Damage tolerance of nanolayer grained ceramics and quantitative estimation
Damage tolerance of nanolayer grained ceramics and quantitative estimation
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DOI：
10.1179/174328406x86209
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发表时间：
2006-02
影响因子：
1.8
通讯作者：
Y. Bao;C. Hu;Y. Zhou
中科院分区：
文献类型：
--
作者：
Y. Bao;C. Hu;Y. Zhou
为满足脆性材料损伤容限评价和设计的要求，根据损伤容限和断裂力学的特点，提出了一种利用材料基本参数定量估算损伤容限的简便公式。计算结果表明，纳米级陶瓷的损伤容限比某些脆性陶瓷的损伤容限高10倍以上，而玻璃的损伤容限最低。因此，可以直接利用各种陶瓷的基本性能数据来估计其损伤容限，而不需要进行额外的试验。扫描电子显微镜观察和有限元模拟表明，层状晶化陶瓷的高损伤容限是由于晶内分层、互锁组织和裂纹偏转所致。
In order to meet increasing requirement for the evaluation and design of damage tolerance of brittle materials, a simple expression was proposed to estimate the damage tolerance quantitatively using basic material parameters, based on the features of damage tolerance and fracture mechanics. The calculated results from this equation indicated that the damage tolerance of nanolayer grained ceramics was over 10 times higher than that of some brittle ceramics, while glass has the lowest damage tolerance. Therefore, the damage tolerance of various ceramics can be estimated directly using their basic properties data without the necessity of additional tests. SEM examination and finite element simulation showed that the high damage tolerance of the layer grained ceramics was attributed to delamination in grains, interlocking microstructures and crack deflection.