Numerical Simulation of Thermal Response of Glass Fiber/Vinyl Ester Based on UMATHT Subroutine
FENG Zhenyu1,2, FAN Baoxin1,2, WANG Nasidan1,2, HAN Xuefei1,2, LI Han1,2, WU Jingtao3
1 College of Airworthiness, Civil Aviation University of China, Tianjin 300300, China; 2 Key Laboratory of Civil Aircraft Airworthiness Technology, CAAC, Tianjin 300300, China; 3 Aircraft Strength Research Institute of China, Xi'an 710065, China
Abstract: Aiming at the thermal response of glass fiber/vinyl ester resin composites in fire environment, the thermal response model is implemented with the UMATHT and USDFLD subroutines to conduct finite element calculation and analysis, which considers heat conduction, matrix pyrolysis and gas diffusion. The results show that the thermal response finite element model of composites can reasonably forecast the thermal response of glass fiber/vinyl ester resin laminates under one-sided heat flux. Under the heat flux of 50 kW/m2, the surface temperature and rear temperature of the material at the end of heating are 615.89 ℃ and 412.55 ℃ respectively. With the increase of heating time, the temperature field of mate-rials continues rising. The distribution of material temperature in the thickness direction gradually changes from nonlinear to linear. With the increment of the depth, the longer it takes for the material to complete the pyrolysis reaction, the lower the peak of thermal decomposition rate of the material is, the later the peak of thermal decomposition rate is, and the slower the pyrolysis reaction is. At the same temperature, with the decrease of the depth, the lower the thermal decomposition rate of the material which in the pyrolysis state is, the higher the peak of the thermal decomposition rate is, and the higher the temperature which the material reaches the peak of thermal decomposition rate is.
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2021, Vol. 35 
