Characterization and analysis of in-plane shear behavior for glass warp knitted non-crimp fabrics based on bias extension experiment

Abstract

In this article, the in-plane shear rigidity modulus of five commercially available fabrics of glass warp knitted non-crimp fabrics (WKNCFs) was experimentally investigated by uniaxial bias extension test (UBE). The aim was to characterize and compare the shear behavior of relatively high areal density fabrics, while these fabrics could have good potential to be widely used in the composites field. In this work, five fabrics were included: a uni-directional, 2 bi-axial, and 2 tri-axial fabrics. To characterize the shear properties, stress equations were established to deliver the in-plane modulus of shear rigidity as a function to shear angle. The fabric structure of uni-axial or multi-axial had a different influence on the shear resistance mechanics along with the influence of the stitching pattern; both were also presented in the comparison of deformation mechanisms. It was found that the shear behavior of all five fabrics was dissimilar to each other.     

Geometrical analysis of co‐woven knitted preform for composite reinforcement

In this paper, a co‐woven knitted (CWK) structure for composite reinforcement is presented. Based on the experimental observations, its unit cell and representative volume element (RVE) geometries were identified along with the idealized cross‐sectional shapes of the weft, warp and stitch yarns. A geometrical model for the RVE was proposed and the mathematical equations were derived to describe the relationships between the geometrical parameters and process variables. The model was verified with the experimental data and good agreements were obtained between the calculations and measurements of different yarn lengths in a RVE. The inserted and stitch fiber volume fractions as well as total fiber volume fraction were calculated and their variations with the stitch‐to‐inserted yarn linear density ratio under different fabric tightness factors were discussed. The geometrical model provides a basis for the establishment of process windows for the CWK preforms as well as for the prediction of the mechanical behavior of the CWK‐reinforced composites.     

车用纺织品的发展(二)

(上接本刊 2 0 0 2年第 6期第 1 8页 )3　汽车用功能性纺织品3 1　安全气囊资料表明一半以上的车祸造成的严重伤残和死亡事故是由正前方碰撞所致。采用安全气囊对防止死亡、减少某些伤残的确实效果 ,使不少国家立法规定将它作为汽车的安全器材。随着汽车工业的快速发展和高速公路的开发和建设 ,汽车的行驶速度提高很快 ,司乘人员对安全行驶的意识逐步加强 ,越来越多的出厂汽车装备了安全气囊 ,安全气囊已开始成为汽车的标准部件。安全气囊在美国已成为汽车的标准部件 ;日本本田公司将前座双安全气囊作为汽车的标准配置 ;英国还研制出最新型…     

Application of stitch-bonded multi‐plies made by using the extended warp knitting process: reinforcements with symmetrical layer arrangement for concrete

With the development of the extended stitch‐bonding process, an important modification of the production process for stitch‐bonded fabrics was realized. Through the introduction of a lateral shift of the needle bar, the stitch‐bonding process is essentially being changed compared with the working method used before. This has made possible the manufacturing of optimally adjusted textile semi‐finished products for numerous applications in the field of composite material. One such application – the usage of stitch‐bonded fabrics as a textile reinforcement for concrete – is analyzed in this article. It was observed that promising possibilities for the use of the extended stitch‐bonding process result from overcoming the known restrictions during the production with conventional stitch‐bonding machines. A markedly improved quality of textile reinforcement is achieved through the new binding patterns and the free arrangement of the layers. The reinforcement shows a verifiable better bonding behavior than the conventional method. Therefore, it is guaranteed that there is no spalling on the concrete surface at service load, which is an important prerequisite for the practical use of textile‐reinforced concrete.     

国产化纺织面料在汽车座椅中的应用

简述我国汽车座椅配套面料的应用现状和发展趋势。根据汽车座椅配套面料的生产经验,归纳国产化配套面料的要求及标准,指出汽车座椅面料开发的要点。     

粗粉碎纺织品高粘度涂层组分涂层用内置挤压辊式轧液机

织物增强混凝材料的承载性能由织物的增强基质和混凝基质的复合性能所决定。涂层组分对纱线横截面的完全渗透是复合材料最佳承载强度的先决条件。     

解析第三织物的产业化之路

介绍了第三织物的相关知识,分析了其在产业用纺织品领域内的发展前景。     

聚丙烯针织物在汽车装饰中的应用

简要综述了聚丙烯针织物的生产和它在汽车领域可能的应用.可以将聚丙烯纤维加工成满足汽车中需要的纺织品,所有加工聚丙烯织物的方法都可以采用,复合时可采用植绒或泡沫复合,制作汽车部件的方法可采用注模法、复合法及吹压法等.在未来纤维市场中,聚丙烯和聚乙烯将扮演非常重要的角色.     

