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设计一种以薄壁球壳作为复合材料芯子的柱胞夹芯复合材料,研究其结构承载能力和阻尼减振性能一体化的特性。进行2×2柱胞排列的柱胞夹芯复合材料准静载压缩实验和3×7柱胞排列的振动测试实验,并通过有限元模拟静载压缩实验和模态分析。结果表明:随着球壳直径的增大,发生翻转和非对称屈曲所需要的临界位移增大;压缩相同的位移,直径小的球壳压缩荷载大,不锈钢薄壁椭球壳最大应力较高,较紫铜易于屈服,其振动频率较高,结构承载能力强,阻尼减振能力强于紫铜。随着球壳壁厚的增加,承载能力逐渐增强,阻尼比呈先增后减的趋势,以直径较大的球壳为芯子的柱胞夹芯复合材料阻尼减振性能高于小直径球壳。
A thin-walled spherical shell composite core-column composite material was designed to study the structural load-bearing capacity and damping damping properties of the integration. The quasi-static compressive experiments of columnar cell sandwich composites with 2 × 2 columnar cells and the vibration test of 3 × 7 columnar cells were carried out. The static compression experiments and modal analysis were performed by finite element method. The results show that with the increase of the diameter of the spherical shell, the critical displacements required for overturning and asymmetric buckling increase. Compressing the same displacement, the smaller the diameter is, the larger the compressive load of the shell is and the larger the maximum stress of the stainless steel thin- , Easier to yield than the copper, the vibration frequency is higher, the structure carrying capacity, damping damping stronger than copper. With the increase of the thickness of the spherical shell, the bearing capacity gradually increases and the damping ratio firstly increases and then decreases. The damping performance of the cylindrical sandwich composite with the larger diameter spherical shell is higher than that of the small diameter ball shell.