氨纶弹力机织物弹性与结构因素的关系

通过改变氨纶弹力织物的组织，经纬纱密度等结构因素，观察组物弹性值的变化。根据有关实验数据建立了弹性值与经、纬纱密度之间的幂函数数学关系模型，提出了极限纱线密度的概念，总结了结构因素对于氨纶弹力物弹性的影响，并探讨了设计中如何合理配置这些因素。     

一种机织物增强柔性复合材料拉伸性能加载速度依赖性的试验研究

通过拉伸试验,研究加载速度在5～300 mm/min范围内机织物增强柔性复合材料的拉伸性能,对其在不同加载速度下的拉伸曲线以及各项拉伸性能指标随加载速度的变化趋势进行分析和讨论。试验结果表明:机织物增强柔性复合材料在各种加载速度下的拉伸曲线呈现明显的非线性,且其拉伸性能表现出明显的应变率依赖性;随着加载速度的提高,抗拉强度、拉伸弹性模量及屈服强度增加,断裂伸长率减小,而失稳应变的增加幅度较小。     

Effect of weft density and percentage of stainless steel fiber content of weft yarn on electrical properties of woven fabric strain sensors

Textile-based strain sensors have been used in smart textiles frequently. In this study, effect of percentage of stainless steel fiber of spun yarn (i.e. 28 and 40%) and weft density (i.e. 14, 18, and 22 per cm) of conductive yarn on performance and sensitivity of woven fabrics strain sensor under tensile cyclic loading in 3 mm elongation and also behavior of woven fabric strain sensors under simple tensile loading, was studied. Our finding showed the interaction between weft density and percentage of conductive fiber of spun yarns on performance and sensitivity of strain sensors under cyclic loading. Samples prepared by conductive yarns with 40% stainless steel fiber showed no clear cyclic variation in 18 and 22 weft per cm. This trend for samples woven with conductive yarn with 28% stainless steel fiber was only observed in 22 weft per cm. All samples showed the same trend of resistance variation during simple tensile loading, although the level of resistance variation was different. The slope of resistance variation during tensile cyclic loading confirmed plastic deformation of samples. Finally, by comparing the sensitivity of strain sensors during cyclic loading no obvious advantage was obtained for samples woven with conductive yarn with 40% stainless steel fiber compared with samples woven with conductive yarn with 28% stainless steel fiber.     

基于有限单元法的平纹织物复合材料强度预测:2.复合材料层合板拉伸过程的有限元分析

针对实际使用中平纹织物复合材料铺层角度问题,将0°/45°/90°/-45°铺层的层合板作为有限元分析对象,研究其犬骨试验件在单向拉伸作用下的响应。分析过程中,将试样视作宏观均匀的弹性材料,利用已得出的平纹织物复合材料的物性值,以8节点块单元对模型进行离散,通过分步施加载荷,得到复合材料的应力与应变曲线。与实测值作对比发现,仿真结果同实测结果相吻合。将节点反力作为复合材料单胞模型的边界条件,对复合材料进行失效预测。结果表明:角度铺层设计可以减弱细观结构的开裂和分层;且在承受相同的拉伸应力下,铺层复合材料单胞内树脂单元失效的数量少,因此具有更高的强度。     

织物组织结构对机织物力学性能的影响

纺织品组织结构对织物的外观和应用性能具有普遍的适用性,织物的最终用途在很大程度上取决于所用的材料及其物理特性。因此,织物的结构参数直接决定了织物的性能。研究了不同组织结构对织物力学性能(包括拉伸性能、撕裂性能和耐磨性能)的影响,主要探讨了平纹、斜纹和方平组织对织物力学性能的影响。     

洗涤条件对机织物水洗尺寸变化率的影响

在不同的洗涤条件下,对机织物的水洗尺寸变化率进行了对比试验,探讨了不同洗涤条件对机织物水洗尺寸变化率的影响。     

多层接结三维机织物的制备与结构分析

以经重平为基础组织制备了两种多层接结三维织物,分别对织物进行经纬向切片,通过对设计的结构示意图、已有几何模型图和实际结构图三者的比较,明确了已有几何模型与织物真实结构的差异,得到经纬纱在不同结构中的具体分布形态。     

