Simulating Resin Infusion through Textile Reinforcement Materials for the Manufacture of Complex Composite Structures

商用飞机对减轻机身重量和提高燃料效率的需求日益增强,这一需求促进了复合材料在商用飞机结构中的应用。当飞机的复合材料结构变得更庞大、更复杂时,传统的热压罐生产方法就会变得相当昂贵,这一现象引起了研究者对非热压罐成型技术的关注。在此技术中,树脂被注入强化预浸料层。然而,树脂灌注工艺与操作人员的技术和经验息息相关,特别是在开发复杂部件的生产策略时。作为一种用于预测的计算工具,流程建模旨在解决可靠性问题以及传统反复试验法所导致的浪费问题。大多数传统建模仍应用于工业,主要针对各向同性多孔强化材料的流体流动模拟。然而,最近的一些研究开始将编织材料的多尺度和多学科的复杂性纳入考虑范畴,其模拟方法可以提供更高的保真度。尤其考虑到具有渗透性和多孔性的强化材料导致的织物变形效应,新的多物理场流程模拟能够通过织物更好地预测树脂的灌注行为。除了综述与流程模拟相关的前人研究和工艺现状,本文还重点论述了最近关于复杂双圆顶组件的多物理场流程模拟与实验灌注的对比验证。通过考虑变形依赖的流动行为,多物理场流程模拟能够预测实际的流动行为,证明其与基础的各向同性渗透模型相比有很大程度的改进。

Preparation of Composite Phase Change Material Based on Sol-Gel Method and Its Temperature-Adjustable Textile

In this study,the sol-gel method was introduced to prepare the composite phase change material (CPCM). The CPCM was added to fabric with coating techniques and the thermal activity of modified fabric was studied. In addition,the thermal property and the microstructure of CPCM were also discussed in detail by means of polarization microscope and differential scanning calorimeter,respectively. According to the analysis of main influencial factors of the property of CPCM,the optimal preparing technique was determined. It was proved that CPCM could exhibit a good thermal property while phase transformation process took place,and a better appearance of the fabric modified with CPCM could be obtained due to the fact that in a warm circumstance,the liquid-state phase change material could be firmly enwrapped and embedded in the three-dimensional network all the time during the phase transformation. Besides,the fabric treated with CPCM had a high phase-transition enthalpy and an appropriate phase-transition temperature. As a result,a desirable temperature-adjustable function appeared.

Application of the Zisman Critical Surface Tension Technique to Textile Materials Using Contact Angle Measurements

This is the first one that applies the Zisman critical surface tension technique successfully to textile materials. It was accomplished by carefully determination of the contact angle of fabric. The deviation caused by the porous structure of the fabric will be taken into account. To do so, a Jens equation is applied, and the measured contact angles can be corrected. The surface porosity was determined by measurement and approximate calculation, and the chemical composition of the surface was characterized by means of attenuated total reflection Fourier-transform infrared(FTIR/ATR).

Demand Elasticity for China's Major Imported Agriculture Textile Material Based on Restricted Version of Source Differentiated Almost Ideal Demand System Model

By comparing China's import of major imported agriculture textile material( cotton and wool),the characteristics of import are concluded. On this basis,a restricted version of source differentiated almost ideal demand system( RSDAIDS) is used to estimate the income and price elasticity of major imported agriculture textile material from the major sources based on the data from 1992 to 2015. The results are shown as follows.( 1) Although the dependency on imported cotton is lower than wool, the fluctuation of cotton import is much more drastic; China's demand for cotton is relatively price elastic with higher expenditure elasticity compared with wool; besides,the existence of complementarity is proved between imported cotton and wool.( 2) According to the import elasticity of cotton,demand for cotton imported from India shows priority over cotton from other sources; demand for cotton imported from America is the most price-sensitive one; substitution among cotton from different sources is weak.( 3) According to the import elasticity of wool,wool imported from Uruguay has bright market prospects. In addition,wool imported from Australia has irreplaceable advantage than that from New Zealand.

Vibration of Three-Layered FGM Cylindrical Shells with Middle Layer of Isotropic Material for Various Boundary Conditions

In the present study, vibration analysis of a three-layered cylindrical shell is performed whose inner and outer layers are composed of functionally graded materials whereas the middle one is assumed to be of isotropic material. This formation of a cylindrical shell influences stiffness modulii and the resultant material properties. The shell problem is formulated from the constitutive relations of stresses and strains with the displacement deformations and they are taken from Love’s thin shell theory. This problem is transformed into the integral form by evaluating the expressions for the strain and kinetic energies of the shell. Rayleigh-Ritz method is employed to solve the shell dynamic equations. Vibration characteristics of these cylindrical shells are investigated for a number of physical parameters and configurations of the fabrication of shells. The axial modal dependence is approximated by the characteristic beam functions that satisfy the boundary conditions. Results evaluated, show good agreement with the open literature.

