Acoustic Emission and Guided Wave Monitoring of Fatigue Crack Growth on a Full Pipe Specimen
Continuous on-line monitoring of active and passive systems, structures and components in nuclear power plants will be critical to extending the lifetimes of nuclear power plants in the US beyond 60 years. Acoustic emission and guided ultrasonic waves are two tools for continuously monitoring passive systems, structures and components within nuclear power plants and are the focus of this study. These tools are used to monitor fatigue damage induced in a SA 312 TP304 stainless steel pipe specimen. The results of acoustic emission monitoring indicate that crack propagation signals were not directly detected. However, acoustic emission monitoring exposed crack formation prior to visual confirmation through the detection of signals caused by crack closure friction. The results of guided ultrasonic wave monitoring indicate that this technology is sensitive to the presence and size of cracks. The sensitivity and complexity of GUW signals is observed to vary with respect to signal frequency and path traveled by the guided ultrasonic wave relative to the crack orientation.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1026622
- Report Number(s):
- PNNL-SA-78266; TRN: US1105032
- Resource Relation:
- Conference: Health Monitoring of Structural and Biological Systems. Proceedings of the SPIE, March 7, 2011, San Diego, California, 7984:Paper No. 798424
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
ACOUSTICS
CLOSURES
CRACK PROPAGATION
DETECTION
FRICTION
MONITORING
MONITORS
NUCLEAR POWER PLANTS
ORIENTATION
SENSITIVITY
STAINLESS STEELS
ULTRASONIC WAVES
Acoustic Emission
guided ultrasonic waves
on-line monitoring
nuclear power plants