TOUGHENING OF A PARTICULATE-REINFORCED CERAMIC-MATRIX COMPOSITE BY THERMAL RESIDUAL-STRESS
TOUGHENING OF A PARTICULATE-REINFORCED CERAMIC-MATRIX COMPOSITE BY THERMAL RESIDUAL-STRESS
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DOI：
10.1111/j.1151-2916.1990.tb05209.x
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发表时间：
1990-05-01
影响因子：
3.9
通讯作者：
YOON, HS
中科院分区：
文献类型：
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作者：
TAYA, M;HAYASHI, S;YOON, HS
从实验和理论两方面分析了TiB2颗粒在碳化硅基体中的加入增加裂纹扩展阻力KR的细观力学机理。断口证据表明，前进的裂纹被邻近的颗粒吸引，这归因于颗粒周围的拉伸区。抵消这种影响的是基体中的压缩热残余应力，它导致复合材料的增韧。颗粒增强陶瓷基复合材料中的热残余应力场是由于复合材料从加工冷却到室温时，基体和颗粒的热膨胀系数不匹配而引起的。用实验-数值分析相结合的方法测得，复合材料在整体基体上的KR增加了77%，与分析预测的52%的增加很好地吻合。由裂纹偏转模型预测的KR增加了14%。本文还讨论了KRa与颗粒体积分数Fp和空隙体积分数Fv的关系。
The micromechanics involved in increased crack growth resistance,KR, due to the addition of TiB2particulate in a SiC matrix was analyzed both experimentally and theoretically. The fractography evidence, in which, the advancing crack was attracted to adjacent particulates, was attributed to the tensile region surrounding a particulate. Countering this effect is the compressive thermal residual stress, which results in the toughening of the composite, in the matrix. This thermal residual stress field in a particulate‐reinforced ceramic‐matrix composite is induced by the mismatch in the coefficients of thermal expansion of the matrix and the particulate when the composite is cooled from the processing to room temperature. The increase inKRof the composite over the monolithic matrix, which was measured by using a hybrid experimental‐numerical analysis, was 77%, and compared well with the analytically predicted increase of 52%. The increase inKRpredicted by the crack deflection model was 14%. Dependence ofKRon the volume fraction of particulates,fp, and of voids,fv, is also discussed.