Investigation of Atmospheric Plasma Discharge and Its Application to Surface Modification of Textile Materials

In this paper, an improved quasi-stable atmospheric pressure dielectric barrier discharge (DBD) plasma source is achieved after carefully controlled discharge voltage and current, discharge power, working gas, treatment period, and gap between the electrodes. This plasma source has been used to modify the surface of Polybutylene Terephthalate (PBT) melt-blown nonwovens and Polyester (PET) fabrics, and the various influences on surface modification and the aging effect of treated polymeric materials have been systematically investigated. In addition, the method of spectrum analysis is also used for diagnosing plasma parameters such as electron temperature. Experimental results indicate that both the wettablity and permeation of treated PBT melt-blown nonwovens and dyeing ability of treated PET fabrics are certainly improved.

Innovation Union of New Textile Materials coming into shape The 13th(Hangzhou) Tanboocel Union Conference held in Xiaoshan

January 10th-12th marked the opening of The13th(Hangzhou)Tanboocel Union Conference themed on"Green,Innovation,Intelligent and Win-win".Directed by China National Textile and Apparel Council(CNTAC)and sponsored by China Tanboocel Union,the conference was hosted by Jilin Chemical

Textile electronics for wearable applications

Textile electronics have become an indispensable part of wearable applications because of their large flexibility,light-weight,comfort and electronic functionality upon the merge of textiles and microelectronics.As a result,the fabrication of functional fibrous materials and the integration of textile electronic devices have attracted increasing interest in the wearable electronic community.Challenges are encountered in the development of textile electronics in a way that is electrically reliable and durable,without compromising on the deformability and comfort of a garment,including processing multiple materials with great mismatches in mechanical,thermal,and electrical properties and assembling various structures with the disparity in dimensional scales and surface roughness.Equal challenges lie in high-quality and cost-effective processes facilitated by high-level digital technology enabled design and manufacturing methods.This work reviews the manufacturing of textile-shaped electronics via the processing of functional fibrous materials from the perspective of hierarchical architectures,and discusses the heterogeneous integration of microelectronics into normal textiles upon the fabric circuit board and adapted electrical connections,broadly covering both conventional and advanced textile electronic production processes.We summarize the applications and obstacles of textile electronics explored so far in sensors,actuators,thermal management,energy fields,and displays.Finally,the main conclusions and outlook are provided while the remaining challenges of the fabrication and application of textile electronics are emphasized.

Investigation and Comparison of 2.4 GHz Wearable Antennas on Three Textile Substrates and Its Performance Characteristics

In this paper, two different methods were used for investigating the RF characteristics of three types of textile materials. Goch, Jeans and Leather substrates were studied. A microstrip ring resonator method and DAK (Dielectric Assessment Kit) method were used. Bluetooth antennas were designed and fabricated using these substrates. The results were compared for the two methods. The bending effect of these antennas on its impedance characteristics due to human body movements was also studied. Finally, all antennas were simulated by CST simulator version 2016, fabricated using folded cupper and measured by Agilent 8719ES VNA. The measured results agree well with the simulated results.

Towards Reliability-Enhanced Mechanical Characterization of Non-Crimp Fabrics: How to Compare Two Force-Displacement Curves against a Null Material Hypothesis

Detailed characterization of fabric reinforcements is necessary to ensure the quality of manufactured composite parts, and subsequently to prevent structural failure during service. A lack of consensus and standardization exists in selecting test methods for the mechanical characterization of fabrics. Moreover, in reality, during any experimentation there are sources of uncertainties which may result in inconsistencies in the interpretation of data and the comparison of different testing methods. The aim of this article is to show how simple statistical data analysis methods may be used to enhance the characterization of composite fabrics under individual and combined loading modes while accounting for inherent material/test uncertainties. Results using a typical glass non-crimp fabric (NCF) show that, statistically, there are significant differences between the warp and weft direction responses of a presumably balanced NCF under all deformation modes, with weft yarns being generally stiffer. Moreover, the statistical significance of warp-weft couplings under both simultaneous and sequential biaxial-shear loading modes became statistically evident, when compared to a pure biaxial deformation.

银纳米线导电纺织品制备及应用研究进展

银纳米线具有优异的长径比、导电、透光、柔性、抗菌等特性,是制备导电纺织品最有前途的纳米材料之一。介绍银纳米线导电纺织品的常用制备方法,即共混纺丝法、后整理法,综述银纳米线导电纺织品在空气过滤、饮用水过滤、电磁屏蔽、个人热管理、柔性压力传感器等领域的应用进展。最后对银纳米线导电纺织品的未来发展趋势进行展望,为下一代智能纺织品的研发提供思路。

