摘要
利用Ansys有限元软件,采用纤维随机分布模型,对在环境温度t=80℃、相对湿度RH=90%条件下的芳纶纤维/环氧树脂复合材料吸湿后的水分分布进行了模拟计算,计算结果与从材料吸湿实验中所得到的结果基本一致。根据模拟计算得到的水分浓度场对复合材料内部的吸湿应力进行了研究。结果表明:有限元方法可以比较准确地模拟复合材料在湿热环境下的水分吸收过程;复合材料内的水分浓度随老化时间延长而增大,吸湿应力也随之升高,在纤维和基体界面处的应力最大,可达50 MPa以上。
By using fiber random distribution model constructed by finite element code Ansys,the computing and analysis of transient moisture distribution were carried out after moisture transports into the aramid fiber/epoxy resin composites exposed to relative humidity RH = 90% at t=80℃ condition.The difference between the computed results and the material absorption experimental results was minimal with the maximum difference being 2.7% of the weight gain.Then the analysis was carried out to study the time-varying moisture stress on the basis of obtained transient moisture distribution.The results show that finite element analysis approach can accurately simulate transient moisture transport of composites.The level of moisture stress is very high after a long-term moisture absorption in resin matrix(above 50 MPa),and the stress in the matrix region of fiber spacing is smaller and the interface between matrix and fiber is higher than that in other regions.The highest stress occurs in the interface.This high level of stress may lead to significant effects on damage and failure initiation in the cycle moisture and drying.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2010年第6期41-44,共4页
Aerospace Materials & Technology
基金
总装备部"十一五"装备预研项目(编号:51328040106)
