增强纤维材料高温烧蚀-相变特性的细观研究

通过高温环境下多种纤维材料的体积烧蚀机理的分析,利用细观力学的 Eshelby等效夹杂方法研究了材料烧蚀-相变特性和高温力学性能变化规律.假设材料体积烧蚀后热解相（真空）和氧化相（空气）介质统计均匀分布,考虑了热化学反应产生的气孔与固体相介质之间的相互作用,预报了不同纤维材料弹性模量随温度、加温速率之间的变化关系,并与实验结果对照,吻合较好.

ON ABLATION AND PHASE-TRANSFORMATION PROPERTIES OF FIBER REINFORCED MATERIALS AT HIGH TEMPERATURE BY MICROMECHANICS

The present paper, according to the analysis of the ablative mechanism of thermal protective fiber reinforced materials under elevated temperature, the ablation-phase transforma-tion properties and the thermomechanical behavior of the materials are investigated by Eshelby equivalent inclusion method. The interaction among different phases by thermal chemical reaction is considered from the hypothesis of the statistical uniform distribution for the pyrolysis phases (in the vacuum environment) and oxidization phases (in the air) in the materials. The elastic modulus of different fiber reinforced materials under different temperature and heating rates are predicted. The results are in good agreement with experimental data.