复合材料负泊松比结构振动和阻尼性能研究

发布时间：2018-04-24 15:41

本文选题：负泊松比结构 + 模态应变能法　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：作为新一代先进的吸能、耗能结构,负泊松比结构的力学性能得到了国内外学者的广泛关注。目前,关于该结构的设计制备、静力学性能以及冲击吸能等方面已获得大量研究成果,但对该结构的振动阻尼性能的研究仍处于起步阶段。本文基于结构阻尼一体化思想,设计了复合材料双箭头和内凹蜂窝两种负泊松比结构和混杂复合材料负泊松比波纹夹芯板结构,通过数值模拟与实验表征的方法研究其固有振动特性与阻尼性能。主要包括以下内容。首先设计了二维双箭头与内凹蜂窝负泊松比结构,基于模态应变能法,采用数值方法研究了几何参数对结构振动与阻尼性能的影响。结果表明,结构的几何参数的变化能够有效的改变结构的固有频率与阻尼损耗因子。之后在二维结构的基础上,设计出三维双箭头与内凹蜂窝结构,研究了结构的几何参数与纤维铺层角度对固有频率与阻尼损耗因子的影响。研究发现,相对于三维内凹蜂窝结构,三维双箭头结构的固有频率对单胞角度更加敏感。最后采用共固化模压成型法制备了含粘弹性阻尼层的混杂复合材料负泊松比波纹夹芯板,采用数值模拟与实验表征的方法研究其振动与阻尼性能。研究发现,相较于复合材料负泊松比波纹夹芯板,多级材料混杂复合材料在不明显改变结构刚度的同时能显著提高结构的阻尼损耗因子,降低结构共振幅值。
[Abstract]:As a new generation of advanced energy absorption, energy dissipation structure, negative Poisson ratio structure, the mechanical properties of the structure has been widely concerned by domestic and foreign scholars. At present, a great deal of research results have been obtained on the design, fabrication, statics performance and shock energy absorption of the structure, but the study on the vibration damping performance of the structure is still in its infancy. In this paper, based on the idea of structural damping integration, two kinds of negative Poisson's ratio structure and hybrid composite's negative Poisson's ratio corrugated sandwich plate structure are designed. The natural vibration characteristics and damping properties are studied by means of numerical simulation and experimental characterization. Mainly include the following content. In this paper, the negative Poisson ratio structure with double arrowhead and concave honeycomb is designed. Based on the modal strain energy method, the effect of geometric parameters on the vibration and damping performance of the structure is studied numerically. The results show that the change of geometric parameters can effectively change the natural frequency and damping loss factor of the structure. Based on the two-dimensional structure, the three-dimensional double-arrowhead and concave honeycomb structures are designed, and the effects of geometric parameters and fiber laying angle on the natural frequency and damping loss factor are studied. It is found that the natural frequency of the three-dimensional double-arrowhead structure is more sensitive to the unit cell angle than that of the three-dimensional concave honeycomb structure. Finally, the negative Poisson's ratio corrugated sandwich plate of hybrid composites with viscoelastic damping layer was prepared by co-curing molding. The vibration and damping properties of hybrid composites were studied by numerical simulation and experimental characterization. It is found that compared with the composite material with negative Poisson's ratio corrugated sandwich panel, the multistage hybrid composite can significantly increase the damping loss factor and decrease the co-amplitude of the structure without obviously changing the structural stiffness.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB33;O327

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