Fatigue Crack Propagation Behavior and Degradation Characteristics of STS316L by Nondestructive Evaluation

Abstract:

Structural health monitoring (SHM) is a new technology that has been increasingly evaluated by the industry as a potential approach to improve the cost and ease of structural inspection. Piezoelectric smart active layer (SAL) sensor was fabricated to verify the applicability of finding cracks and conducting source location in a various materials. A crack detection and source location works were done in three kinds of test condition such as aluminum plates with crack for patch type SAL sensor, a smart airplane with embedding SAL sensor, and a concrete beam with real crack for practical application. From this experimental study, the evaluation algorithm for the arrival time delay and decrease of signal amplitude was suggested in this paper. Consequently, it was found that the SAL sensor and detection algorithm developed in this study can be effectively used to detect and monitor damages in the both existing structures and new designed smart structures.

• Periodical: Key Engineering Materials (Volumes 297-300)
• Pages: 2016-2021
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.297-300.2016
• Online since: November 2005
• Authors: So Soon Park, Seok Hwan Ahn, Chang Kwon Moon, Ki Woo Nam
• Keywords: Degradation, Fatigue Crack Propagation, Non-Destructive Evaluation (NDE), Paris Equation, Stainless Steel (SS), Ultrasonic Test, Welding

References

[1] Welding and Joining Handbook (Korea Welding Society 1998).

[2] Austenite Stainless Welding Data (POSCO 2001).

[3] K. Ogawa, et al.: J. Japan Welding Society Vol. 13 (1995), p.590.

[4] K.W. Nam and Y.U. Kim: J. Ocean Engng. and Technology Vol. 15 (2001) p.87.

[5] K.W. Nam, S.S. Park, S.H. Ahn, J.Y. Do and I.D. Park: KSNT Vol. 23 (2003) p.156.

[6] K.W. Nam, S.S. Park and S.H. Ahn: J. Kor. Inst. Met. & Mater. Vol. 41 (2003) p.186.

[7] K.W. Nam, S.S. Park and S.H. Ahn: J. Ocean Engng. and Technology Vol. 17 (2003) p.47.