Effects of sacrificial coatings on stiffened double cylindrical shells subjected to underwater blasts

Yin, Changbin; Jin, Zeyu; Chen, Yong; Hu, Hua

doi:10.1016/j.ijimpeng.2019.103412

Cited by 15 publications

(2 citation statements)

References 35 publications

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“…With the widespread use of cabins near shipboard [ 1 , 2 ] and protection materials [ 3 , 4 , 5 , 6 ] for the design of warships, their explosion and shock resistance [ 7 , 8 , 9 ] is rapidly improved, which makes it very difficult for blast warheads to cause destructive attacks. However, due to the limitation of the dimensions of the warheads, the effect of increasing the charge weight on the improvement of the warhead power is minimal.…”

Section: Introductionmentioning

confidence: 99%

Formation of Shaped Charge Projectile in Air and Water

Zhang

Wang

et al. 2022

Materials

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With the improvement of the antiknock performance of warships, shaped charge warheads have been focused on and widely used to design underwater weapons. In order to cause efficient damage to warships, it is of great significance to study the formation of shaped charge projectiles in air and water. This paper uses Euler governing equations to establish numerical models of shaped charges subjected to air and underwater explosions. The formation and the movement of Explosively Formed Projectiles (EFPs) in different media for three cases: air explosion and underwater explosions with and without air cavities are discussed. First, the velocity distributions of EFPs in the formation process are discussed. Then, the empirical coefficient of the maximum head velocity of EFPs in air is obtained by simulations of air explosions of shaped charges with different types of explosives. The obtained results agree well with the practical solution, which validates the numerical model. Further, this empirical coefficient in water is deduced. After that, the evolutions of the head velocity of EFPs in different media for the above three cases are further compared and analyzed. The fitting formulas of velocity attenuation of EFPs, which form and move in different media, are gained. The obtained results can provide a theoretical basis and numerical support for the design of underwater weapons.

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Section: Introductionmentioning

confidence: 99%

Formation of Shaped Charge Projectile in Air and Water

Zhang

Wang

et al. 2022

Materials

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“…The nonlinear dynamic behavior of a laminated composite plate with sandwich stiffener (with four layers carbon/epoxy and the stiffeners composed of carbon/epoxy face sheets and polypropylene honeycomb core) subjected to the non-uniform blast load was investigated by Balkan et al in [2]. From comparison results in [3] between the bare hull and the equivalent model which increases the thickness of the thin or pressure hulls under the same mass conditions indicate that the method of using a sacrificial coating is more effective in improving the blast resistance of the structure. Study [4] presented experimental and numerical investigations into dynamic responses of aluminum foam core sandwich panels subjected to localize air blast loading by Chen et al The effect of through-the-thickness stitching on the blast resistance of sandwich panels was studied both experimentally and numerically by Guan et al in [5], with the blast resistance of the sandwich panels was modelled using finite element techniques.…”

Section: Introductionmentioning

confidence: 99%

Impact of blast and mechanical loads on the shear deformable stiffened sandwich plate with an auxetic core layer in thermal environment

Anh

Quang

Duc

et al. 2021

Jnl of Sandwich Structures & Materials

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By using the first order shear deformation theory (FSTD), this paper presents the results of the nonlinear dynamic behavior and natural frequencies of sandwich plate supported by elastic foundations in thermal environment and subjected to mechanical load and blast loading. This work takes advantage of the sandwich plate configuration with three layers: graphene platelet –reinforced composite (GPL) layer – auxetic layer – FGM layer, to analyze the dynamic and vibration problem, in which the auxetic core layer has a negative Poisson's ratios and the FGM layer is reinforced by stiffeners made of full metal or full ceramic depending on a situation of stiffeners at the metal-rich or ceramic-rich side of the plate respectively. Corresponding to the combination of material layers, the mechanical quantities of the problem are processed and calculated to suit the structure and reinforcement conditions. Numerical results are provided to explore the influences of geometrical parameters, elastic foundation parameters, GPL volume fraction, blast and mechanical loads on the nonlinear dynamic behavior and vibration of sandwich plate resting on elastic foundation and in thermal environment. In addition, the study is not only assumed that the material properties depend on environment temperature variation, but also considered the thermal stresses in the stiffeners, as well as considered the effect of imperfections in the original shape of the structure.

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