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采用三点弯曲实验方法,研究以铝为面板的泡沫铝夹层梁的弯曲变形行为。研究表明,所有夹层梁的三点弯曲力-位移曲线都包括线性区、力快速下降区和平台区。在三点弯曲过程中,夹层梁和泡沫铝的力-位移曲线变化趋势相似,夹层梁的力-位移曲线远高于泡沫铝和2倍面板的力-位移曲线之和。夹层梁的抗弯强度随着面板厚度的增加而增大,随着芯板厚度的增加而减小。且当面板厚度由1 mm增加为3 mm时,截面面积增加了15%,其极限载荷增加了149%。泡沫芯板的初始压塌和剪切破坏,以及在大弯曲载荷下的粘接界面的分层是夹层梁弯曲过程中的主要失效模式。
Using three-point bending test method, the bending deformation behavior of aluminum foam sandwich panel with aluminum panel is studied. The study shows that the three-point bending force-displacement curves of all sandwich beams include the linear region, the force rapidly decreasing region and the platform region. In the three-point bending process, the force-displacement curves of sandwich beam and aluminum foam have similar trend. The force-displacement curve of the sandwich beam is much higher than the sum of the force-displacement curves of aluminum foam and 2-fold panel. The bending strength of mezzanine beam increases with the thickness of the panel and decreases with the thickness of the core. And when the panel thickness increased from 1 mm to 3 mm, the cross-sectional area increased by 15% and the ultimate load increased by 149%. The initial collapse and shear failure of the foam core, as well as the delamination of the bonding interface under large bending loads, are the main failure modes during the bending of the sandwich beam.