Study On Local Destroy Of Ship Structure Under Blasting And Impacting

A warship involved in a battle would encounter the assault from enemy anti-warship weapons. In the light of its destructiveness, such assaults can be divided into contact explosion and non-contact explosion, and the latter can be divided into that in the air and that under water. Non-contact explosion mainly causes destruction to a warship's structure, apparatus and equipments. The present paper, with its focus on warship dynamical response problems under non-contact explosion that in the air and that under water, researches on the some issues by virtue of theoretical analysis and numerical computation. The main researches and conclusions in the paper are as follows:1) Study on the basic theory of blast wave: the CJ model of blast wave, two-dimensional model of blast wave, blast debris and state of equation of solid as well as the transmission and interaction of blast wave.2) Study on the rules of under water non-contact explosion's formation and transmission. Using non-linear dynamic software LS-DYNA to simulate the whole process of underwater explosion's transmission, and analysis and compare the results of underwater explosion response of fixed square plate.3) The process of underwater explosion accompanied by the phenomenon of bubble fluctuating, this paper presents 4 formulas according to this phenomenon, which are the theoretical foundation of ship structural response of underwater explosion.4) Numerical simulation on dynamic response of whole ship structure underwater explosion is carried out, and the properties of the structure response are analyzed. The ship and water are fluid-solid coupled, the rules of ship structure random location parameters such as stress, strain, velocity, acceleration and some other ones' variation along time are obtained, and energy absorption of different components are analyzed. Some suggestions that should be paid attention to on numerical simulation are present.5) Using LS-DYNA to study on the response of plate and ship, the constitutive equation and equation of state are confirmed, the calculation required model are created according to the simplified model, the numerical simulation and calculation are carried out on the basis of theoretical analysis, the influence of structure deformation under explosion in different locations and different distances, the corresponding results are obtained. The conclusion and suggestions given in this paper have reference value to ship anti-explosion research and structure design of ship.