Ship Structural Design Of Longigudinal Boxed Beam And Numerical Analysis Of Inner Explosion

warship will suffer great damage of large plastic deformation, crevasse and even sinking after armour-piercingly attacked by various anti-ship weapons. Therefore the research of warship anti-explosion and vitality draws great attention. The design of longitudinal boxed beam structure on warship's main deck has been confirm of bearing outer explosion blast wave load of 150kg dymamite by Germany F124 destroyer, which shows great promotion of warship anti-explosion ability. The main idea of this paper is to discuss the contribution of longitudinal boxed beam to warship anti-explosion ability under the condition of inner explosion.1. This paper starts with the basic theory of explosion and the generation and transmission of blast wave are studied. MSC.Dytran, the finite element analysis software, is entroduced and the transmission procedure of air blast wave is calculated. The results accord with that of empirical formulae. 2. The influence of longitudinal stiffeners'coupling degree of two local deck grillage facing blast load on structure response is analyzed based on MSC.Dytran, and is compared to the results of fully coupled models. The results indicate that reducing the coupling degree of weak stiffeners can increase computational efficiency while maintaining accuracy.3. A warship's parallel body section is designed totally and particularly based on GJB 4000-2000. The design results meet the rule's demand of strength and stability.4. The longitudinal boxed beam on general warship's main deck is designed based on the corresponding structure of Germany F124 destroyer. The influence of added longitudinal boxed beam on section area, moment of inertia, deck section modulus, etc is calculated by MARS. The conventional section FE model and that with longitudinal boxed beam are built. The contribution of longitudinal boxed beam to warship anti-explosion ability under various working condition is evaluated by changing the dynamite position and mass. The results indicate that the longitudinal boxed beam can improve the anti-explosion ability of main deck effectively.