光催化技术在纺织领域的研究及应用进展

太阳能光催化技术因环保、低成本的特点备受研究者青睐,将光催化技术应用于纺织领域的研究已取得一定的成果。半导体光催化剂在光辐照下吸收光子能量并激发出具有强氧化还原能力的活性自由基,以此分解有机污染物。综述光催化材料的常用载体以及其在纺织品上的负载方法,归纳其赋予纺织品的特殊功能。研究表明,光催化材料处理纺织印染废水具有很好的应用前景;经过光催化剂整理的织物可获得自清洁、抗菌以及防紫外线的功能,减少纺织品的洗涤次数,有效保护人体皮肤健康;将光催化剂负载于纤维或织物上有效提升其可回收利用性。

纺织科技发展前沿

随着科学技术的创新和进步,纺织行业不断迭代升级。前沿技术的跨界与融合,在理论、应用领域不断推动纺织科技取得重大进步与突破。通过介绍先进技术在纺织纤维材料、纺织智能制造、纺织绿色加工和先进纺织品领域的应用,综述了纺织行业从纤维到制造,再到后道加工和应用的全流程研究进展,总结了纺织纤维先进制备技术、计算机数字化技术在纺织制造领域的应用,和以环保为核心的纺织绿色加工技术、高科技纺织品在各大产业的应用。随着科技的进一步革新以及对绿色纺织品的更高要求,以高效化、数字化、智能化、绿色化为导向的多元发展仍是纺织技术革命的方向。

织物基金属有机框架复合材料的制备及应用研究进展

金属有机框架(metal-organic frameworks,MOFs)材料作为第三代多孔材料,因其高比表面积、高稳定性、化学可调性等功能特性而备受关注,尤其在各种轻质和柔性基材上负载应用成为该领域的热点研究方向。本文综述了纺织基材作为载体,负载MOFs的进展,对以溶剂热法、逐层生长法、喷涂打印法等构建织物基MOFs复合材料的方式进行阐述,且根据制备方式的差异性指出不同制备方式的应用场景;归纳了该类材料的复合机理;针对复合材料的使用耐久性总结了现有增强MOFs与基底材料结合牢固性的方法,并介绍了该类复合材料在超疏水自清洁、自消毒纺织品等领域应用的最新研究成果。最后指出织物基MOFs复合材料的大规模生产方式以及在现实环境条件下的耐久性是迈向广泛应用的关键步骤,其更多的一体化功能是未来研究的重点方向。

基于纺织材料的人造血管制备及应用进展

为了制备具有良好顺应性、安全性能高的纺织人造血管,从人造血管的研究背景、研究价值和发展历程出发,阐述了涤纶(PET)、聚氨酯(PU)、聚四氟乙烯(PTFE)和丝素蛋白(SF)等几种用于人造血管的主要材料的特点,阐述了机织、针织、编织、非织造及3D打印制备人造血管主要方法的特点、适用范围及最新研究进展,归纳了在人造血管领域目前现存的问题,最后对未来纺织材料在人造血管中的应用研究趋势进行了展望,以期为开发理想的人造血管提供一定的参考。

智能纺织材料散热性能及其散热测试方法研究进展

智能纺织品在可穿戴设备、建筑、能源和产品设计等方面有着广泛市场应用,近年来得到发展迅速。电子纺织品的电子电路包括嵌入在纱线中的发光二极管、传感器和电池等设备。当温度超过一定的阈值时,温度会造成产生严重的问题,为了减少温度的负面影响,提高嵌入式设备的可持续性,介绍了天然面料的散热性能、散热合成面料的研究以及导热性的测试方法,并且对智能纺织品的温度监测进行了研究。

凝胶复合材料柔性可穿戴传感器研究

水凝胶和离子凝胶具有高可拉伸性和优异透明度,是一种理想柔性传感器制备原料,与导电材料复合后导电性能大大提高。凝胶复合材料具有较强形状可塑性,可通过改变表面微结构提高传感器件灵敏度。综述水凝胶和离子凝胶及复合材料研究现状,列举其在柔性可穿戴力学传感器、电化学生物传感器及温、湿度传感器等方面的应用,为后续在柔性通信设备、生物医疗监护等领域的应用提供参考。

纺织基柔性防刺材料的研究进展

防刺服是人体抵御刀具等尖锐器具袭击的防护装备。我国GA 68—2019《警用防刺服》标准要求防刺服具备防刺、穿戴柔性与轻便等特点。文章介绍了以柔性织物为基础的4类防刺材料即纯织物结构防刺材料、织物表面涂覆硬质粒子防刺材料、织物-剪切增稠液复合结构防刺材料、织物树脂复合结构防刺材料的研究现状,并总结出:纺织基柔性防刺材料在兼顾材料防刺性能、轻质与柔性方面尚存在一定的问题。纯织物结构的防刺材料厚度太大,涂覆硬质粒子增加了防刺材料的克重,添加剪切增稠液影响了防刺材料的透气舒适性,复合树脂在树脂材料、形态尺寸及其空隙率等方面对防刺材料的影响有待进一步研究。