摘要
为研究碳纤维环氧树脂复合材料在火灾环境下的热响应,考虑其在火灾环境下的热解过程,建立非线性热响应方程组,利用有限差分法计算分析单侧热流作用下的材料内部温度-时间历程与炭化规律。结果表明:建立的热响应方程组可以有效预测碳纤维环氧树脂的温度-时间历程,与实验值吻合较好;随着加热时间延长,炭化层范围逐渐扩大,温度趋于稳定,材料温度-深度分布由非线性转变为线性;随着深度增加,碳纤维环氧树脂复合材料温升速率减小,达到热解所需的时间更长,炭化过程变慢,且单位温度的密度变化量峰值随深度增加向低温方向移动;热解反应区中不同深度位置的材料剩余质量分数在同一温度下不同,深度越大剩余质量分数越小,炭化程度越高。
In order to study the thermal response of carbon fiber epoxy resin composites in fire,considering the pyrolysis process in fire,the nonlinear thermal response equations were established,and a finite difference method was used to calculate and analyse the material’s internal time-dependent temperature progressions and carbonization subjected to one-sided heat flux.The theoretical results from the established thermal response equations were validated against experimental data and a good agreement was observed.As the heating time increases,the carbonized layer range gradually expands,the temperature changes tend to be stable,and the distribution of material temperature with depth position is changed from nonlinear to linear.With the increment of the depth,temperature rise rate is decreased,the time of carbon fiber epoxy resin composites reaching the pyrolysis temperature is increased,the carbonization process is slowed down,and the peak change of density with temperature moves toward the low temperature with the increased depth.The residual mass fraction of materials at different depth in the pyrolysis reaction zone is slightly different at the same temperature,the residual mass fraction is decreased and the degree of carbonization is increased as the depth increases.
作者
李翰
樊茂华
王纳斯丹
范保鑫
冯振宇
LI Han;FAN Mao-hua;WANG Na-si-dan;FAN Bao-xin;FENG Zhen-yu(College of Airworthiness,Civil Aviation University of China,Tianjin 300300,China;Key Laboratory of Civil Aircraft Airworthiness Technology,CAAC,Tianjin 300300,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2020年第5期49-55,共7页
Journal of Materials Engineering
基金
中央高校基本科研业务费(3122017089)。
关键词
碳纤维/环氧树脂
热响应
炭化
热分解
carbon fiber/epoxy resin
thermal response
carbonization
thermal decomposition
