三维正交织物织造过程模拟及其微观几何结构预测  

Weaving process modeling and micro-geometry prediction of three-dimensional orthogonal woven fabrics

作　　者：马莹 向卫宏 赵洋 邓聪颖[1,2] 禄盛 曾宪君[4] MA Ying;XIANG Weihong;ZHAO Yang;DENG Congying;LU Sheng;ZENG Xianjun(School of Advanced Manufacturing Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Institute for Advanced Study,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;State Key Laboratory for Strength and Vibration of Mechanical Structures,Xi′an Jiaotong University,Xi′an,Shaanxi 710049,China;Green Aerotechnics Research Institute,Chongqing Jiaotong University,Chongqing 401135,China)

机构地区：[1]重庆邮电大学先进制造工程学院,重庆400065 [2]重庆邮电大学高等教育学院,重庆400065 [3]西安交通大学机械结构强度与振动国家重点实验室,陕西西安710049 [4]重庆交通大学绿色航空技术研究院,重庆401135

出　　处：《纺织学报》2023年第6期105-113,共9页Journal of Textile Research

基　　金：国家自然科学基金青年科学基金项目(12002070);重庆市自然科学基金面上项目(CSTB2022NSCQ-MSX1115);重庆市留学人员回国创业创新项目(cx2018126)。

摘　　要：为获得更为精确的织物模型,以满足织物及其纺织复合材料力学性能和破坏机制分析的需要,针对多尺度材料几何结构建模中存在宏观和介观尺度理想化假设,从而导致织物微结构特征缺失的问题,基于数字单元法理论,在纤维尺度提出一种织物织造过程动态仿真方法。该方法建立了织机关键部件的几何模型,由织造矩阵控制开口运动,通过计算纤维间的相互作用力,模拟织机五大运动,得到4个处于不同织造时期的单胞组成的三维正交织物数值模型。研究结果表明:织物单胞的微观几何结构受相邻单胞的影响,在织造过程中发生变化;最上层和最下层纬纱的应力高于中间层纬纱;模型较为准确地描述了纱线的卷曲、路径和横截面形状等织物的主要特征。Objective Fiber-reinforced polymer composites comprise aligned,random,or woven fibers in polymeric matrix.The commonly used woven fabric-reinforced composites made of high-performance fibers are frequently used in applications that require durability in aggressive environments.To achieve deep-level exploitation for engineering applications,modelling of the fabric′s microgeometry and the mechanical response is crucial.However,research to characterize these microstructures highly depends on its microscope images and assumes constant yarn cross-sectional shape,which is not the case for most woven fabric types.Since the fiber architecture of woven fabrics has a profound effect on their mechanical properties,a dynamic simulator capable of modelling fabric weaving process considering textile mechanics is necessary.Method A dynamic textile weaving simulator was established to link weaving actions to fabric patterns and microstructures.Digital element approach(DEA)was implemented under the framework of the software package digital fabric and mechanics analyzer(DFMA).This method established the geometrical model of the key components of a loom.Yarn interlacing motion was guided by weaving matrix specified by steps.Shedding,weft insertion,beat-up,let-off motion,and take-up actions are modelled.The inter-fiber contact force,fiber forces(tensile,shear,and bending),and boundary conditions in weft direction are considered utilizing the central difference algorithm.The weaving process of four unit-cells in the warp direction of a 10-layer three-dimensional orthogonal woven fabric was explicitly modelled at filament-level to derive for its microgeometry.Results It took 160 steps in total to complete the process,each cell takes 40 steps to weave.During each step,heddles lift or lower the connected warp or binder yarn to form a space between the fell and heddle.Then,the shuttle moves across the encircled space and layers on weft yarn followed by the beat-up motion.The results show that the micro-geometry of the unit-cell is affe

关 键 词：织造过程 数字单元法 三维正交织物 微观几何结构 应力分布 

分 类 号：TS105.1[轻工技术与工程—纺织工程]