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针对玻璃微珠/环氧树脂构成的胶结型颗粒复合材料提出了刚架-弹簧-阻尼模型。考虑到环氧树脂基体的阻尼特性,通过动态热机械分析,得到常温低频下环氧树脂的损耗因子,并应用于刚架-弹簧-阻尼模型。采用有限单元分析方法进行数值仿真分析,得到了玻璃微珠/环氧树脂胶结型复合材料损耗因子随玻璃微珠粒径增大的变化规律。结果表明:随着玻璃微珠粒径的增大,颗粒复合材料的刚架-弹簧-阻尼模型单元计算的损耗因子会逐渐增大,且切向损耗因子要比轴向的大;对整体材料而言,刚架-弹簧-阻尼有限元模型计算的损耗因子也会逐渐增大,其中,按照平面正四边形网格模型计算得到的损耗因子要大于平面正六边形网格模型,即颗粒复合材料的孔隙率越大,材料的损耗因子越大。仿真分析结果与实际材料的阻尼变化规律相符,这种模型是可靠的。
A rigid frame - spring - damping model was proposed for the cemented particle composites composed of glass beads / epoxy resin. Considering the damping characteristics of epoxy resin matrix, the loss factor of epoxy resin at room temperature and low frequency is obtained by dynamic thermo-mechanical analysis and applied to the frame-spring-damping model. The finite element method was used to analyze the numerical simulation. The change law of the loss factor of the glass bead / epoxy resin composite was obtained with the increase of the glass bead diameter. The results show that with the increase of the glass bead diameter, the loss factor calculated by the rigid-spring-damping model unit of the composite increases gradually and the tangential loss factor is larger than that of the axial direction. , The loss factor calculated by the finite element model of rigid frame-spring-damping increases gradually, and the loss factor calculated by the planar tetragonal mesh model is larger than the regular hexagonal mesh model, that is, the particle composite The larger the porosity, the greater the material’s loss factor. The results of simulation analysis are in accordance with the change laws of the damping of the actual material. The model is reliable.