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为了建立具有不同拉伸和压缩弹性模量的缝合三明治夹芯结构梁的中性层位置和弯曲刚度的理论预测方法,并进行相关试验验证。首先,将缝合三明治夹芯结构梁看成准层状结构,考虑其拉压不同模量及材料上下面板几何尺寸不同的特点,基于修正的Reissner层板理论,建立了弯曲刚度和中性层位置的理论预测方法;其次,开展了缝合三明治夹芯结构梁的三点弯曲试验,并采用数字图像相关(DIC)法测试了中性层位置;最后,对弯曲刚度和中性层位置进行了理论预测。结果表明:理论预测值与试验结果吻合较好,证明了该理论预测方法的有效性。
In order to establish a theoretical prediction method for the neutral layer position and bending stiffness of stitched sandwich sandwich beams with different tensile and compressive elastic modulus, and to verify the relevant experiments. First, the stitched sandwich sandwich beam is regarded as a quasi-layered structure. Considering the different modulus of tension and compression as well as the geometrical dimensions of the upper and lower panels, a modified Reissner laminar theory is used to establish the bending stiffness and neutral layer position Then, the three-point bending test of stitched sandwich sandwich beam was carried out, and the position of neutral layer was tested by Digital Image Correlation (DIC) method. Finally, the theory of bending rigidity and neutral layer position prediction. The results show that the theoretical predictions agree well with the experimental results, and the validity of the theoretical prediction method is proved.