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Cutout Shape And Reinforcement Design For Composite C-section Beams Under Shear Load

机译：剪力作用下复合截面C型梁的切口形状及加固设计

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摘要

This paper reports a study of the performance of two forms of cutout and various edge reinforcements in a composite C-section beam under static shear load. Firstly, cutout shape effect on stress concentration was studied. This was followed by a comparative study of a range of reinforcement doublers, which were 20 mm wide rings made of a steel alloy or composite laminate, or by a novel fibre tow placement technique. The comparisons are made in terms of the stress and strain reductions at a hot spot at the cutout edge. Good agreement between the numerical and test results has been achieved for different cutout shapes and reinforcements, and this study has demonstrated that the cutout induced stress concentration can be reduced significantly by appropriate cutout shape and edge reinforcements. The stress reduction magnitude is found to be strongly related to the stiffness of the reinforcement rings. The diamond-shaped cutout and the fibre tows reinforcement show clear advantages over the widely adapted circular cutout and laminated ring reinforcement. These findings should contribute to future design improvement of composite aircraft structures in similar shape and loading conditions.
机译：本文报道了在静态剪力作用下，复合C型截面梁中两种形式的切口和各种边缘钢筋的性能研究。首先，研究了切口形状对应力集中的影响。随后进行了一系列增强倍增器的对比研究，这些倍增器是由钢合金或复合材料层压板制成的20 mm宽环，或者是采用新型的纤维束放置技术。根据切口边缘热点处的应力和应变降低进行比较。对于不同的切口形状和钢筋，已经在数值和测试结果之间取得了良好的一致性，并且这项研究表明，通过适当的切口形状和边缘钢筋，可以大大降低切口引起的应力集中。发现应力减小幅度与加强环的刚度密切相关。与广泛采用的圆形切口和叠层环形加强件相比，菱形切口和纤维束增强件具有明显的优势。这些发现将有助于未来在类似形状和载荷条件下复合材料飞机结构的设计改进。

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