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Analysis on Thermoelastic Stress in the Cantilever Beam by Lock-in Thermography  

Kang, K.S. (Safety Metrology Group, Korea Research Institute of Standard and Science)
Choi, M.Y. (Safety Metrology Group, Korea Research Institute of Standard and Science)
Park, J.H. (Safety Metrology Group, Korea Research Institute of Standard and Science)
Kim, W.T. (Department of Bio-Mechanical Engineering, Kongju National University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.28, no.3, 2008 , pp. 273-278 More about this Journal
Abstract
In this paper, effects of thermoelastic stress by using lock-in thermography was measured in the cantilever beam. In experiment, a circular holed plate was applied to analyze variation of transient stress under the condition of repeated cyclic loading. And the finite element modal analysis as computational work was performed. According to the surface temperature obtained from infrared thermography, the stress of the nearby hole was predicted based on thermoelastic equation. As results, each stress distributions between 2nd and 3rd vibration mode were qualitatively and quantitatively investigated, respectively. Also, dynamic stress concentration factors according to the change of vibration amplitude were estimated for the resonance frequency.
Keywords
Lock-in Thermography; Thermoelastic Stress; Nondestructive Testing; Concentration Factor; Finite Element Modal Analysis;
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