1. 上海交通大学 船舶海洋与建筑工程学院， 上海 200240; 2. 上海交通大学 空间结构研究中心， 上海 200240; 3. 中国特种飞行器研究所， 湖北 荆门 448000
收稿日期:2019-06-20出版日期:2020-11-28发布日期:2020-12-04通讯作者:张大旭，男，副教授，博士生导师，电话（Tel.）：021-34207985；E-mail: daxu.zhang@sjtu.edu.cn.作者简介:张云浩（1990-），男，河南省信阳市人，硕士生，主要研究方向为膜材透气性能.基金资助:国家自然科学基金项目（U1831105, 11272207，51278299），民机科研项目（MJ-2015-F-036）Effects of Short-Term Aging and Creasing Damage on Air Leakage Properties of Airship Envelope Materials
ZHANG Yunhao1,Alimu·Anwaier1,MI Xiang1,ZHANG Daxu1,CHEN Wujun2,LU Guofu3,ZHANG Jinkui31. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Space Structures Research Centre, Shanghai Jiao Tong University, Shanghai 200240, China; 3. Special Aircraft Research Institute, Jingmen 448000, Hubei, China
Received:2019-06-20Online:2020-11-28Published:2020-12-04摘要/Abstract
摘要： 飞艇囊体材料老化与折皱损伤会影响其空气泄漏性能，是决定飞艇单次飞行时长的关键因素.本文以高阻隔性能囊体材料Uretek3216-LV为研究对象，完成了5种老化时长(0月、1月、3月、8月及12月)条件下4种折皱损伤程度(全揉搓20次、270次、900次及 2700 次)的揉搓试验，并对揉搓后材料材料展开了空气泄漏试验.利用最小二乘法及残差平方和原理进行了数据分析，得出压强差、揉搓次数及两者与泄漏率的关系曲线和拟合曲面，分析了老化及折皱损伤对材料泄漏率的影响程度.利用扫描电子显微镜观察材料损伤衍变过程并分析其破坏机理.结果表明：短期老化损伤对囊体材料泄漏性能几乎没有影响，折皱损伤会严重影响囊体材料的泄漏性能.泄漏率与压强差呈正相关，泄漏率与揉搓次数关系曲线由初始段的非线性正相关关系转变为线性关系.揉搓破坏过程经历3个阶段：纱线扭曲松散阶段、功能层破坏阶段及纱线纤维丝断裂产生针孔阶段.本研究结果可为飞艇囊体结构分析与设计提供参考.
关键词: 飞艇囊体材料；空气泄漏率；自然老化；折皱损伤；压强差
Abstract: Aging and creasing damage of the airship envelope materials would affect the air leakage, which is a key factor in determining the duration of a single flight of an airship. In this paper, Uretek3216-LV, a high barrier property envelope material, was used to conduct a flexural durability test across five different aging timelines (0,1, 3, 8, 12 months) under four different flex conditions (20,270,900,2700 cycles) with an air leakage test in all samples. The data was analyzed using the least square method and the principle of the residual sum of squares. The relationship curves and fitted surfaces between the pressure difference, the number of rubbing times, as well as the above two factors and the air leakage rate were obtained. The influence degree of aging and creasing damage on the air leakage rate of the material was analyzed. The deformation process of the material damage was observed by scanning the material with an electron microscope and the failure mechanism was analyzed. The results show that the short-term aging damage has little effect on the air leakage properties of the envelope materials but the creasing damage will seriously affect the air leakage properties. The air leakage is proportional to the pressure difference, and the relationship between the air leakage rate and the number of flex cycles is changed from the nonlinear positive correlation of the initial segment to the linear relationship. The failure process undergoes three stages, which are the stage of loosening and twisting of fiber, the stage of functional layer failure, and the stage of fiber breakage leading to formation of pin hole. The results obtained can provide reference for the analysis and design of the airship envelope structure.
Key words: airship envelope materials; air leakage rate; natural aging; creasing damage; pressure difference
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