高性能纤维防弹材料的基本种类、结构及其防弹性能

简述了高性能纤维的基本分类及高性能防弹纤维材料的防弹机理,并对比分析了碳纤维、芳纶、超高分子量聚乙烯纤维（UHMWPE）、玻璃纤维等几种纤维的基本结构、防弹性能及其在防弹领域的应用。     

高性能纤维的结构及其在防弹领域的应用

简述了以高性能纤维作为防弹材料的防弹机理,主要分析了几种纤维的结构及其防弹性能,并在此基础上分析了PBO纤维以及生物纤维蜘蛛丝应用于防弹领域的可行性。     

剪切增稠液/纤维复合材料防弹性能的研究进展

为促进对剪切增稠液(STF)与高性能纤维复合形成具有高效力学响应和能量吸收机制的智能抗冲击防护材料的性能研究和应用,综述了STF流变性能、STF/纤维复合材料力学性能及其抗弹道冲击机制的研究进展,分析了STF原料选择、复合材料体系构建原理及制备方法.针对STF/纤维复合材料的弹道冲击过程和特点及其在高速冲击下的反应机制...     

纤维增强防弹复合材料的应用及研究现状

当今,各种防弹材料不仅要达到安全的要求,还需进一步满足轻质、舒适的要求,因此高性能纤维增强复合材料成为研究防弹材料的重点。文章分析了碳纤维、芳纶纤维、超高分子量聚乙烯纤维、PBO纤维和多种混杂纤维复合材料的优势与不足及其在防弹材料领域的应用,阐述了纤维复合材料的防弹机理及基体和界面性能对防弹性能的影响,面对将来防弹材料多方面的高性能要求,展望了纤维复合材料在防弹材料领域的优化方向,即优化纤维和基体的力学性能、优化界面粘接性能、优化设计混杂纤维复合材料。     

防弹层压复合材料防弹性能的实验研究

探讨防弹层压复合材料中树脂含量与靶板弹道性能的关系和织物与树脂合理的复合方式 ,结论是芳纶防弹层压复合材料的弹道极限主要取决于靶板所含的织物层数 ,与树脂含量关系不大     

高性能防弹纺织材料

近年来,防弹纺织品一直朝着轻质和高性能的方向发展,在为作战人员和警务人员提供更好保护的同时,也更兼顾舒适性和易打理性.美国国家司法学会(NU)已更新了其防弹装甲产品的认证标准,新标准对参数的要求更为严格,特别是防弹功能的耐久性部分.     

复合材料防弹头盔的研究进展

介绍了防弹头盔的发展概况及其防弹机制。从防弹头盔复合材料用高性能纤维种类、树脂基体类型、预制件结构,以及防弹头盔的成型工艺和防弹标准等方面,对现有研究进行总结和展望。研究为高性能防弹头盔的研发提供参考。     

纤维增强复合材料防弹头盔壳体的设计研究

防弹头盔作为头部防护的重要设施,在战争环境中,头部中枢神经是战斗人员的安全基础,可见防弹头盔设施研发的重要性。基于此,文章根据纤维增强复合材料的防护原理,从材料、纤维增强组织、制作工艺三部分入手,对纤维增强复合材料防弹头盔壳体的设计制造进行研究。     

高性能纤维性能分析

分析了碳纤维、超高强聚乙烯纤维、芳香族聚酰胺纤维、聚对苯撑苯并双噁唑(PBO)纤维和M5纤维等高性能纤维的重要特性以及它们的应用状况。     

新型防弹复合材料

随着先进技术在军事战争中的应用,人员财产损失的情况越来越复杂,因此对防弹材料也应深入研究与应用,陶瓷装甲与纤维增强复合材料是重要研究应用方向.对新型复合防弹陶瓷板和芳纶防弹复合材料进行概述,对比新型复合防弹陶瓷板与传统防弹板,分析其特点与当前研究应用中仍存在的一些问题;对芳纶防弹复合材料的防弹机理进行详细描述,指出影响...     

