【作者】 高畅；

【导师】 赵耀；

【作者基本信息】 华中科技大学 ， 船舶与海洋工程， 2013， 硕士

【摘要】 在近几十年里，高比强度、高比刚度的复合材料，特别是由纤维增强塑料面板和轻质材料夹层组合得到的夹层结构，刷新了船舶建造行业的经典标准，并在船舶的设计和生产方式方面引起了巨大的变革。然而受我国复合材料制造发展的滞后性影响，复合材料船舶结构的设计、建造与国际水平相比落后较大。我国对于复合材料船舶结构的有限元分析近些年才开始发展，特别是对于大型泡沫夹层复合材料船舶与海洋结构物的仿真工作，鲜有论文公开发表，严重影响了泡沫夹层复合材料船舶行业的发展，因此泡沫夹层复合材料如何进行大型结构物的数值仿真分析与方法应用相关研究是十分必要的。本文从经典夹层板壳理论出发，简要介绍了常见夹层结构的设计方法与经验。在前期工作经验上，选用ANSYS仿真平台，以SHELL91“三明治”壳单元为基础建立仿真方法。面对船用泡沫夹层复合材料结构的特殊性，建立一种基于经典夹层结构设计思路的等效参数换算体系，形成等效仿真方法，确定了结构初始刚度、初始破坏载荷、极限破坏载荷的仿真判别方法，使得SHELL91“三明治”壳单元对船用泡沫夹层复合材料结构可用。文中详细说明了船用泡沫夹层复合材料梁、板等基本结构的弯曲试验，对等效仿真方法进行验证，等效仿真得到的结构初始刚度、初始破坏载荷、极限破坏载荷等与试验结果吻合。在前人确定的数值试验方法基础上，展开一系列数值试验，并与等效仿真进行对比，结果吻合较好，具有较强的实用性与推广性。初步认为此方法可应用于大型泡沫夹层复合材料船舶与海洋结构物的仿真计算，在保证精度的基础上大大减小了计算量，对整体结构的强度衡准、刚度校核等计算工作具有较强说服力。更多还原

【Abstract】 In recent years, composite with high specific strength and stiffness, especiallyconstituted by FRP face and light material sandwich structure, refreshed the classicalstandard shipbuilding industry, and caused great changes in the ship design and production.But because of the lag of development of composite manufacturing industry in our country,compared with international standard, our construction design and manufacture ofcomposite hull structures have a large backward. Just in recent years, the finite elementsimulation of composite hull structures analysis of our country began to develop. Andespecially there are few technical papers published for the finite element analysis of foamsandwich composite technology, thus seriously affecting the development of foam sandwichcomposite hull industry. Therefore, the numerical simulation of foam sandwich compositehull structure analysis and calculation research is necessary enough.Departure from the classical laminated plate theory, briefly introduced the commonsandwich structure design methods and experience. In the preliminary work, this paperestablished one simulation based on the choice of ANSYS simulation platform andSHELL91sandwich elements. Face to the special nature of marine foam sandwichcomposite structures, this paper established such an equivalent parameters translationsystem that based on classical sandwich structure design method, and formed equivalentsimulation method and discriminating method to the initial stiffness of the structure, theinitial&ultimate failure load.This paper in detail described the marine foam sandwich composite beams and platesbending tests, to verify the equivalent simulation method. The test results showed that theinitial stiffness of structure and the initial&ultimate failure load from equivalentsimulation are consistent.Based on the previous work about numerical test methods, this paper launched aseries of numerical tests, and compared them with the equivalent simulation resultsconsistently. The work is proved practical and propagable. This paper preliminary viewsthat this method can be applied to the simulation of large foam sandwich composite shipand marine structures, and greatly reduces the amount of computation on the basis ofaccuracy guaranteeing, thus the calculation work about overall structure on strength andstiffness is quite persuasive.更多还原