Establishment of measurement method of elastic modulus of porous coating material by instrumentation indentation test

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K05971
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: Niigata University
• Principal Investigator: OHKI Motofumi 新潟大学, 自然科学系, 准教授 (50293204)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 遮熱コーティング（TBC） / 多孔性TBC / ヤング率評価 / 計装化押込み試験 / 試験力依存性 / 圧子形状および微細組織の影響 / SEM画像からのFEMモデル化 / サブモデリング弾性応力解析

Outline of Final Research Achievements

Instrumented indentation tests were carried in the range from 0.0196 ~ 196 N on the conventional and novel porous TBC specimens. As the results, it is indicated that the dependency of testing force on measured Young’s modulus of both specimens due to their microstructures. And demonstrated that the dependency of testing force on measured Young’s modulus changed by difference of indenter’s shape, and both specimens has different dependency of testing force on measured Young’s modulus. In addition, the method of modeling two-dimensional FEM model from SEM images was developed by author and the FEM models of both TBC specimens were constructed. Elastic stress analysis was conducted by using such FEM models. The influence of typical microstructure on the distributions of stress and strain was cleared.

Free Research Field

機械材料・材料強度

Academic Significance and Societal Importance of the Research Achievements

新規多孔性TBC試験片に対する計装化押込み試験の適用は他に例がなく，従来型TBCとは異なる測定ヤング率の試験力依存性を示すこと，圧子形状の相違に伴い測定ヤング率の試験力依存性も変化すること，等の新たな知見が得られたことは本研究の有用性を示している．また，マイクロX線CT による直接的形状測定が困難なTBCのような物質に対して，簡便に実施可能なSEM画像からの二次元FEMモデル化手法を開発したことは，同様の組織的特徴を有する多孔質材料への適用等の展開が考えられることから，学術的・社会的意義を有する．