K-0642 自由曲げ振動によるコーティング層のヤング率推定に関する研究(S06-3 膜特性の新評価手法)(S06 コーティング材の力学特性と損傷機構)

概要

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Metallic materials used in main hot parts of recent gas turbine are subjected to thermal loading much severer than before, because the turbine inlet temperature becomes higher and higher. Application of TBC (Thermal Barrier Coating) to the surface of these hot parts is a good method to protect the base material from high temperature. On the other hand, some troubles such as cracking and delamination are being reported in electric companies. Analysis of thermal stresses is required in order to evaluate the strength of TBC. However, mechanical properties of TBC are rather difficult to evaluate. In this paper, a new approach for measuring Young's modulus of coating layer is proposed. The approach is based on the measurement of the natural frequency of composite beam under free bending vibration. It is shown that Young's modulus of the coating layer in a SUS panel with PMMA coating and a superalloy with TBC can be estimated with good accuracy.
社団法人日本機械学会の論文
2001-08-22