机织土工织物结构参数与渗透性关系探讨

探讨了机织土工织物的织物组织、纱线细度、经纬纱密度等因素对织物渗透性的影响。确定了织物组织结构参数与渗透系数之间的回归关系。通过改变织物的组织结构参数使土工布具有不同的水力学性能,从而满足不同工程的要求。     

Study of graphite/silicon carbide coating of plain woven fabric for electrical megawatt absorbing properties

In this paper, plain woven fabric was selected as the base fabric. Graphite and silicon carbide were the surface layer and underlying layer absorbents, respectively. The influence of the content of the graphite and silicon carbide absorbent and coating thickness on the real part and the imaginary part of the dielectric constant, and the loss tangent are discussed. Through the optimization of electromagnetic parameters, graphite/silicon carbide double-coated polyester woven fabric absorbing materials with the best wave absorption performance were prepared.     

Finite element analysis of monofilament woven fabrics under uniaxial tension

Mechanical behavior of woven fabrics under tensile load is complex because their deformation could result from the combined effects of tension, compression, bending, and shear. In this study, the tensile behavior of woven fabrics is simulated using finite element method. The input parameters are the mechanical properties of constituent yarns obtained from tensile and friction coefficient tests and the geometry of woven fabric repeating unit. First, a 3D geometric model of the repeating unit based on Pierce’s model was built using computer-aided design tools. Then, finite element analysis which incorporates material properties, frictional contact, and periodic boundary conditions was implemented using ANSYS. A non-linear mechanical behavior was defined. Frictional contact algorithm for the cross-sectional zone of the repeating unit and periodic boundary conditions to the contour of the repeating unit was implemented. Numerical simulation data and experimental data were compared, which showed good agreement.     

铜镍金属涂层机织物拉伸过程中电流的响应

为探讨金属涂层机织物作为柔性传感器的传感性能,利用织物强力机和自制电流数据采集系统测试涤纶基金属涂层机织物不同速度下拉伸过程中的电流变化,讨论了电流对拉伸的响应规律,分析了不同拉伸速度对电流响应的影响以及经纬向灵敏度之间的差异。结果表明:涤纶基金属镀层机织物经纬向伸长与电流响应曲线在拉伸速度较高时具有较高的线性度,低速拉伸的电流响应曲线相比高速拉伸线性度差;织物经纬向灵敏度随着拉伸速度的增大而减小,其纬向比经向断裂伸长大,纬向的灵敏度高于经向,低速拉伸时该织物的经纬向均具有较大的灵敏度。     

平纹织物纱线截面形态经典理论探析及其泛化

平纹机织物内部纱线的截面一直被业界视为某种固定的形态,但应用可视化技术发现,基于经典的双凸截面模型存在问题,即使用微积分思路解决问题过程中,发现纱线截面变化的规律.研究结果表明,无论是单层机织物还是多层机织物,其纱线截面均呈现多元性,而非单一形态.特别是对于接结多层纬纱的经纱,其截面沿纱线长度方向按凹凸交变的规律呈周期性变化.这一研究成果对"织物纱线恒定截面论"提出了异议,对研究纱线的真实截面形态及织物外观模拟具有参考价值.     

紧密机织物高气压下面外变形的机制

为指导设计新型防护面料,依据其防护过程,探索了紧密机织物在高气压下面外变形的机制。结合能量理论和板壳理论,建立了紧密机织物在高气压下面外变形的系统能量平衡方程(机制模型),从能量最小化的角度预测织物变形后的最大变形量和变形轮廓曲线。通过自行搭建的织物变形仪测量了2类不同紧密程度的机织物面外变形情况。结果发现织物变形程度与其弹性模量呈负相关性,随后对织物变形的实验值与理论预测值进行了比较,发现二者之间的误差小于20%。从而证明该数学模型可较为精确地用来预测其他紧密机织物高气压下的面外变形。     

Anisotropy in geometrical and tensile properties of plain weave fabric: verifying a semi-empirical model

