The Destroy Mechanism Study Of Plate Structure By Underwater Explosion

《esearches on the damage mechanism of complex board-shell structure due to the impact loads》 is imbursed by both Chinese engineering and physics academy and native physical science fund. The paper which has finished some work of research task has investigated the dynamics response and damage form large dissymmetrical armor ships due to the impact loads of underwater explode, and analyze the possible damage situation and mechanical conditions, supply system reference for design parameter and defend of large armor ships. Main content of this thesis is as following:1. Computing the underwater explode loads on the basis of underwater explode phenomena. The paper calculate the pulsatile loads due to bleb movement, the whole underwater explode loads from impact wave to bleb ripple are derived. When underwater explodes begin, there are two kinds of pressure fields around the explode center. Firstly, the pressure characteristic of freedom field is researched when there are barriers in the water; secondly, analyze how the sport and distortion of structure influence pressure field around when dynamic load which act on the aquatic structure is confirmed, namely, liquid-solid coupling.2. That how underwater contact explode destroy armor plate is analyzed on terms of theory. Predigested mechanics model is derived, the damage of armor plate due to underwater contact explode load is analyzed by the quality, movement, energy conversation laws. The formula of minimal amount dynamite is obtained when transfixion of armor plate take place, and it is compared with the experience formula to attaincalculation formula of plate thickness and radius according to a certain of dynamite and average radius of arm plate damage field when the amount of dynamite is different.3. Using finite element calculation software " Ls-Dyna" , finite element calculation and numerical simulation are carried on when underwater contact explode load act on single layer plate and double layer plate. Dynamic model is finished according to predigested model when state equation of material is confirmed. Numerical calculation and simulation are developed on the basis of theory analysis, numerical result and theory analysis are compared and discussed.