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피로 균열 진전에 따른 응력확대계수 측정에 관한 연구

A Study on the Measurement of Stress Intensity Factors for the Fatigue Crack Propagation

  • 오동진 (부산대학교 공과대학 조선해양공학과) ;
  • 김명현 (부산대학교 공과대학 조선해양공학과)
  • Oh, Dong-Jin (Dept. of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Kim, Myung-Hyun (Dept. of Naval Architecture and Ocean Engineering, Pusan National University)
  • 투고 : 2012.11.07
  • 심사 : 2012.12.31
  • 발행 : 2012.12.31

초록

Fatigue cracks in structural components are the most common cause of structural failure when exposed to fatigue loading. In this respect, fatigue crack detection and structural health assessment are very important. Currently, various smart materials are used for detecting fatigue crack and measurement of SIFs(Stress Intensity Factors). So, this paper presented a measurement of SIFs using MFC(Micro Fiber Composite) sensor which is the one of the smart material. MFC sensor is more flexible, durable and reliable than other smart materials. The SIFs of Mode I(K I) as well as Mode II(K II) based on the piezoelectric constitutive law and fracture mechanics are calculated. In this study, the SIF values measured by MFC sensors are compared with the theoretical results.

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참고문헌

  1. M.H. Kim, B. Butrym, and D.J. Inman: Fatigue life Estimation of structural components using MFC sensors, An International Journal for Experimental Mechanics, 2010
  2. Fujimoto, Y: Piezoelectric sensor for stress intensity factor measurement of two dimensional cracks, Engineering Fracture Mechanics, 70(2003), 1203-1218 https://doi.org/10.1016/S0013-7944(02)00091-7
  3. Fujimoto, Y: Stress Intensity Factor Measurement of Cracks Using a Piezoelectric Element, Society for Experimental Mechanics, 44(2004), 320-325 https://doi.org/10.1007/BF02427899
  4. D.J. Oh, M.H Kim: A study of Stress Intensity Factors using Micro Fiber Composite Sensors, Journal of KWJS 29-3 (2011), 56-61 (in Korean)
  5. T.L Anderson: Fracture mechanics, CRC press
  6. Y.Murakami: Stress intensity factors handbook, The Japan Society of Materials Science, Pergamon press