直柱型点阵结构在填充聚氨酯材料时的力学（抗爆）性能研究

发布时间：2018-01-09 23:04

本文关键词：直柱型点阵结构在填充聚氨酯材料时的力学（抗爆）性能研究　出处：《江苏科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：近几年来,随着材料制备以及机械加工技术的迅猛发展,复合材料点阵结构受到许多领域的广泛关注,尤其是国内外航空、航天飞行器和海军舰船等运载设备领域,复合材料点阵结构俨然已成为极具潜力的先进轻质高强多功能材料。因此,对于新型复合材料点阵结构的设计研究具有重要的工程意义。本文以直柱型点阵结构在填充聚氨酯材料时的结构形式作为研究对象,利用ANSYS/LS-DYNA有限元软件,模拟该复合材料点阵结构在空中爆炸载荷下的响应,分析其在各项参数改变的情况下,响应随之发生的改变,并从吸能的角度出发,比较该复材料点阵结构与其他形式的结构抗爆性能上的优劣,综合讨论得出该复合材料点阵结构具有优良的力学性能。本文主要研究工作及结论如下:(1)利用有限元软件ANSYS/LS-DYNA模拟空中爆炸,并将计算得到的峰值超压与经验公式进行比较,研究发现,网格密度对峰值超压的计算结果有一定的影响,具体规律是网格单元尺寸越小,计算结果与经验公式越接近。(2)介绍了流体—结构耦合算法,并以实体板在空中爆炸的响应作为算例,观察其吸能及变形情况。(3)本文在第四章中详细介绍了夹芯层高度、面板厚度改变时,直柱型点阵结构填充聚氨酯材料的结构形式在空中爆炸载荷下的响应,主要观察了其吸能和变形的计算结果,并发现随着结构质量的增加,变形和吸能都随之减小。(4)从吸能的角度比较了复合材料点阵结构与聚氨酯夹层板结构、实体板结构性能的优劣,并得出相同工况下复合材料点阵结构的抗爆性能相较于其他两者更为优秀的结论。(5)最后利用ANSYS有限元软件模拟结构在静态加载情况的响应,并综合比较了复合材料点阵结构、聚氨酯夹层板结构、实体板等结构的变形情况,得出复合材料点阵结构具有良好的刚度性能的结论。
[Abstract]:In recent years, with the rapid development of material preparation and machining technology, the lattice structure of composite materials has received extensive attention in many fields, especially in aviation at home and abroad. In the field of spaceflight vehicle and naval vessel, composite lattice structure has become an advanced lightweight and high-strength multifunctional material with great potential. It has important engineering significance for the design and research of new composite lattice structure. In this paper, the structure form of straight column lattice structure filled with polyurethane material is taken as the research object. ANSYS/LS-DYNA finite element software is used to simulate the response of the composite lattice structure under the explosion load in the air, and the response of the composite lattice structure is analyzed when the parameters change. And from the point of view of energy absorption, the advantages and disadvantages of the composite lattice structure and other forms of anti-explosion performance are compared. It is concluded that the composite lattice structure has excellent mechanical properties. The main work and conclusions of this paper are as follows: (1) the finite element software ANSYS/LS-DYNA is used to simulate the aerial explosion. By comparing the calculated peak overpressure with the empirical formula, it is found that the grid density has a certain influence on the calculation results of the peak overpressure, and the specific rule is that the smaller the size of the grid cell is. The fluid-structure coupling algorithm is introduced, and the response of solid plate in air explosion is taken as an example. In Chapter 4th, the height of the sandwich layer and the thickness of the panel are introduced in detail. The response of polyurethane filled with straight column lattice structure under the explosion load in the air was studied. The results of energy absorption and deformation were observed, and it was found that the structure quality increased with the increase of the structure mass. Deformation and energy absorption are reduced. 4) from the point of view of energy absorption, the advantages and disadvantages of composite lattice structure, polyurethane sandwich plate structure and solid plate structure are compared. The conclusion that the anti-explosion performance of the composite lattice structure is better than the other two under the same working condition is obtained. Finally, the response of the structure under static loading is simulated by ANSYS finite element software. The deformation of composite lattice structure, polyurethane sandwich plate structure and solid plate structure are compared, and the conclusion that the composite lattice structure has good stiffness performance is obtained.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33

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