【作者】 万育龙；

【导师】 程远胜；

【作者基本信息】 华中科技大学 ， 船舶与海洋结构物设计制造， 2007， 硕士

【摘要】 舰船生命力是舰船的一个重要性能指标。现代军事对研究反舰武器的破坏力和舰船的抗爆抗冲能力提出了越来越高的要求。开展新型舰船防护结构研究对于提高舰船的生命力及战斗力具有重要的军事意义。目前,此类问题的研究通常采用实验与有限元仿真相结合的方法开展。金属薄壁管是一种有效的吸能防护元件,并且在吸能体系中得到了广泛应用。本文借助有限元软件ANSYS/LS-DYNA,首先对轴向冲击下的简单直壁和锥壁薄壁管结构的吸能特性进行了研究,分析了接触摩擦系数对仿真结果的影响,然后基于提高结构的吸能能力的考虑,提出了几种锥形薄壁组合结构和具有引发机制的直壁组合结构,并进行了相应的吸能特性数值仿真分析。最后从初始峰值载荷、平均压溃载荷、比吸能几个方面对各种结构进行了综合对比分析,数值计算结果表明薄壁组合结构的吸能能力较之原始结构有了显著的提高。本文接着借助有限元软件ANSYS/LS-DYNA,对爆炸载荷下平面舱壁的响应进行了数值仿真,计算结果与经验公式吻合良好。然后提出在平面舱壁后一定距离处放置两根十字交叉排列的挡杆,组成一种新型挡杆式组合舱壁结构。本文进一步从最大残余挠度、吸能特性、极限承载能力几个方面研究了冲击系数与挡杆形式对新型组合舱壁结构抗爆炸性能的影响。最后将平面舱壁结构与组合舱壁结构的抗爆炸性能进行了对比分析,研究表明新型挡杆式组合舱壁结构较传统平面舱壁结构的抗爆炸性能有了较大地提高。更多还原

【Abstract】 Warship Survivability is a key performance indicator. As for modern military, there is a great demand for study on the destructive power of anti-ship weapons capabilities and anti-blast and anti-blast performance of warships. The research of the development in the new pattern ship protective structures has some important military significance in order to improve the vitality and combat ability. Currently, experiment and finite element simulation and their combination are usually adopted to investigate such problems.Metallic thin-walled tube is a sort of effective energy absorbed structure and is widely applied in energy absorbed systems. The energy absorbed characteristic of the simple square straight and tapered tubes subjected to axial impact were studied firstly in this thesis. The effect of contacting friction factors on the simulation results was then analyzed. Then several tapered built-up structures and straight built-up structures with triggering were introduced from the view of energy absorption capability. Finally, a comprehensive comparative analysis of all the structures was carried out from initial peak load, mean crush load, specific energy absorption. The numerical results have indicated that the absorption capability of built-up thin-walled structures is significantly improved compared with that of the original structures.In the thesis, the numerical simulation on the response of plate bulkhead subject to explosive load was studied by using finite element software ANSYS/LS-DYNA. The simulation results fit very well with the theory formulas. Then a new pattern of built-up bulkhead structure, which is composed of two cross-arranged barriers laid at certain distance after the plate bulkhead and the common plate bulkhead is developed. The anti-blast performance of such new pattern bulkhead structure is further studied from permanent deformation, energy absorption and ultimate bearing capacity. In the analysis, the effects of impact factors and form of barrier structures on anti-blast performance of the structures are analyzed. A comprehensive comparative analysis of the plate bulkhead and built-up bulkhead was carried out from the anti-blast performance. Numerical results show that the anti-blast performance of this new pattern of built-up bulkhead has been greatly improved compared with that of the traditional plate bulkhead structure.更多还原