylindrical shells.A comparative study is conducted on the load characteristics and response characteristics of 5-section and 10-section reinforced cylindrical shell structures under different impact factors and distances from the explosion source,selecting typical observation points to measure acceleration,velocity,and displacement curves.The results show:under working condition one,the model structure deformation is most pronounced;under three conditions,underwater explosive loads mostly act on the outer shell of the reinforced double-layer cylindrical shell,with the outer shell bearing most of the explosion impact stress and providing good protection for the inner cylindrical shell.The two structural impact characteristics are similar,with the impact resistance of the 10-section reinforced cylindrical shell being superior to the 5-section reinforced cylindrical shell;acceleration is mainly in the x-direction,with the x-direction acceleration reaching a peak shortly before 0.001 s after the explosion and then rapidly oscillating and decreasing.The y-direction acceleration changes are minimal,and the z-direction acceleration remains unchanged;the velocity peak at the center point of the inner and outer shell spines of the 5-section reinforced double-layer cylindrical shell model is greater than that at the two ends measurement points,and after the explosion,it quickly reaches the velocity peak,with the velocity peak of the inner shell measurement point always being smaller than that of the outer shell;displacement increases rapidly to a peak and then decreases to a fixed value.The larger the impact factor and the closer the distance from the explosion source,the greater the impact of the load on the cylindrical shell structure;under the same impact factor,with constant overall mass,the more reinforcements there are,the stronger the impact resistance of the reinforced double-layer cylindrical shell,and the more pronounced the impact resistance effect.
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