Open Access

ARTICLE

Effects of TGO Roughness on Indentation Response of Thermal Barrier Coatings

by Taotao Hu¹, gping Shen¹

1 MOE Key Laboratory for Strength and Vibration, School of Aerospace, Xi’an Jiaotong University,Xi ’an 710049, China
2 Corresponding author: Tel/Fax: 86-29-82660977; E-mail: sshen@mail.xjtu.edu.cn

Computers, Materials & Continua 2010, 17(1), 41-58. https://doi.org/10.3970/cmc.2010.017.041

Abstract

In this paper, an axisymmetric indentation model is set up to calculate the effects of the roughness of the thermally grown oxide (TGO) layer, which was modeled as a sinusoidal wave, on the indentation response of the thermal barrier coatings. It is found that the amplitude, wavelength, and thickness of the thermally grown oxide layer have obvious influences on the indentation response, while the effect of the indenter position can be neglected. In the top coating layer, residual stress mainly occurs below the indenter and around the nearest two peaks of the thermally grown oxide layer to the indenter. Only when the indentation depth is less than 10% of the thickness of the top coating layer, the influence of TGO roughness on the force versus displacement curves of the indentation can be ignored. Correlating this work with the experimental data from indentation test may lead to improved characterization of the mechanical properties of TBC systems.

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Keywords

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