纺织结构的数值模拟:潜力和限制

Karolína Boňková
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引用次数: 0

摘要

数值模拟,即有限元建模,是许多工程分支的标准化工具。在纺织工程中,由于结构的复杂性,使用这种方法存在许多局限性。尽管存在局限性,纺织品的有限元建模在未来仍有巨大的潜力。本文研究了平纹针织物纵向和纵向拉伸试验的有限元模型。该模型选择了结构的细观水平,因此可以跟踪纱线在模拟变形过程中的交错行为。根据涤纶单丝针织织物样品的参数,建立了虚拟模型。在制备有限元模型时,采用单丝代替短纤维,可以消除纱线中纤维间的接触。采用MSC Marc Metant隐式计算和ANSYS LS-DYNA显式计算两种不同的计算程序进行模拟。对隐式求解和显式求解的结果进行了比较和讨论。对模型进行了验证,并将结果纳入讨论。由于纺织品变形大,显式求解法更适合于纺织工程中的有限元建模。
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NUMERICAL MODELLING OF TEXTILE STRUCTURES: POTENTIAL AND LIMITS
Numerical modelling, namely finite element modelling, is a standardised tool in many branches of engineering. In textile engineering, due to the complexity of the structure, many limitations occur in using this approach. Despite the limitations the finite element modelling of textiles has huge potential for the future. This contribution deals with FE modelling of tensile test in wale and course direction of single jersey knitted fabric. The meso level of the structure was chosen for the model, so it could be possible to track the behaviour of yarn interlacement during the simulated deformation. The virtual model was created according to parameters of single jersey knitted fabric sample, which was produced from polyester monofilament. By using monofilament instead of staple yarn, contacts between fibres in yarn could be excluded in FE model preparation. Two different computational programs were used for simulations – MSC Marc Metant for implicit computing approach and ANSYS LS-DYNA for explicit computing approach. The results from implicit and explicit solver were compared and discussed. Validation of models was done and results were included in the discussion. Due to big deformations of textiles, explicit solver appears to be more suitable for finite element modelling in textile engineering.
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