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The Deformation Behaviors and Mechanism of Weft Knitted Fabric based on Micro-scale Virtual Fiber Model
International Journal of Mechanical Sciences ( IF 7.3 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.ijmecsci.2020.105929
Liwei Wu , Feng Zhao , Junbo Xie , Xianyan Wu , Qian Jiang , Jia-Horng Lin

Abstract As a reinforced structure in composites, knitted fabric has fully forming and large deformation behaviors that cannot be achieved by other fiber-reinforced structure due to the special loop structure formed by knitting process. Therefore, the knitted fabric and its composite are widely used in aerospace, medical and energy fields, such as satellite antenna, vascular scaffold, etc. This paper presents a novel modeling method for predicting knitted fabric deformation, that is, a virtual fiber model established at micro scale and is applied to build weft knitted model. The stress and strain distributions of repeated unit cell (RUC) and the whole fabric stretched in different directions were analyzed through finite element analysis. In addition, detailed analysis and characterization are conducted for the deformation of yarn cross section under uniaxial stretching. A 4 × 4 virtual fiber fabric model is established to verify the applicability of single loop model on the fabric scale. The mechanical properties predicted are in good agreement with the experiment, indicating the effectiveness of the virtual fiber model. Compared with traditional mesoscale models, the interaction among fibers and non-linear features of yarns under large deformation can both be well simulated by virtual fiber model, especially under large deformation.

中文翻译:

基于微尺度虚拟纤维模型的纬编针织物变形行为及机理

摘要 针织物作为复合材料中的一种增强结构,由于针织工艺形成的特殊毛圈结构,具有其他纤维增强结构无法实现的充分成型和大变形行为。因此,针织物及其复合材料广泛应用于航空航天、医疗和能源领域,如卫星天线、血管支架等。本文提出了一种预测针织物变形的新建模方法,即建立虚拟纤维模型。在微观尺度上,并应用于建立纬编模型。通过有限元分析,分析了重复晶胞(RUC)和不同方向拉伸的整个织物的应力和应变分布。此外,对单轴拉伸下纱线截面的变形进行了详细的分析和表征。建立了一个 4×4 的虚拟光纤织物模型,以验证单回路模型在织物规模上的适用性。预测的力学性能与实验吻合良好,表明了虚拟纤维模型的有效性。与传统的中尺度模型相比,虚拟纤维模型可以很好地模拟大变形下纤维之间的相互作用和纱线的非线性特征,尤其是在大变形下。表明虚拟纤维模型的有效性。与传统的中尺度模型相比,虚拟纤维模型可以很好地模拟大变形下纤维之间的相互作用和纱线的非线性特征,尤其是在大变形下。表明虚拟纤维模型的有效性。与传统的中尺度模型相比,虚拟纤维模型可以很好地模拟大变形下纤维之间的相互作用和纱线的非线性特征,尤其是在大变形下。
更新日期:2020-12-01
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