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Traction Law For Inclined Through-thickness Reinforcement Using A Geometrical Approach

机译：倾斜法通过几何方法加固厚度的牵引定律

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摘要

Stitching of laminated composites is a proven way to improve damage tolerance and increase interlam-inar fracture toughness. However, the size and shape of various composite parts manufactured across many industries has limited possible applications of stitching. Innovative one-sided stitching techniques incorporating inclined stitches have emerged to overcome these limitations.rnModels for determining traction laws for individual stitches including inclined stitches have progress over the years but with limitations. A model for analysing a stitch, pin or other through-thickness reinforcement in a composite laminate has been developed and validated with finite element analysis (FEA). This model is formulated based on treating the stitch as a rope supported by a plastic foundation, with pull-out resisted by frictional stresses. A new approach was taken to determine the displacement by integrating the function describing the shape of the stitch. The model accurately predicts the traction law of a stitch and is most accurate for cases where μ and 0_o are small. This model can be incorporated with FEA to simulate the delamination of laminates. This reduces the need for expensive experimental testing and allows for the most effective stitching parameters to be determined, resulting in optimal design.
机译：层压复合材料的缝合是提高损伤耐受性并增加层间断裂韧性的一种行之有效的方法。但是，跨许多行业生产的各种复合部件的尺寸和形状限制了缝合的可能应用。为了克服这些限制，已经出现了结合倾斜针的创新性单面缝合技术。多年来，用于确定包括倾斜针的单个针的牵引定律的模型已经取得了进展，但是存在局限性。已经开发了一种用于分析复合材料层压板中的针脚，大头针或其他全厚度补强材料的模型，并已通过有限元分析（FEA）进行了验证。该模型的建立是基于将针脚视为由塑料基础支撑的绳索，并通过摩擦应力来抵抗拉拔。通过整合描述针迹形状的功能，采用了一种新方法来确定位移。该模型可以准确地预测针的牵引定律，并且对于μ和0_o小的情况最准确。该模型可以与FEA结合使用，以模拟层压板的分层。这减少了对昂贵的实验测试的需求，并允许确定最有效的缝合参数，从而实现最佳设计。

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