Thermal residual strains and stresses in Al2O3/Al composites with interpenetrating networks
Thermal residual strains and stresses in Al2O3/Al composites with interpenetrating networks
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DOI：
10.1016/s1359-6454(98)00367-x
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发表时间：
1999-01-15
期刊：
影响因子：
9.4
通讯作者：
Rödel, J
中科院分区：
文献类型：
--
作者：
Hoffman, M;Skirl, S;Rödel, J
分析使用膨胀计获得的 Al2O3/Al 互穿网络复合材料的热膨胀数据，以确定室温至 600 摄氏度之间的热循环期间和之后的残余应力。采用有效介质近似方法的严格技术，利用通过实验确定的各个相的无约束热应变。热膨胀系数被预测为金属含量和温度的函数。残余应力使用两种方法计算：(1) 考虑总复合应变的“宏观”方法；(2) 考虑金属相中时间相关效应的“微观机械”方法。预测与实验数据和中子衍射测量结果非常吻合，并提供了对材料热机械行为的机械理解。 (C) 1999 Acta Metallurgica Inc. 由 Elsevier Science Ltd 出版。保留所有权利。
Thermal expansion data for Al2O3/Al interpenetrating network composites, obtained using a dilatometer, are analysed to determine the residual stress during, and after, thermal cycling between room temperature and 600 degrees C. A rigorous technique, using the effective medium approximation method, is applied, utilizing unconstrained thermal strains of the individual phases which are determined experimentally. Coefficients of thermal expansion are predicted as a function of metal content and temperature. Residual stresses are calculated using two approaches: (1) a "macroscopic" approach which considers total composite strain and (2) a "micromechanical" approach which considers time dependent effects in the metal phase. Predictions agree well with experimental data and neutron diffraction measurements, and provide a mechanistic understanding of the thermo-mechanical behaviour of the material. (C) 1999 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.