Journal of Solid Mechanics and Materials Engineering
Online ISSN : 1880-9871
ISSN-L : 1880-9871
Correction Method of Young's Modulus Measurement for Top Coat of Thermal Barrier Coatings by Instrumented Indentation Test with Spherical Indenter
Motofumi OHKITatsuya ISHIBASHI
Author information

2010 Volume 4 Issue 2 Pages 286-293


Understanding of Young’s modulus of Thermal Barrier Coatings (TBCs) top coat is one of the important factors about improvement reliability of TBCs that is key technology of increasing thermal efficiency of gas turbine. Some measurement procedures have been proposed, but not established yet. Indentation test evaluated only hardness value before, but recently it has developed to be able to evaluate other mechanical properties such as yield strength, Young’s modulus, etc. From such background, application of indentation test for measurement of Young’s modulus of TBCs top coat is effective means. Although pyramidal indenter and calculation method regulated by ISO14577 is usually selected for measurement of Young’s modulus of TBCs top coat, author have proposed spherical indenter and calculation method based on elastic contact theory by Hertz. In this study, influence of different correcting specimens on measurement Young's modulus of TBCs top coat was discussed and it was concluded that the results of HMV500 hardness standard specimen show high uniformity on measured Young’s modulus of TBCs top coat (i.e. less load dependency).

Content from these authors
© 2010 by The Japan Society of Mechanical Engineers
Previous article Next article