1. 中国船舶科学研究中心, 江苏 无锡 214082
2. 军事科学院国防工程研究院 工程防护研究所, 河南 洛阳 471023
*E-mail : ustczhanglei@163.com
收稿:2022-01-12,
网络出版:2023-07-25,
纸质出版:2023-04-28
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沈超, 张磊, 周章涛, 等. 水下近距和接触爆炸载荷作用下板架结构动态响应机理[J]. 兵工学报, 2023,44(4):1050-1061.
Chao SHEN, Lei ZHANG, Zhangtao ZHOU, et al. Mechanism of Dynamic Responses of Grillage Structures under Loads of Close-in and Contact Underwater Explosions[J]. Acta Armamentarii, 2023, 44(4): 1050-1061.
沈超, 张磊, 周章涛, 等. 水下近距和接触爆炸载荷作用下板架结构动态响应机理[J]. 兵工学报, 2023,44(4):1050-1061. DOI: 10.12382/bgxb.2022.0037.
Chao SHEN, Lei ZHANG, Zhangtao ZHOU, et al. Mechanism of Dynamic Responses of Grillage Structures under Loads of Close-in and Contact Underwater Explosions[J]. Acta Armamentarii, 2023, 44(4): 1050-1061. DOI: 10.12382/bgxb.2022.0037.
以某型水面舰船防护结构的膨胀舱为原型设计板架试验模型
依药量和爆距不同进行 7个工况的水下近距和接触爆炸试验。采用光子多普勒测速系统测量模型典型位置的速度时程
收集试验产生的飞片
并对试验后板架的破口形态进行记录。结合数值方法对试验结果进行对比分析
验证试验结果的一般性及数值计算方法的准确性。根据试验和数值计算结果对水下近距和接触爆炸载荷作用下板架结构动态响应开展研究。研究结果表明:板架结构容易在加强筋、隔板处发生剪切或撕裂破坏形成飞片
飞片的形成与药量、爆距、板架的结构形式均有密切关系;爆炸载荷驱动下板面上各点速度以爆心投影点为中心沿板面向外呈指数衰减趋势;当爆距大于2倍装药半径后
不同药量在相同的距径比下
板架结构上正入射点处速度峰值基本相当。
This paper designs grillage structure models based on a specific protective structure of a surface ship
and conducts close-in and contact underwater explosion experiments on 10 grillage models under 7 working conditions with various charges and distances. The velocities of typical points are measured with the Photonic Doppler Velocimetry system
the fragments of the grillage structure are gathered
and the damage forms after each experiment are recorded. The experimental results compare well with the numerical results
verifying the generality of the experiment and the accuracy of the simulation. The analyses of experimental and numerical results reveal several conclusions. The grillage structure is susceptible to shear and tear at reinforcing ribs and diaphragm plates
leading to the formation of fragments. The number and weight of fragments depend on the explosive charges
distances
and structures of the grillage. The velocities of points on the surface of the grillage decrease exponentially with increasing distance between the measuring point and center point. The center point is the projection point of the explosive charge on the grillage surface. When the ratio of the explosion distance to explosive charge radius is not less than 2
the velocity of center point remains nearly constant
even though the explosive charge mass changes.
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TANG T , ZHU X , WEI Z B , et al. Movement of air backed plane plates subjected to shock wave of underwater explosion [J ] . Acta Armamentarii , 2012 , 33 ( 7 ): 831 - 835 . (in Chinese) The wave theoretical formulae about the response of air backed plane plate to the shock wave of underwater explosion were got by applying one dimension plane wave theory. By comparing the wave theory formulae with the Taylor formula, it shows that two results are coincident when the impedance of plate is far higher than that of water. As the elastic modulus and density of plate decrease, the error of Taylor formula increases, but the wave theoretical formulas are still accurate. If the mass of plate and the shock wave of underwater explosion are fixed, the maximum velocity of plate is inversely proportional to the elastic modulus and density of plate. By comparing the responses of plates with different thicknesses to the same shock wave of underwater explosion, it is shown that the maximum velocity of plate is inversely proportional to the thickness of plate, but a good vibration isolation effect can be reached by increasing the thickness of plate.
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KAMBOUCHEV N , NOELS L , RADOVITZKY R . Nonlinear compressibility effects in fluid-structure interaction and their implications on the air-blast loading of structures [J ] . Journal of Applied Physics , 2006 , 100 ( 6 ): 063519 . DOI: 10.1063/1.2349483 http://doi.org/10.1063/1.2349483 https://pubs.aip.org/jap/article/100/6/063519/370264/Nonlinear-compressibility-effects-in-fluid https://pubs.aip.org/jap/article/100/6/063519/370264/Nonlinear-compressibility-effects-in-fluid The impulse imparted by a blast wave to a freestanding solid plate is studied analytically and numerically focusing on the case in which nonlinear compressibility effects in the fluid are important, as is the case for explosions in air. The analysis furnishes, in effect, an extension of Taylor’s pioneering contribution to the understanding of the influence of fluid-structure interaction (FSI) on the blast loading of structures [The Scientific Papers of Sir Geoffrey Ingram Taylor, edited by G. K. Batchelor (Cambridge University Press, Cambridge, 1963), Vol. III, pp. 287–303] to the nonlinear range. The limiting cases of extremely heavy and extremely light plates are explored analytically for arbitrary blast intensity, from where it is concluded that a modified nondimensional parameter representing the mass of compressed fluid relative to the mass of the plate governs the FSI. The intermediate asymptotic FSI regime is studied using a numerical method based on a Lagrangian formulation of the Euler equations of compressible flow and conventional shock-capturing techniques. Based on the analytical and numerical results, an approximate formula describing the entire range of relevant FSI conditions is proposed. The main conclusion of this work is that nonlinear fluid compressibility further enhances the beneficial effects of FSI in reducing the impulse transmitted to the structure. More specifically, it is found that transmitted impulse reductions due to FSI when compared to those obtained ignoring FSI effects are more significant than in the acoustic limit. This result can be advantageously exploited in the design and optimization of structures with increased blast resistance.
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