Research On The Cylindrical Shell Structures With Hole Suffering Underwater Explosion

The research on anti-explosion and anti-shock of submarine has always been an important part of ship survivability. The submarine is usually regarded as cylindrical shell because of the similarity on structure. At present, the plastic deformation researches of missile holes when submarine suffering underwater blast loading were less made. Based on this engineering background , this paper adopted finite element method to analyze the holes on both the single layer and double layers cylindrical shell involving strength. At last, the blast bubble shape changing forms near the cylindrical shell are also studied.Firstly, the paper described the underwater explosion bubble dynamics and the progress of the stress concentration from three aspects, theory, trail and numerical simulation. The best research method was found by comparison of advantages and disadvantages.Secondly, the plastic deformation was analyzed of the single layer and double layers cylindrical shell suffering underwater blast based on finite element method. The affection of the hole on the structure was found compared with no hole one and by changing impulsive factor and hydrostatic pressure. Through comparison of different dimensionless radiuses, the most probably damaged one was confirmed. Then to the double layers cylindrical shell, this paper discussed plastic damage deformation because of the water between two sides.At last, the bubble dynamic characteristics which is upon the plate were analyzed by changing the holes radius and blasting distances, and finally the curves of different parameters were drawn. Based on this, the structure was replaced by single layer cylindrical shell with one hole on it, and some significant conclusions were made.