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Improving strength of postbuckled panels through stitching

机译：通过缝合提高后屈板的强度

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The behavior of blade-stiffened graphite-epoxy panels with impact damage is examined to determine the effect of adding through-the-thickness stitches in the stiffener flange-to-skin interface. The influence of stitches is evaluated by examining buckling and failure for panels with failure loads up to 3.5 times greater than buckling loads. Analytical and experimental results from four configurations of panel specimens are presented. For each configuration, two panels were manufactured with skin and flanges held together with through-the-thickness stitches introduced prior to resin infusion and curing and one panel was manufactured with no stitches holding the flange to the skin. No mechanical fasteners were used for the assembly of any of these panels. Panels with and without low-speed impact damage were loaded to failure in compression. Buckling and failure modes are discussed. Stitching had little effect on buckling loads but increased the failure loads of impact-damaged panels by up to 30%.
机译：检查了叶片加硬的石墨环氧树脂板在受到冲击破坏时的行为，以确定在加劲肋的法兰与皮肤之间的界面上添加贯穿厚度的针迹的效果。通过检查面板的屈曲和破坏来评估针迹的影响，面板的破坏载荷要比弯曲载荷大3.5倍。给出了四种面板样本的分析和实验结果。对于每种配置，制造两块面板时将表皮和法兰固定在一起，并在树脂注入和固化之前引入贯穿厚度的针脚，制造一块面板时不使用针脚将法兰固定到皮肤上。没有使用机械紧固件来组装任何这些面板。带有和不带有低速冲击损坏的面板都加载失败。讨论了屈曲和失效模式。缝合对屈曲载荷影响很小，但将受冲击损坏的面板的破坏载荷增加了多达30％。

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