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与标准的圆型开孔相比,这种新型的正弦曲线型开孔的蜂窝梁显示了其独特的性能。对3个有着不同开孔尺寸的梁进行足尺试验。试验旨在观察这些梁的失效模式,从而获得其强度的极限值。这些试验样本确定了可开孔区域的局部失效模式。通过观察两种特定的失效模式发现,有较大开孔样本的失效模式在临界截面转角处的4个塑性铰处发生了变形(空腹桁架屈曲),这种失效模式与矩形开孔的失效模式相似;而有效小开孔的样本则在正弦曲线型开孔的受压面板处发生了局部失稳。为此,建立一个数值模型并根据试验结果进行校正。该数值模型被用于更详细地分析标准开孔的性能,包括在其不同位置的应力分布。试验结果所提供的定性定量信息可用于研究正弦型开孔的蜂窝梁的性能。此数值模型可较为精准地预测试验结果,因此可作为一种工具来更新补充试验结果,从而进一步完善分析模型。
This new sinusoidal perforated honeycomb beam shows its unique properties compared to a standard circular aperture. Three full-size beams with different hole sizes were tested. The purpose of the experiment is to observe the failure modes of these beams and to obtain their ultimate strength values. These test samples determine the local failure mode of the openable area. By observing two specific failure modes, it was found that failure modes with larger open-cell specimens deform at four plastic hinges at the critical cross-section corners (fasting truss buckling). This failure mode is similar to the failure mode of rectangular openings Similar to the experimental results, the sample with effective small aperture was locally buckled at the sinusoidal aperture. For this purpose, a numerical model is established and corrected based on the test results. This numerical model is used to analyze the properties of standard openings in more detail, including stress distribution at different locations. The qualitative and quantitative information provided by the test results can be used to study the performance of a sinusoidal perforated honeycomb beam. This numerical model predicts test results more accurately and can therefore be used as a tool to update supplemental test results to further refine the analysis model.