侵徹載荷作用下雙層艙壁結構響應預報方法研究
[Abstract]:In modern naval warfare, warships are bound to be confronted with the problem of high speed fragment penetration and damage caused by the explosion of anti-ship missiles. The transverse bulkhead structure is the main anti-penetration protection structure [1], which is related to the safety of important parts such as ammunition cabin and supply tank of warship. As a new type of bulkhead structure, double-layer bulkhead structure is gradually adopted by modern ships because of its excellent penetration resistance. In this paper, the anti-penetration problem of double-layer bulkhead structure is simulated and forecasted, and a fast, simple, accurate and reliable response prediction method is proposed to ensure the safety and normal use of the ship. Improving ship vitality and combat effectiveness has important practical significance and military value. In this paper, the response prediction method of double-layer bulkhead structure under high velocity fragment penetration load is studied. This paper first studies the penetration theory and numerical simulation method, and compares the simulation results with the empirical formula to verify the reliability of the numerical method. The numerical simulation of the process of the double layer bulkhead structure is carried out, and the dynamic response process of the double layer bulkhead structure is analyzed. The sensitivity of the dynamic response of the bulkhead to different penetration load parameters is studied based on the analysis of the dynamic response process of the double layer bulkhead structure. Through theoretical analysis and numerical simulation, the parameters of empirical formula of fragment penetration into single layer target plate are modified, and the prediction formulas of residual velocity and energy absorption of bulkhead structure are obtained. Starting with different initial velocity and mass of fragments, finite element simulation is carried out to compare the results of simulation with those of prediction formula, which verifies the reliability of the response prediction method. The main work of this paper is as follows: (1) the penetration theory and numerical simulation method. In this paper, the classification and failure mode of projectile and the analysis model of classical penetration theory are summarized. The basic theory and analysis method of numerical method based on MSC/DYTRAN software in solving penetration problem are introduced. Finally, the residual velocity of the fragment at different initial velocities of fragments is obtained by numerical simulation, and the feasibility of the numerical method is verified by comparing the results with the empirical formula. (2) sensitivity analysis of penetration load parameters. Based on the numerical simulation of the double-layer bulkhead structure with high velocity fragments penetrating the corrugated core, the object of the study is the shape, initial velocity, mass, angle of attack and the yield stress parameters of the material. The sensitivity of the dynamic response results of double-layer bulkheads to these different penetration load parameters is studied, and the load parameters which are more typical or have a greater impact on the penetration response are finally selected. It lays a foundation for further study of response prediction method. (3) Research on response prediction of double-layer bulkhead structure under penetration load. The numerical simulation of the process of the fragment penetrating into the monolayer element target plate is carried out, and the diameter of the fragment penetrating the target plate and the thickness of the target plate slug block are calculated according to the results of the numerical calculation. Based on the empirical formula of residual velocity and energy absorption of fragment penetrating monolayer target plate, the formula is modified based on the results of numerical simulation, based on the relationship between the thickness and the diameter of the fragment pier and the ratio of flushing plug of the target plate to the thickness of the target plate, and based on the empirical formula of residual velocity and energy absorption of the fragment penetrating into the single-layer target plate, A prediction formula of residual velocity and energy absorption after a fragment penetration into a double-layer bulkhead structure is presented. (4) the prediction method of the response of a fragment penetrating a double-layer bulkhead structure is verified. Starting with different initial velocity and mass of fragments, taking the coarse ratio of fragment pier, residual velocity of fragment and energy absorption of bulkhead structure as the research objectives, the finite element simulation calculation is carried out, and the results of prediction formula are compared with that of numerical simulation. The reliability of the proposed response prediction method is verified.
【學位授予單位】:江蘇科技大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:U674.70
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