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.
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