从’96亚洲产业用纺织品展览会看经编产业用纺织品的发展

简介展览会概况,结合国内情况按经编轴向织物、间隔织物、网眼织物、缝编织物和复合织物依次介绍经编产业用纺织品的生产、应用和发展趋势。     

Three-dimensional weft-knitted textile fabrics-based capacitors

Wearable electronics have evolved from electronic components secured on the human body with straps and belts to partial electronic components integration onto textile structures. Cables and standard components defeat the purpose of the wearable approach by being bulky, rigid and especially not being able to withstand standard textile cleaning/care methods (washing, dry-cleaning, etc.). New 3D textile structures can provide a promising solution. In this research project, we examined the capacitive behaviour of specially prepared 3D weft knitted textile fabrics. The samples knitted specially for this project incorporated conductive outer layers and an insulating inner layer. The outer layers form the plates of the capacitor and the insulating layer plays a role of the dielectric material between the two plates. The structure of these 3D knits allows for inherent capacitive behaviour of the material. These 3D weft-knitted fabrics can be produced on usual existing knitting machines, without any need of dedicated, specialized or expensive equipment. The expected values of the capacitance, based on theoretical calculations, satisfactorily approach the values derived from the measuring process. The ability to customize the structure and hence the capacitance of the 3D fabrics-based capacitors is a positive point towards the design of the textile-based electronics systems in the future. Therefore, the development of textile capacitors based on the 3D fabrics is expected to be an essential contribution to the integration of the wearable system concept.     

智能纺织品及其在不同领域中的应用

随着多学科的相互渗透和融合,智能纺织品获得了前所未有的发展.文章对智能纺织品的概念进行了阐述,介绍了智能纺织品的研究方向,及其在军事、体育运动、特种防护等领域中的应用,并对智能纺织品的未来进行展望.     

激光切割纺织面料的数据库设计与应用

激光切割纺织面料时要对不同加工对象调节激光参数的设置,而精确预测或自动获得工艺参数相当困难.通过系统实验获取大量工艺参数,在不同工艺的激光功率、切割速度等参数设定下,量化确定激光切割系统的切割精度.建立了基于实验的最佳激光切割工艺参数数据库,使得有效范围内的加工能自动获得切割参数.对常用的纺织面料测定切割图形精度进行误差分析,结果表明,激光切割效果完全满足服装加工制造的要求,实现了激光切割纺织面料的自动化.     

牛奶蛋白复合纤维的应用性能研究及其产品开发

文章介绍了牛奶蛋白复合纤维的物理性能,并对其耐日光性、热稳定性、耐酸碱性、染色性等应用性能进行了研究,为产品开发奠定了理论基础.根据该纤维的特性,制定了牛奶蛋白复合纤维与其它纺织纤维混纺的生产工艺技术路线.为了最优化地体现牛奶蛋白复合纤维柔软亲肤的穿着舒适性、抗菌防蛀的穿着服用性以及真丝般的自然光泽,开发了高档的毛纺针织休闲装产品和机织轻薄衬衫面料.产品经测试,服用性能指标全部合格.     

手术用包扎布和衬垫材料的开发

叙述了手术用纺织品的服用及生理学的一般要求.着重强调了间隔织物的优点.从生产间隔织物的技术前提出发,总结了各种新型手术用纺织品在实验室条件下的测试结果,并与现有的结构相比较.研究了间隔织物、非织造布、复合材料及可回收或不可回收材料做的手术用纺织品.     

纺织面料数据库的建设及教学意义

数据库采用php语言和mysql数据库,以wordpress为内容管理系统,联系教学需求和学生学习实际,归纳整理相关面料知识,汇总面料产品信息。联合样品室,帮助学生查找面料参数,课后自主学习,为样品室的管理提供便利并实现辅助教学。     

高档内衣面料一浴法染色工艺

在锦纶经编网底上,用粘胶线绣花的高档内衣面料,通过染料、助剂的筛选及工艺的探讨,摸索出了一种用酸性染料、直接染料一浴法染色,可达到良好的同色效应或异色效应的染色工艺,且各种色牢度及相关有害物质的限量均0eko-Tex-standard100的要求。     

论传统染色工艺在现代纺织美术中的地位

当前,传统染织品在现代纺织美术中的地位正在不断提高。这首先是因为现代美术的潮流正向着质朴、简洁、大方、明快的方向发展,其次是传统染织品本身具有独特的魅力。但传统染织品要进一步发展,还必须在保持民族风格的同时不断完善、创新,而随着现代科学技术的进步,艺术与技术的结合也显得更加重要。     

经编织物的尺寸和几何特性

详尽地讨论了经编织物的尺寸特性和几何特性.虽然从正面观察,经编和纬编织物的成圈结构是相似的,但它们的物理和机械性能有很大的差别.     

形状记忆合金在纺织业应用的研究进展

综述形状记忆合金在各种花式纱线、动感织物中的形状记忆效果,在各种功能织物中的应用。     

双轴向和多轴向加固经编织物

描述了双轴向和多轴向加固经编织物特点和应用。详细讨论了双轴向和多轴向加固经编织物的具体应用实例。指出未来产业用纺织品市场对于结构更加复杂的直面和曲面的三维构型经编织物将产生需求。