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Slip-bias extension test: A characterization tool for understanding and modeling the effect of clamping conditions in forming of woven fabrics

机译：滑动偏置延长试验：用于理解和建模夹紧条件在成型织物中的效果的表征工具

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摘要

It has been well recognized that intra-ply shear and inter-ply slippage are the principal mechanisms allowing the woven fabrics to conform to doubly-curved geometries. The implication of boundary conditions on the forming response of this class of reinforcements is complex in nature, and time-consuming simulations are often needed during process optimization. This study aims to better understand the influence of sliding boundary conditions during forming process of woven fabrics, via a new well-controlled 2D characterization test (termed Slip-bias Extension test). Thereby, a modified shear stress formulation has been developed for the sake of faster 3D simulations, while accounting for the effect of frictional interactions between the fabric and blank holder at different shear angles, normal pressures, and under asymmetric gripping conditions. A key advantage of the new equivalent formulation is that the frictional contact between the ply and the tool at various shear angles and normal pressures does not need to be explicitly modeled in the simulations. The overall applicability of the proposed test and modeling framework is validated against a hemispherical forming of a plain carbon woven fabric. Results suggested an improved modeling accuracy under different forming configurations while reducing the run time by 20%.
机译：已经很公认，帘布利剪切和层间滑动是允许织造织物符合双弯曲几何形状的主要机理。边界条件对这种增强材料的成形响应的含义本质上是复杂的，并且在过程优化期间通常需要耗时的模拟。本研究旨在通过新的控制织物的形成过程中更好地了解滑动边界条件的影响，通过新的良好控制的2D表征测试（称为滑动偏移试验）。因此，为了更快的3D仿真而开发了一种改进的剪切应力制剂，同时占织物和空白支架之间的摩擦相互作用在不同的剪切角，正常压力和不对称夹持条件下的影响。新的等效配方的关键优点是，在模拟中不需要明确地建模在各种剪切角和正常压力下的层和工具之间的摩擦接触。所提出的测试和建模框架的总体适用性验证了普通碳织物的半球形成型。结果表明在不同的成形配置下提高了建模精度，同时将运行时间降低20％。

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