Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Estimation of Dynamic Stress Concentration Factor by Infrared Thermography Stress Analysis

적외선 열화상 응력측정법에 의한 동적 응력집중계수 예측

  • 최만용 (한국표준과학연구원 안전그룹) ;
  • 강기수 (한국표준과학연구원 안전그룹) ;
  • 박정학 (한국표준과학연구원 안전그룹) ;
  • 안병욱 (한밭대학교 기계공학과) ;
  • 김경석 (조선대학교 기계설계공학과)
  • Published : 2008.05.01
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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

References

  1. Choi, C. M., Yoo, H. H. and Yang, H. I., "Study on the Stress Distribution of Rotating Cantilever Beam in Transient Vibration," J. of The Korean Society for Noise and Vibration Engineering, Vol. 10, No. 2, pp. 306-311, 2000
  2. Min, S. K., Choi, M. J. and Jang, S. H., "A Study on Stress and Vibration Evaluations and Application of Piping System in Petrochemical Plant," J. of The Korean Society of Machine Tool Engineers, Vol. 11, No. 3, pp. 110-116, 2002
  3. Lee, O. S., Jeon, H. S. and Byun, K. H., "Effect of Notch Geometries on Dynamic Stress Concentration Factor," J. of The Society of Naval Architects of Korea, Vol. 35, No. 4, pp. 46-54, 1998
  4. Sim, W. J. and Lee, S. H., "Numerical Analysis of Dynamic Stress Concentrations in Axisymmetric Problems," J. of The Korean Society of Mechanical Engineers, Vol. 26, No. 11, pp. 2364-2373, 2002 https://doi.org/10.3795/KSME-A.2002.26.11.2364
  5. Choi, M. Y., Kang, K. S., Park, J. H., Kim, W. T. and Kim, K. S., "Measurement of Defects and Stress by Infrared Thermography," J. of the Korean Society for Precision Engineering, Vol. 23, No. 10, pp. 30-35, 2006
  6. Panteliou, S. D. and Dimarogonas, A. D., "Thermodynamic damping in porous materials with ellipsoidal cavities," J. of Sound and Vibration, Vol. 201, No. 5, pp. 555-565, 1997 https://doi.org/10.1006/jsvi.1996.0784
  7. Bremond, P. and Potet, P., "Lock-In Thermography: A tool to analyses and locate thermo-mechanical mechanisms in materials and structures," Thermosense XXII(Proceeding of SPIE), Vol. 4360, pp. 560-566, 2001