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A macroscale finite element approach for simulating the bending behaviour of biaxial fabrics

机译：模拟双轴织物弯曲行为的宏观有限元方法

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摘要

A macroscale finite element (FE) model was developed to simulate the forming behaviour of biaxial fabrics, incorporating the effects of bending stiffness to predict fabric wrinkling. The dependency of the bending stiffness on the fibre orientation was addressed by extending a non-orthogonal constitutive framework previously developed for biaxial fabric materials. The nonlinear bending behaviour of a biaxial non-crimp fabric (NCF) with pillar stitches was characterised by a revised cantilever test using structured light scanning to measure specimen curvature, providing input data for the material model. Simulations were performed to replicate the bias-extension behaviour of the NCF material, showing good agreement with experimental data. Wrinkles were observed within the central area of the specimen at low extension, which consequently affect the uniformity of the shear angle distribution in the region where pure shear is expected.
机译：建立了宏观有限元（FE）模型来模拟双轴织物的成形行为，并结合了弯曲刚度的影响来预测织物的起皱。通过扩展先前为双轴织物材料开发的非正交本构框架，可以解决弯曲刚度对纤维取向的依赖性。带有立柱针脚的双轴不卷曲织物（NCF）的非线性弯曲行为通过修订的悬臂测试来表征，该测试使用结构化光扫描来测量样品曲率，从而为材料模型提供输入数据。进行了模拟以复制NCF材料的偏压-延伸行为，表明与实验数据吻合良好。在样品的中心区域低延伸处观察到皱纹，因此影响了预期纯剪切区域的剪切角分布的均匀性。

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