The protective mechanism of pyramid lattice on submarine subjected to undex

Abstract

<p indent=0mm>The pyramid lattice sandwich shell is applied to the non-pressure hull of conventional submarine to reduce the damage when it is attacked by torpedo in close range. The design of pyramid lattice sandwich shell on conventional submarine is put forward. MSC.NASTRAN was used to study the anti-high hydrostatic performance of submarine hull after pyramid lattice sandwich shell was installed. The simulation results show that the improved submarine cabin structure is in a safe range under the designed water depth. Then MSC.DYTRAN was used to study the anti-explosion effect of the pyramid lattice sandwich shell as the outer protective structure of submarine. The results show that when the <sc>100 kg</sc> TNT charge explodes at <sc>3 m</sc> on the side of the submarine cabin, taking the damaged deformation as evaluation parameter, the anti-explosion performance of the submarine’s pressure hull mounted with pyramid lattice sandwich shell is 69.7% better than that of conventional submarine. The anti-explosion performance of the shell plate and upper deck was improved by 49.8% and 55.8%, respectively. Compared with solid plates, when the fluid-solid coupling parameter is greater than 10 and the ratio of core strength to peak pressure of shock wave is less than 0.15, the core layer can reduce the total incident impulse by more than 60%. The pyramid lattice sandwich shell used in submarine can not only meet the conditions of high hydrostatic pressure, but also greatly improve the anti-explosion performance of submarine hull structure, which has significant application value.