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Model of shear of woven fabric and parametric description of shear resistance of glass woven reinforcements

机译：机织织物的剪切模型和玻璃纤维增​​强材料的抗剪切性的参数描述

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Forming simulations of textile preforms require a description of the shear resistance of the preform plies. Experimental determination of the shear diagrams is time consuming, costly and requires highly qualified personnel. Typical glass rovings exhibit quite consistent behaviour, described by diagrams for bending, compression and tension, in function of linear density of the rovings. Based on these representative diagrams, a parametrical study of the shear resistance of glass preforms has been carried out, using a model, which accounts for different sources of the fabric resistance to shear: friction, compression of the yarns, yarn (un)bending, Possible simultaneous action of shear and (pre)tension is taken into account. The model (validated against experimental data) generates shear diagrams for plain, twill and 5-harness satin square fabrics. The diagrams were then processed to create analytical expressions of the shear diagrams: T= T_0 + T_1 tan~aγ, where T is the shear force, γ is the shear angle, a, T_0, and T_1 are parameters, tabulated as functions of yarn linear density, fabric tightness and pretension. The value of a was found to be close to 2 in all the cases. The resulting family of shear diagrams was verified against experimental data.
机译：纺织品预成型坯的成型模拟需要描述预成型坯布层的抗剪强度。剪切图的实验确定是耗时的，昂贵的并且需要高素质的人员。典型的玻璃粗纱表现出相当一致的行为，如粗纱的线密度的函数所示，通过弯曲，压缩和拉伸的图表进行描述。根据这些代表图，已使用模型对玻璃瓶坯的抗剪强度进行了参数研究，该模型说明了织物抗剪强度的不同来源：摩擦，纱线压缩，纱线（未弯曲），考虑了剪切和（预）张力的可能同时作用。该模型（针对实验数据进行了验证）可生成平纹，斜纹和五线缎面方形织物的剪切图。然后对这些图进行处理以创建剪切图的解析表达式：T = T_0 + T_1 tan〜aγ，其中T为剪切力，γ为剪切角，a，T_0和T_1为参数，并按纱线函数列出线密度，织物紧密度和预紧力。发现在所有情况下a的值都接近于2。所得的剪切图系列已通过实验数据进行了验证。

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