Geometrical and mechanical behaviors of fabric are extremely anisotropic. Exploit of fabric in multiplicity applications is dependent on its behavior in differ directions. Thus, attempts had been made to study the behavior of fabric in off and on axis systematically. For this purpose, authority of a semi-empirical model, based on earlier work, was experimentally investigated. The model consists of a numerical way to estimate yarn path under axial and normal tension simultaneously. A test method to evaluate flattening of yarn was presented in this study. Moreover, to reduce stress concentration at the sample’s corners a modified griper was applied. On the basis of initial data of fabric and flattening behavior of constitutive yarns, the fabric geometry and tensile force–strain (TF–S) curve of a strip fabric in arbitrary direction are capable to estimate using stated model. The variations in density of warp and weft yarns, shear angle, and TF–S curve of a fabric in different directions were measured and are compared with theoretical values. It was found that the stated model is applicable to predict fabric geometry and tensile behavior of a plain weave fabric under stress in arbitrary direction. Experimental results indicated that the strength of fabric at 45 degree was 22.59% higher than the strength of fabric in average of principal directions. On the basis of semi-empirical model, it is anticipated that the maximum strength of presented fabric would be occurred at 60 degree with 27.99% higher than the strength of fabric in average of principal directions.     

数码机织物组织结构的组合设计原理和方法

复杂结构机织物的设计过程繁琐,变化形式多样,常采用组织组合设计的方法来完成,随着数码机织物分层组合设计方法的提出,机织物的结构设计可以组织库设计的方法取代传统的单一组织的设计模式。在数码机织物全息组织和组织库设计的基础上,对以组织库为基础的组合结构设计原理进行深入分析,并提出合理的设计方法。该研究成果可方便地应用于数码机织物的产品设计,特别是分层组合设计模式下数码提花织物的创新设计。     

芳纶机织骨架材料增强轻型输送带的拉伸性能研究

轻型输送带的拉伸性能是其产品质量的重要指标,作为染整印花工作平台的轻型输送带对拉伸性能提出了更高的要求.为提高芳纶机织增强轻型输送带的拉伸性能,分别针对芳纶骨架材料定型处理的工艺和成品测试试样的规格对芳纶织物增强轻型输送带拉伸性能的影响进行观察与分析.结果表明:涂胶预定型处理能有效提高芳纶骨架材料增强输送带的拉伸强度、...     

纵横双向变厚度三维机织物组织设计

阐述纵横双向变厚度三维机织物的结构设计原理,选用多层接结组织为基础,在纵向连续变厚度结构的设计基础上,合理设计经向垫纱的分布方案,完成了纵横双向变厚度三维机织物的组织设计。     

广角机织物的织造工艺及其偏轴拉伸力学性能

为开发适用于不同应用领域的产业用纺织品,在对原有普通剑杆织机改进的基础上,探讨了广角机织物的织造工艺,织造了经纱和纬纱夹角为120°的涤/棉平纹广角机织物。借助万能材料试验机研究了普通涤/棉正交织物和广角机织物不同偏轴方向的拉伸力学性能,获得了其应力-应变曲线和特征值变化规律,并分析了其变形及失效模式。结果表明:对于普通正交机织物和广角机织物,其拉伸断裂强力均呈现出明显的极轴特性;在断裂强力相同的情况下,与普通正交机织物相比,广角机织物纬向的断裂伸长率提高了30%,经、纬向弹性模量分别提高了42%和79%,展现出优异的强度和变形特征。     

Anisotropy in wrinkle properties of woven fabric

In this paper, the wrinkle resistance of plain fabrics woven with weft yarn in S‐ and Z‐twist directions and at various twist levels in different test directions has been measured and then analysed. Results show that the wrinkle resistance increases as the weft yarn twist increases. The wrinkle properties of the fabric show that the direction of test has an obvious effect on the results and the wrinkle resistance depends on the method of folding such as face‐to‐face and back‐to‐back methods. The experimental results showed that there is anisotropy in wrinkle properties of the fabric made of yarns with different twist directions. When the fabric is folded face‐to‐face and the weft twist direction is S, the wrinkle resistance of fabric in various test directions shows a convex curvature, whereas when the same fabric is folded in a back‐to‐back manner then results show a linear curvature. This means that the wrinkle resistance of a fabric differs in various directions and in the method of folding (back‐to‐back or face‐to‐face) and shows an anisotropic wrinkle resistance nature.