【作者】 刘爽；

【导师】 余为；

【作者基本信息】 燕山大学 ， 工程力学， 2014， 硕士

【摘要】 纤维增强空心玻璃微珠/环氧树脂复合材料是一种新型的轻质多孔材料，研究空心玻璃微珠体积分数、壁厚比、玻璃纤维的体积分数对复合材料力学性能的影响，掌握其受载后的应力场分布是一项重要的基础研究工作。本文通过建立复合材料的代表体元模型，对空心玻璃微珠及玻璃纤维填充环氧树脂复合材料的力学性能进行了仿真分析，从微观层面上分析其应力场分布，结合实验结果对此类复合泡沫的力学性能进行全面研究。建立了玻璃纤维两种均匀排列形式的复合材料仿真模型，分别研究了玻璃微珠不同体积分数、壁厚比、玻璃纤维不同体积分数情况下，复合材料代表体元的VonMises应力分布、弹性模量及泊松比，并从微观层面分析了复合材料的受力机理。基于混合法则拟合得出了空心玻璃微珠及玻璃纤维填充环氧树脂复合材料弹性模量的一般性预测表达式，并将两种排列形式的模拟结果与理论预测结果进行了对比分析。然后，进一步研究了玻璃微珠体积分数、壁厚比及玻璃纤维体积分数对复合材料弹塑性性能的影响，得出了复合材料的应力-应变曲线，分析了其受载后变形规律。最后，制备了一种空心玻璃微珠质量分数、四种玻璃纤维质量分数的空心玻璃微珠及玻璃纤维填充环氧树脂复合材料，通过拉伸、压缩和弯曲实验研究了其弹性模量、屈服极限等力学性能，分析了影响此类复合材料力学性能的主要因素及原因。更多还原

【Abstract】 Epoxy resin composite material filled hollow glass microsphere and glass fiber is anew type of lightweight porous materials, to study the affection of volume fraction andwall thickness ratio of hollow glass microspheres, volume fraction of glass fiber on theperformance of composite material mechanics and master its stress field distribution afterloading is an important basic research work. In this paper, through the establishment ofrepresentative element numerical model of composite materials, the mechanicsperformance of epoxy resin composite material filled hollow glass microsphere and glassfiber was analyzed. The stress field distribution was understood from the micro level.According to the result of experiment, the mechanics performance study of this materialwas conducted comprehensively.Two arrangement forms of glass fiber of composite material simulation model wasestablished, the Von Mises stress distribution, the elastic modulus and poisson ratio ofcomposite materials on behalf of the unit cell were studied on condition of differentvolume fraction and wall thickness ratio of hollow glass microsphere and different glassfiber volume fraction, the stress mechanism of composite material was analyzed frommicro level. Based on hybrid rule, the elastic modulus’ general prediction expression ofcomposite material filled hollow glass microsphere and glass fiber was fitting concluded,and two arrangement forms of the simulation results are compared to the theoreticalpredictions. Then, to further study the influence of volume fraction and wall thicknessratio of hollow glass microsphere and glass fiber’s volume fraction on compositematerial’s elastic and plastic performance, the stress-strain curve of composite materialwas concluded, and its deformation law after loading was analyzed.Finally, a few of fiber-reinforced syntactic foams with a kind of hollow glassmicrosphere mass ratio and four kind of glass fiber mass ratio are prepared. Through aseries of compression, tensile and bending experiments, the mechanical propertiesincluding elastic modulus, yield limit and so on were studied. The main factors andreasons affecting this kind of composite material mechanics performance were analyzed.更多还原