Evaluation of the Accuracy of Young’s Moduli of Thermal Barrier Coatings Determined on the Basis of Composite Beam Theory
Evaluation of the Accuracy of Young’s Moduli of Thermal Barrier Coatings Determined on the Basis of Composite Beam Theory
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基于复合梁理论的热障涂层杨氏模量精度评价
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
F. Ono
中科院分区：
文献类型：
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作者：
H. Waki;A. Oikawa;Masahiko Kato;S. Takahashi;Y. Kojima;F. Ono
热障涂层的杨氏模量是热障涂层系统中材料力学参数计算的重要力学参数。在这项研究中，我们调查的准确性TBC的杨氏模量计算使用复合梁理论。通常，TBC的杨氏模量和厚度都比基板的杨氏模量和厚度低大约一个数量级。因此，根据复合梁理论计算的TBC的杨氏模量对实验误差相当敏感。为了提高组合梁法的精度，比较了利用涂层应变、基底应变或挠度的方法。通过灵敏度分析，确定了对实验误差敏感度较低的方法。此外，低灵敏度的方法的有效性进行了实验证实。
The Young’s modulus of thermal barrier coating (TBC) is an important mechanical property as it is required for calculating the parameters of material mechanics in the TBC system. In this study, we investigated the accuracy of the Young’s modulus of TBC calculated using the composite beam theory. Generally, both the Young’s modulus and the thickness of TBC are approximately one order of magnitude lower than those of the substrate. Consequently, the Young’s modulus of the TBC calculated on the basis of the composite beam theory is considerably sensitive to experimental errors. In order to improve the accuracy of the composite beam method, methods that make use of coating strain, substrate strain, or deflection were compared. The methods with low sensitivity to experimental errors were determined through sensitivity analysis. Further, the effectiveness of the methods with low sensitivity was confirmed experimentally.