The Migration of Stress Concentrations in Integrated Composite Structures.
集成复合材料结构中应力集中的迁移。
基本信息
- 批准号:1789271
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:英国
- 项目类别:Studentship
- 财政年份:2016
- 资助国家:英国
- 起止时间:2016 至 无数据
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Constant demand from the aerospace industry to reduce weight, and to increase both component performance and the manufacturing rates of composite structural parts has led to interest in the use of discrete stiffness tailoring (DST), in order to realise these targets. Traditionally, the fibre angle within a single ply layer is constantly orientated in a single direction, and it is the stacking sequence of plies that is optimised for the required stiffness and strength. Discrete stiffness tailoring however, seeks to alter the fibre angle and thickness across the geometry of a part in a discontinuous fashion. A previous ESPRC sponsored project found that a maximum weight saving of 40% was achievable if both the ply angle and thickness were simultaneously optimised for composite structures. This optimisation could be achieved with a minimum of three discrete strips or zones across the width of a flat panel, where the orientation of the fibre is constant but different within each strip. DST laminate structures can theoretically be manufactured using Automated Tape Laying (ATL) machines, which are able to deposit material at a high-rate when compared to other manufacturing methods. This technology, combined with the use of discrete bi-axial composite tapes (i.e. Non Crimp Fabrics) has in theory the twofold advantage of increasing the deposition rate by as much as eight times currently achieved, and creating structures with a 40% improvement in performance.However, structures created using the DST technique may be critically affected in terms of strength due to the vulnerability of the joints between the adjacent strips. The stress concentrations developed as a result of the stiffness changes between strips, the joint itself, and any possible taper introduced as a result of the optimisation have not yet been investigated fully. The aim of this project is to initially characterise the stress concentrations between the fibre strips, and then to investigate the role of taper on stress transfer, and to be able to define this analytically. The final objective is to develop design strategies for strip deposition taking into account minimising the manufacturing time, material wastage etc. and optimising the component strength. These aims will be met through a combination of experimentation and analytical work.This PhD is part of the ADAPT ESPRC sponsored project, the overall aim of which is to produce a fourfold increase in the deposition of stiffness tailored material, in order to meet demand for new short-range aircraft in the next 20 years, as well as improving component performance. The ESPRC have identified Manufacturing the Future as a key theme for current research; a focus for which this project is highly relevant, in terms of aiming to develop current production processes. The project is supported by an industrial partner, GKN; and also will incorporate some involvement from Chomarat (thin-ply manufacturer) and Airbus.
航空航天工业对减轻重量、提高部件性能和复合材料结构部件的制造速率的不断需求,导致人们对使用离散刚度剪裁(DST)的兴趣,以实现这些目标。传统上,在单个层片层内的纤维角恒定地在单个方向上取向,并且针对所需的刚度和强度优化的是层片的堆叠顺序。然而,离散刚度剪裁试图以不连续的方式改变部件几何形状上的纤维角度和厚度。ESPRC之前赞助的一个项目发现,如果同时优化复合材料结构的铺层角度和厚度,最大重量可节省40%。这种优化可以通过在平板的宽度上最少三个离散的条带或区域来实现,其中纤维的取向是恒定的,但在每个条带内不同。DST层压结构理论上可以使用自动铺带(ATL)机器制造,与其他制造方法相比,自动铺带(ATL)机器能够以高速率存款材料。这项技术,结合使用离散双轴复合磁带(即非卷曲织物)在理论上具有双重优势,即将沉积速率提高多达目前实现的八倍,并且产生性能提高40%的结构。使用DST技术建造的结构,由于相邻结构之间的连接处的脆弱性,脱衣舞由于条带之间的刚度变化、接头本身以及由于优化而引入的任何可能的锥度而产生的应力集中尚未得到充分研究。本项目的目的是初步研究纤维条之间的应力集中,然后研究锥度对应力传递的作用,并能够分析地定义这一点。最终的目标是制定带材沉积的设计策略,同时考虑到最大限度地减少制造时间,材料浪费等,并优化部件强度。这些目标将通过实验和分析工作的结合来实现。该博士学位是ADAPT ESPRC赞助项目的一部分,该项目的总体目标是将定制材料的刚度沉积增加四倍,以满足未来20年对新型短程飞机的需求,并提高部件性能。ESPRC已将“制造未来”确定为当前研究的一个关键主题;就旨在开发当前生产工艺而言,该项目与此高度相关。该项目得到了工业合作伙伴GKN的支持,并将包括Chomarat(薄板制造商)和空中客车的部分参与。
项目成果
期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Buckling and strength analysis of panels with discrete stiffness tailoring
具有离散刚度剪裁的面板的屈曲和强度分析
- DOI:10.1016/j.compstruct.2019.111672
- 发表时间:2020
- 期刊:
- 影响因子:6.3
- 作者:Culliford L
- 通讯作者:Culliford L
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其他文献
吉治仁志 他: "トランスジェニックマウスによるTIMP-1の線維化促進機序"最新医学. 55. 1781-1787 (2000)
Hitoshi Yoshiji 等:“转基因小鼠中 TIMP-1 的促纤维化机制”现代医学 55. 1781-1787 (2000)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
LiDAR Implementations for Autonomous Vehicle Applications
- DOI:
- 发表时间:
2021 - 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
吉治仁志 他: "イラスト医学&サイエンスシリーズ血管の分子医学"羊土社(渋谷正史編). 125 (2000)
Hitoshi Yoshiji 等人:“血管医学与科学系列分子医学图解”Yodosha(涉谷正志编辑)125(2000)。
- DOI:
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- 影响因子:0
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Effect of manidipine hydrochloride,a calcium antagonist,on isoproterenol-induced left ventricular hypertrophy: "Yoshiyama,M.,Takeuchi,K.,Kim,S.,Hanatani,A.,Omura,T.,Toda,I.,Akioka,K.,Teragaki,M.,Iwao,H.and Yoshikawa,J." Jpn Circ J. 62(1). 47-52 (1998)
钙拮抗剂盐酸马尼地平对异丙肾上腺素引起的左心室肥厚的影响:“Yoshiyama,M.,Takeuchi,K.,Kim,S.,Hanatani,A.,Omura,T.,Toda,I.,Akioka,
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- 影响因子:0
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