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Estimation of Dynamic Stress Concentration Factor by Infrared Thermography Stress Analysis  

Choi, Man-Yong (한국표준과학연구원 안전그룹)
Kang, Ki-Soo (한국표준과학연구원 안전그룹)
Park, Jeong-Hak (한국표준과학연구원 안전그룹)
Ahn, Byung-Wook (한밭대학교 기계공학과)
Kim, Koung-Suk (조선대학교 기계설계공학과)
Publication Information
Journal of the Korean Society for Precision Engineering / v.25, no.5, 2008 , pp. 77-81 More about this Journal
Abstract
Structural components subjected to high frequency vibrations, such as those used in vibrating parts of gas turbine engines, are usually required to avoid resonance frequencies. Generally, the operating frequency is designed at more than resonance frequencies. When a vibrating structure starts or stops, the structure has to pass through a resonance frequency, which results in large stress concentration. This paper presents the transient thermoelastic stress analysis of vibrating cantilever beam using infrared thermography and finite element method (FEM). In FEM, stress concentration factor at the 2nd resonance vibration mode is calculated by the mode superposition method of ANSYS. In experiment, stress distributions are investigated with infrared thermography and dynamic stress concentration factor is estimated. Experimental result is agreed with FEM result within 10.6%. The advantage of this technique is a better immunity to contact problem and geometric limitation in stress analysis of small or micro structures.
Keywords
Thermoelastic stress; Infrared thermography; Dynamic stress Concentration factor; Resonance frequency;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
연도 인용수 순위
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