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基于高硅氧/酚醛复合材料体积烧蚀条件下的三维多物理场耦合控制方程,通过有限元方法预报了高硅氧/酚醛复合材料在酚醛树脂热解反应过程中的温度场、位移场、孔隙压力以及树脂残留率等热力学响应。计算结果表明:数值计算模型预报的温度场和位移场与高硅氧/酚醛复合材料高温变形实验的测量值吻合。材料热解过程中固体材料孔隙压力的峰值点出现在材料热解反应刚开始发生的区域,而弹性应力的峰值点出现在靠近材料热解层的原始材料层。
Based on the three-dimensional multiphysics coupled governing equation under the volume ablation condition of high silica / phenolic composites, the temperature field and displacement field of the high silica / phenolic composites during pyrolysis of phenolic resin were predicted by the finite element method. Pore pressure and resin residual rate and other thermodynamic response. The calculation results show that the temperature field and displacement field predicted by the numerical calculation model are in good agreement with the measured values of high temperature deformation test of high-silica / phenolic composite. The peak point of the pore pressure of the solid material during pyrolysis of the material occurs in the region where the pyrolysis of the material occurs at the beginning, and the peak point of the elastic stress appears in the layer of the raw material near the pyrolytic layer of the material.