摘要
聚合物基复合材料在高温环境下会发生热解反应,伴随着热解气体的产生,在材料内部形成气体压强。本文通过对UMATHT子程序进行二次开发,展开高温环境下复合材料基质热解与热解产物扩散的数值模拟,建立了复合材料内压预报模型,实现了传热方程、阿伦尼乌斯方程、达西定律、理想气体状态方程的耦合计算,模拟了75 kW/m^(2)热流作用下玻璃纤维/乙烯基酯复合材料的内压变化。结果表明:该方法得到的压强预测值与试验值吻合较好,最大压强峰值误差约为4.68%,可有效预测玻璃纤维/乙烯基酯的内压变化趋势。各位置的压强达到峰值后开始下降,且影响因素不同。3 mm位置的压强下降受分解速率、渗透率、孔隙率共同影响;6 mm位置则是孔隙率增大与初始渗透率两者导致的;9 mm位置仅受初始渗透率的影响。
The pyrolysis reaction of polymer matrix composites will occur at high temperature.With the production of pyrolysis gas,the gas pressure will be formed in the material.In this paper,through the secondary development of UMATHT subroutine,the numerical simulation of matrix pyrolysis and pyrolysis product diffusion of composites in high temperature environment is carried out,the prediction model of internal pressure of composites is established,the coupling calculation of heat transfer equation,Arrhenius equation,Darcy's law and ideal gas state equation is realized,and the change of internal pressure of glass fiber/vinyl ester composites under 75 kW/m^(2) heat flow is simulated.The results show that the pressure prediction value obtained by this method is in good agreement with the experimental value,and the maximum pressure peak error is about 4.68%,which can effectively predict the internal pressure change trend of glass fiber/vinyl ester.The pressure at each location begins to decrease after reaching its peak,and the influencing factors are different.The pressure decreasing at the 3 mm position is affected by the decomposition rate,permeability and porosity;the 6 mm position is caused by the increase of the porosity and the initial permeability;the 9 mm position is only affected by the initial permeability.
作者
解江
袁浩然
韩雪飞
李翰
冯振宇
XIE Jiang;YUAN Haoran;HAN Xuefei;LI Han;FENG Zhenyu(School of Safety Science and Engineering,Civil Aviation University of China,Tianjin 300300,China;Key Laboratory of Civil Aviation Aircraft Airworthiness Certification Technology,Tianjin 300300,China)
出处
《复合材料科学与工程》
CAS
北大核心
2023年第5期120-128,共9页
Composites Science and Engineering
关键词
内压
热分解
玻璃纤维/乙烯基酯复合材料
热响应
重叠网格技术
internal pressure
thermal decomposition
glass fibeMvinyl ester
thermal response
overlapping grid technology
