Acknowledgement
Supported by : 금오공대
Journal of the Korean Society of Industry Convergence (한국산업융합학회 논문집)
- Volume 10 Issue 1
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- Pages.39-46
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- 2007
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- 1226-833X(pISSN)
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- 2765-5415(eISSN)
A Study of Small Fatigue Crack Measurement and Crack Growth Characteristics
미소균열측정과 성장특성에 관한 연구
- Lee, Jong-Hyung (School of Mechanical Engineering, KIT) ;
- So, Yoon-Sub (School of Mechanical Engineering, KIT) ;
- Kim, Yun-Gon (School of Mechanical Engineering, KIT) ;
- Lim, Chun-Kyoo (School of Mechanical Engineering, KIT) ;
- Lee, Sang-Young (Korea Polytechnic VI colleges)
- 이종형 (금오공과대학교 기계공학부) ;
- 소윤섭 (금오공과대학교 대학원 생산기계공학과) ;
- 김윤곤 (금오공과대학교 대학원 생산기계공학과) ;
- 임춘규 (금오공과대학교 대학원 생산기계공학과) ;
- 이상영 (한국폴리텍 VI대학)
- Received : 2006.10.26
- Accepted : 2007.02.23
- Published : 2007.02.28
Abstract
The objective of this paper is to examine the detection limit, growth characteristics and notch curvature radius in short crack problem. Measurement techniques such as ultrasonic method and back-face strain compliance method were adapted. The fatigue crack growth rate of the short crack is slower than that of a long crack for a notched specimen. The short crack is detected effectively by ultrasonic method. A short surface crack occurs in the middle of specimen thickness and is transient to a through crack when maximum crack depth is larger than the notch curvature radius.