玻璃纤维增强空心玻璃微珠/环氧树脂复合泡沫材料弹性常数分析

ANALYSIS OF ELASTIC CONSTANTS OF HOLLOW GLASS MICROSPHERE / EPOXY SYNTACTIC FOAM REINFORCED BY GLASS FIBER

空心玻璃微珠/环氧树脂复合泡沫材料中添加玻璃纤维可增强复合材料的力学性能。建立了玻璃微珠及玻璃纤维两种排列形式的复合材料有限元模型,并通过改变玻璃微珠的体积分数和壁厚比来研究复合材料的弹性模量和泊松比的变化规律及内部应力分布规律。结果表明:复合材料的弹性模量随玻璃微珠壁厚比增加而增加,随体积分数的变化规律则因壁厚比不同而表现出不同的规律;泊松比随玻璃微珠体积分数增加而降低,随壁厚比增加则出现先增加后降低的规律。采用Voigt模型和混合法则提出了复合材料沿纤维轴向的弹性模量预测公式,当微珠壁厚比小于0.2时,预测结果与数值模拟结果较为吻合。

The mechanical properties of hollow glass microsphere / epoxy syntactic foam can be reinforced by adding glass fiber. Two numerical simulation models have been established with two different hollow glass microsphere and glass fiber arrangements. The change rules between elastic constants and volume fraction,relative wall thickness and stress distribution rules are studied. It is found that the elastic modulus of composites increases with the increase of glass microsphere relative wall thickness,while the changing rules with volume fraction show different patterns in different relative wall thickness. Poisson＇s ratio decreases with volume fraction increase,but it increases before then reduce with the relative wall thickness. The elastic modulus prediction formula along the fiber axial was proposed according to Voigt model and mix law. The prediction results are close to numerical simulation results when the relative wall thickness less than 0. 2.