高性能纤维复合材料在簇绒织机上的应用

簇绒织机常用于地毯生产，新一代的高性能簇绒织机最高转速可达1800r／min。在选用中等机速，连续生产的情况下，生产速度为270m／h。如果织机幅宽为5m，那么产量为1350m^2／h。但实际上，大多数织机都以相对较低的速度运转。造成织机低速运转的因素很多，其中主要原因是，当织机达到一定速度后，簇绒针和成圈钩之间的绒头纱线传感器就会处于非正常工作状态，使地毯表面不匀，产品质量下降。     

The long-term performance of cementitious composites reinforced with coir fibre

Effective prediction of the long-term performance of natural fibre-reinforced cementitious materials is vital for their application. In this study, coir fibres of two different average lengths were combined with cementitious materials and chemical agents to form coir fibre-reinforced cementitious composites (CFRCCs). The composites long-term performance was assessed and compared with two different accelerated ageing processes, i.e. a cement-saturated water ageing, and alternate freeze–thaw ageing. The flexural properties were compared with the properties of the reference mortar. Overall, the flexural strength of 400 days naturally aged CFRCC specimens was weaker than that of the reference mortar. The toughness and ductility of the fibre-reinforced specimens, however, improved. The cement-saturated water ageing method gave a precise prediction of the flexural strength development of 400-day-old specimens, and the freeze–thaw ageing method worked very well for the toughness performance estimation of CFRCCs.     

Processing of waste carbon and polyamide fibres for high-performance thermoplastic composites: influence of carding parameters on fibre orientation,fibre length and sliver cohesion force

Abstract

The processing of waste carbon fibre on carding machine for the developments of nonwovens, tapes and hybrid yarn structures is an emerging trend. These structures are widely used to enhance the performance efficiency of recycled carbon fibre reinforced thermoplastic composites. The aim of the research presented in this study is to process waste carbon fibre on a carding machine and to investigate the influence of different carding parameters on waste carbon fibre. For this purpose, card slivers composed of waste carbon and polyamide fibres were developed on a double cylinder card machine by varying technical parameters. Then, effect of these parameters on card sliver quality was assessed in terms of fibre orientation, fibre length and sliver cohesion force. Results revealed that fibre orientation and fibre length is significantly affected by technological parameters carding zones, whereas the sliver cohesion force is significantly affected by the speed of feed roller and doffer.     

Microfoaming of flax and wood fibre reinforced polypropylene composites

Natural and wood fibre reinforced plastics as a relatively new group of environmental friendly materials have been extensively applied in interior, building applications and in the automobile industry. Among others, natural and wood fibre reinforced foamed polymer materials are of high significance because of the possibility of their reducing the density of automotive components which have a cellular structure. However, the properties of these materials have not been fully investigated and described. Microcellular composites of polypropylene containing natural and wood fibre was prepared using an injection moulding process. In the present work, the manufacturing technology of natural and wood fibre reinforced polymer microfoams was developed and the influence of fibre and microvoid content on its property spectrum was systematically investigated. The forming of microvoids and the degree of foaming related to the variation of the processing parameters in connection with manufacture technology was characterised. Measurement of density, cell size, tensile and flexural properties of the prepared composites was carried out. The cell structure is dependent on flow direction of foaming. The density of microfoamed wood fibre-PP composites was reduced by about 24% and decreased by as much as 0.77 g/cm³.Light microscopy showed that the cells are circular and it was also observed that the maximum cell sizes are between 10–50 μm. Water absorption and scanning electron microscopy of the composites were also investigated. Considering the experimental results, it can be deduced that the microcellular composites exhibit a possible combination of relatively good engineering properties and lower density for different technical applications.     

