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金属梯度多孔材料芯层的胞孔壁厚度及半径沿芯层厚度方向逐渐变化,使得芯层的材料参数如密度和弹性模量等逐渐变化;采用金属梯度多孔材料代替传统均质多孔芯层会影响夹芯板的振动特性。基于高阶夹芯板理论且考虑梯度多孔芯层密度和弹性模量的耦合影响,建立了复合材料面层-金属梯度多孔夹芯板的振动方程。分析了3种密度的梯度芯层:单向分布、正梯度对称分布和负梯度对称分布对夹芯板固有频率的影响;最后讨论了3种梯度夹芯板在相同三角脉冲载荷作用下的振动响应。计算结果表明梯度芯层密度对称分布的夹芯板固有频率大于单向分布的夹芯板固有频率。
The cell wall thickness and radius of the metal gradient porous material core gradually change along the thickness direction of the core layer, so that the material parameters of the core layer, such as density and elastic modulus, gradually change. Using the metal gradient porous material instead of the traditional homogeneous porous core layer Affect the vibration characteristics of the sandwich panel. Based on the theory of high-order sandwich panel and considering the coupling effect of gradient porous core density and elastic modulus, the vibration equation of the composite surface-metal gradient porous sandwich panel was established. Three kinds of gradient core were analyzed: unidirectional distribution, positive gradient symmetry distribution and negative gradient symmetry distribution on the natural frequency of the sandwich panel. Finally, the vibration of the three kinds of gradient sandwich panels under the same triangular pulse load was discussed response. The calculation results show that the natural frequency of the sandwich plate with symmetrical distribution of gradient core density is larger than the natural frequency of the sandwich plate with one-way distribution.