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Micro-leveled modeling of structural stitched FRP joints as energy absorbing rupture points

机译：结构缝合的FRP接头作为能量吸收断裂点的微观模型

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Compared to their capability for compression loads, continuous fiber reinforced polymers show poor energy absorption capability for tensile or bending loads. An appropriate structural design must compensate this disadvantage. Following an integrated lightweight strategy, connecting elements can be addressed as energy absorbing points. Consequently, textile seams between FRP components can be used. Adapting the stitching layout allows the failure process to be adjusted. However, appropriate design principles have to be identified in order to optimize the energy absorption. For this purpose, a parametrized finite element model of a single lockstitch was developed based on real stitching geometries and validated with experimental data. The validated numerical analysis helps in evaluating the influence of the thread properties and the stitching design. The parameter study reveals a strong influence of the thread material. In a loaded seam, polyamide yarns with a distinctive plasticity offer much better energy absorption capacity than high tenacity UHMWPE ( Dyneema) threads. Furthermore, friction between the yarn and the surrounding material as well as wide stitch lengths are beneficial for energy absorption. (C) 2016 Elsevier Ltd. All rights reserved.
机译：与压缩载荷的能力相比，连续纤维增强聚合物在拉伸或弯曲载荷下的能量吸收能力较差。适当的结构设计必须弥补这一缺点。遵循集成的轻量级策略，可以将连接元素视为能量吸收点。因此，可以使用FRP组件之间的接缝。调整针脚布局可以调整故障过程。但是，必须确定适当的设计原理以优化能量吸收。为此，基于实际缝合几何形状开发了单个平缝的参数化有限元模型，并用实验数据进行了验证。经过验证的数值分析有助于评估线属性和针迹设计的影响。参数研究揭示了螺纹材料的强大影响。在高负荷接缝中，具有明显可塑性的聚酰胺纱线比高韧性UHMWPE（迪尼玛）纱线具有更好的能量吸收能力。此外，纱线与周围材料之间的摩擦以及较宽的线迹长度有利于能量吸收。 （C）2016 Elsevier Ltd.保留所有权利。

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