对聚乙烯醇纤维改性改善成纸性能的研究

该文通过对聚乙烯醇(PVA)纤维改性改善成纸的性能作了研究。对针叶木浆以及瓦楞原纸浆中加入PVA纤维混合抄纸,对纸张物理性能的检测结果表明:加入PVA纤维后,纸样的撕裂度、裂断长及环压指数均有明显的提高。水溶性PVA纤维可作为纸张增强剂及花色纤维应用于纸浆纤维中,成纸有较好的强度,挺度及均匀性,可用于防伪、高档包装等用途。     

阻燃型废弃麻纤维/聚乳酸复合材料的性能分析

以聚乳酸颗粒为基体材料,以废弃麻纤维为增强材料,采用双辊混炼法和热压成型法,制备阻燃型废弃麻纤维/聚乳酸复合材料,并研究其力学性能和阻燃性能,优化其热压工艺参数。以拉伸强度、弯曲强度、冲击强度、极限氧指数为检测指标,以聚乳酸质量分数、阻燃剂质量分数、热压压力、热压温度为因素,通过正交试验和极差分析,优化出最优成型工艺条件,即聚乳酸质量分数为60%,阻燃剂质量分数为30%,热压压力为10 Mpa,热压温度为180℃。为进一步开发阻燃型废弃麻纤维复合材料提供理论基础。     

Impact performance of two bamboo-based laminated composites

The present work aims to determine the impact performance of two bamboo-based laminated composites [bamboo/poplar laminated composite (BPLC) and bamboo/glass fiber laminated composite (BGFLC)] using low-velocity impact tests by a drop tower. In addition, fracture characteristics were evaluated using computed tomography (CT). Results showed that BPLC presented better impact properties in both directions than BGFLC. Three stages are noted in impact load–deflection curves. The load–deflection curve characteristics of two composites are different in different stages. Matrix cracking, fiber-matrix interface debonding and delamination, and fiber breakage are the three main fracture mechanisms of two composites. Structural characteristics of the components and bonding strength are the important factors for impact properties and fracture mechanism of both bamboo-based laminated composites.     

间隔织物基光热-热电复合材料的制备及其性能

为提高柔性可穿戴供能设备的热电性能,首先利用NaOH和二甲亚砜(DMSO)共同掺杂聚(3,4-乙烯二氧噻吩)-聚苯乙烯磺酸(PEDOT:PSS)制备NaOH/DMSO/PEDOT:PSS热电膜,研究了NaOH及DMSO质量分数对PEDOT:PSS电导率、塞贝克系数以及功率因数的影响;然后以棉/涤纶间隔织物为基材,通过复合NaOH/DMSO/PEDOT:PSS并涂覆ZrC/聚氨酯(PU)光热层制备光热-热电复合材料,并对复合材料的形貌结构和热电性能等进行表征。结果表明:当添加质量分数为0.5%的NaOH及3.5%的DMSO时,NaOH/DMSO/PEDOT:PSS热电膜的功率因数达到最高,为25.6 μW/(m·K²),是纯PEDOT:PSS膜的2 327倍;光热-热电复合材料的塞贝克系数为35.5 μV/K,添加ZrC/PU光热层后复合材料在光照下产生的电压为无光热层复合材料的6.3倍。     

T型壁板RFI缝合复合材料的屈曲性能

在实验研究BS3-94-10型环氧树脂膜流变学性能、叠层预制件厚度方向压实性能、RFI缝合随炉试件层间剪切和弯曲性能的基础上,优化设计了树脂膜融渗及缝合工艺参数,并制备了高性能T型壁板RFI复合材料制件。缝合前后T型壁板屈曲性能测试结果表明,缝合可显著提高T型壁板的屈曲性能。     

新型腈纶制条设备的技术性能

随着化纤工业的发展 ,化纤丝束采用直接制条纺纱技术已在国际上广泛使用。这是由于化学纤维原料的本身已具有良好的平行排列、洁净及少杂质的特点。根据工艺技术区分 ,腈纶长丝直接制条一般采用拉断法制成毛条的方式 ,涤纶长丝直接制条采用切断法制成毛条的方式。腈纶制条工业在我国 2 0世纪 70年代已工业化生产 ,当时甘肃省兰州化纤腈纶厂从日本引进“托波”直接制条牵切设备 ;2 0世纪 80年代上海石化腈纶厂从德国“赛特尔”公司引进 6 77型多区拉断直接制条机 ,国内有关纺机厂开始研制ＢＲ2 11型制条机 ,并通过消化吸收国外的先进技术研制…