Abstract
It is of great significance for the protective design of submarine to study the influences of coverings on the damage characteristics of single and double cylindrical shells subjected to underwater contact explosions. The SPH models of single and double cylindrical shells coated with foam silicone rubber are established to analyze shockwave propagation, damage characteristics, and elastoplastic responses, which provides reasonable parameters of covering position and thickness. The results can be concluded as follows: the superposition of multiple waves may cause the inhomogeneity and discontinuity; for the single cylindrical shell with inner or outer coverings, the damage mode is mainly tensile and shear failure is caused by detonation waves and detonation products; compared with out-covering approach, the in-covering approach has better antishock performance; the best protective effect comes out when the thickness of covering is close to that of the shell; as for the double cylindrical shell without interlayer water, the destruction of inner shell mainly results from the puncture of high-speed fragments from the outer shell, so for the outer shell, out-covering is a better choice; however, since the interlayer water is very effective in protecting the inner shell, in-covering will be better for the inner shell.
Highlights
With the development of precision-guided weapons, the probability of naval structures being attacked/damaged by underwater contact explosion increases gradually
Submarine is always coated with multiple acoustic coverings [1] in order to improve the concealment, and it is of great significance to study the influences of the coverings and their antishock performance
Numerous researches on the covering performance were carried out and can be classified into mainly two categories: those on the acoustic performance such as the vibration and acoustic radiation of finite submerged cylindrical shell [2] and the acoustic radiation of laminated composite shells [3], and those on the antishock performance such as the dynamic response of coated double-hull subjected to underwater explosion [4], antishock characteristics of the sandwich structure subjected to underwater explosion [5, 6], the theoretical and experimental researches on antishock characteristics of a new cavity structure [7,8,9], the analyses of structural dynamic responses and failure modes based on finite element program [10], and the antishock performance of plate-frame covering [11, 12]
Summary
With the development of precision-guided weapons, the probability of naval structures being attacked/damaged by underwater contact explosion increases gradually. Submarine is always coated with multiple acoustic coverings [1] in order to improve the concealment, and it is of great significance to study the influences of the coverings and their antishock performance. Shock and Vibration the coated single and double cylindrical shells will be modeled with SPH method, the results of which will be compared with those of AUTODYN to verify the effectiveness of the present SPH model; on the basis of these, the parameters of covering position and covering thickness will be considered to discuss the influences on the structural damage of single and double cylindrical shells; more reasonable parameters of the coverings will be presented in terms of antishock performances to give a reference for the structural design of submarines
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