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A simplified and semi-analytical bolted joint model for crash and impact simulations of composite structures

机译：复合结构碰撞和冲击模拟的简化和半分析螺栓连接模型

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In this study a simplified empirical approach is developed to describe the overall behaviour of a composite bolted joint for explicit crash and impact simulations. Based on analytical equations, classical laminate theory and empirical factors, a trilinear force-displacement curve is proposed for bolted joints under in-plane loads. The empirical factors are derived from single-lap shear experiments of carbon fibre prepreg specimens (Hexcel M18-1/G939) with different fasteners. Quasi-static and high-rate dynamic tests are assessed and two main influencing factors for the differences in the overall load levels are identified: the fastener type (solid/hollow rivet) and head type (protruding/countersunk head). Based on these results, a novel generalised model is developed, which prevents expensive physical and virtual testing for a variety of possible fastener/material configurations and significantly reduces the modelling effort. It is shown that the analytical and empirical expressions can easily be adapted in commercial finite element codes such as Abaqus/CAE and rely on few user input parameters.
机译：在本研究中，开发了一种简化的经验方法来描述复合螺栓接头的整体行为，用于显式碰撞和影响模拟。基于分析方程，古典层压理论和经验因素，提出了在面内载荷下的螺栓接头的三线性力 - 位移曲线。具有不同紧固件的碳纤维预浸料标本（六种M18-1 / G939）的单圈剪切实验来源于不同紧固件的经验因素。评估准静态和高速率动态测试，并识别出总负载水平差异的两个主要影响因素：紧固件型（固体/空心铆钉）和头型（突出/埋头头）。基于这些结果，开发了一种新的广义模型，这防止了对各种可能的紧固件/材料配置的昂贵的物理和虚拟测试，并显着降低了建模努力。结果表明，分析和经验表达式可以很容易地适用于商业有限元代码，例如ABAQUS / CAE，并依赖于少量用户输入参数。

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