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논문 기본 정보

자료유형
학술저널
저자정보
Shrestha Ranjit (Kongju National University) Wontae Kim (Kongju National University)
저널정보
한국비파괴검사학회 비파괴검사학회지 비파괴검사학회지 제37권 제2호
발행연도
2017.4
수록면
75 - 83 (9page)

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초록· 키워드

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In this paper, we investigate the capacity of the lock-in infrared thermography technique for the evaluation of non-uniform top layers of a silicon carbide coating with a nickel based superalloy sample. The method utilized a multilayer heat transfer model to analyze the surface temperature response. The modelling of the sample was done in ANSYS. The sample consists of three layers, namely, the metal substrate, bond coat and top coat. A sinusoidal heating at different excitation frequencies was imposed upon the top layer of the sample according to the experimental procedures. The thermal response of the excited surface was recorded, and the phase angle image was computed by Fourier transform using the image processing software, MATLAB and Thermofit Pro. The correlation between the coating thickness and phase angle was established for each excitation frequency. The most appropriate excitation frequency was found to be 0.05 Hz. The method demonstrated potential in the evaluation of coating thickness and it was successfully applied to measure the non-uniform top layers ranging from 0.05 mm to 1 mm with an accuracy of 0.000002 mm to 0.045 mm.

목차

Abstract
1. Introduction
2. Materials and methods
3. Results and discussions
4. Conclusions
References

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UCI(KEPA) : I410-ECN-0101-2018-530-000790616