TATB填充高聚物复合材料有效热导率数值模拟

在细观层次上将1，3，5-三氨基-2，4，6-三硝基苯（TATB）/高聚物（TATB/PBX）视为由TATB颗粒、高聚物及微孔隙组成的三相复合材料。采用蒙特卡罗方法，建立了能够反映PBX细观结构的代表体积单元（RVE）模型，该模型可以生成高聚物颗粒和微孔隙随机分布、填充物体积分数和孔隙率任意调整的有限元计算（FEM）模型。研究了TATB填充体积分数、孔隙率和分布对TATB/PBX有效热导率的影响。结果表明：TATB/PBX有效热导率随着TATB体积分数的增加而增大；在相同的TATB填充体积分数下，随着孔隙率的增大，TATB/PBX的有效热导率呈指数减小，但孔隙的空间分布对有效热导率影响不大。模拟值与实验结果具有较好的一致性，证明所建二维RVE三相有限元模型可以用来预测TATB/PBX的有效热导率。

Numerical investigation of the effective thermal conductivity of polymer composite filled by TATB

At microscopic scale, the 1, 3, 5-triamino-2, 4, 6-trinitrobenzene(TATB)/polymer bonded explosive (PBX) was regarded as a three-phase composite, consisting of TATB particles, polymer matrix and voids. Based on the microstructure of PBX, a representative volume element (RVE) model was developed by the Monte Carlo method. The finite element model (FEM) was built considering the fraction and distribution of the fillers and pores based on the RVE model. The effect of filler fraction, porosity and pore distribution on the effective thermal conduction of TATB/PBX was studied. The results show that the effective thermal conductivity of TATB/PBX increases with TATB volume fraction increasing. At the same TATB volume fraction, the increase of porosity leads to the exponentially reduction in thermal conductivity of TATB/PBX, but the pore spatial distribution has little effect. The good consistence between simulation and experimental results proves that the model can be used to predict the effective thermal conductivity of TATB/PBX by comparing the predicted and the experimental results.