BA9916-Ⅱ/CCF300复合材料加筋板吸湿特性

为研究BA9916-II/CCF300复合材料加筋板的吸湿特性,在70℃/85%RH湿热环境中开展了吸湿实验,提出了基于厚度划分的Fick吸湿模型M_t=∑ni=1v_iG_iM_(∞i)+M_(0i)(1-G_i)],并采用质量扩散模块进行了吸湿行为的有限元仿真。结果表明:提出的基于厚度划分的Fick吸湿模型能较好地描述该型结构的吸湿行为,具有较高的分析精度;但由于复合材料加筋板在吸湿后期存在阶段吸湿现象,Fick吸湿模型在该结构吸湿行为后期的描述上存在一定偏差;有限元仿真得到的吸湿动力曲线和水浓度分布结果验证了基于厚度划分吸湿模型的合理性,更好地还原了真实的吸湿过程与水分分布情况。

BA9916-II/CCF300 Composite Stiffened Plate Hygroscopic Characteristics

In order to study the moisture absorption characteristics of BA9916-Ⅱ/CCF300 composite stiffeners,Carrying out the mois-ture absorption experiment in 70℃/85%RH hot and humid environment .Fick moisture absorption model Mt =n∑i=1viGiM∞i+M0i(1-Gi)]based on thethickness partition is put forward.The mass diffusion model is used for moisture absorption behavior of the finite ele-ment simulation .The result show that:Moisture absorption model is put forward based on the thickness of fick moisture absorption model can better describe the moisture absorption behavior of the structure of the type,the analysis is of the high precision;But as a re-sult of composite stiffened plate's staging phenomenon of moisture absorption.There is a certain deviation of Fick moisture absorption model on the structure hygroscopic behavior later described;The Hygroscopic power curve and water concentration distribution results of the finite element simulation is verified the rationality of the hygroscopic model based on thickness division ,better expressing the real process of moisture absorption and moisture distribution.