考虑界面的空心玻璃微珠/环氧树脂复合泡沫材料的力学性能仿真分析  

Simulation and Analysis of Mechanical Properties of Hollow Glass Microspheres/Epoxy Syntactic Foams with Interface

作　　者：余为[1] 张雄博 YU Wei;ZHANG Xiongbo(Key Laboratory of Mechanical Reliability for Heavy Equipments and Large Structures of Hebei Province,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]燕山大学河北省重型装备与大型结构力学可靠性重点实验室,秦皇岛066004

出　　处：《材料导报》2020年第16期16161-16166,共6页Materials Reports

摘　　要：建立了空心玻璃微珠随机分布的环氧树脂复合泡沫材料代表体元模型,采用内聚力单元模拟界面。研究了玻璃微珠相对壁厚、体积分数对复合泡沫材料应力-应变曲线和屈服强度的影响,分析了空心玻璃微珠相对壁厚不同时,复合材料中的应力分布差异;还研究了界面强度对复合泡沫材料强度和应力分布的影响。研究表明,考虑界面时的数值模拟结果与相关文献的实验数据较为符合。玻璃微珠相对壁厚存在一个约为0.06的临界值,当相对壁厚小于临界值时,复合材料的屈服强度随微珠含量增加而减小;反之,则随微珠含量增加而增加。微珠相对壁厚不同,复合材料中的应力分布差异较大。界面对复合材料强度和应力分布具有重要影响,复合材料屈服强度与弱界面含量基本呈线性相关,界面弱化会使得微珠周围基体的应力分布规律变化较大。The representative volume element(RVE)model of epoxy resin composites with random distribution of hollow glass microspheres was established.The cohesive element is used to model the behavior of interfaces in composites.The influence of the relative wall thickness and vo-lume fraction of the hollow glass microsphere on the stress-strain curves and yield strength of composites were studied by numerical simulation.The discrepancy of stress distribution in composite materials was analyzed when the relative wall thickness of glass microspheres was different.The effect of interface strength on the yield strength and stress distribution of composite foams was also investigated.The study shows that the numerical simulation results considering the interface are in good agreement with the experimental data in the relevant literature.The relative wall thickness of glass microspheres has a critical value about 0.06.When the relative wall thickness is less than the critical value,the yield strength values of composites decrease with the increase of microspheres content.On the contrary,it increases.The stress distribution in composites varies greatly with the relative wall thickness of microspheres.Interface plays an important role in the strength and stress distribution of composites.The yield strength of composites is linearly correlated with the content of weak interface.Weak interface makes the stress distribution of matrix around microspheres change greatly.

关 键 词：空心玻璃微珠 复合泡沫材料 界面 力学性能 数值模拟 

分 类 号：TB332[一般工业技术—材料科学与工程]