Proceedings of the 2017 6th International Conference on Measurement, Instrumentation and Automation (ICMIA 2017)

Crack identification based on natural frequency of cracked small pipes

Authors
Jiuhong Jia, Xiaoyu Zheng, Zhongqiang Zhang
Corresponding Author
Jiuhong Jia
Available Online June 2017.
DOI
https://doi.org/10.2991/icmia-17.2017.6How to use a DOI?
Keywords
Small branch pipe; Natural frequency; Vibration; crack; Nuclear power plant
Abstract
The severe vibration of small branch pipes in nuclear power plants can induce fatigue destruction. Sometime fatigue destructions will result in unplanned shutdown, and even threaten the safe and stable operation of the nuclear power plant. In order to predict the remaining life and guarantee the safety of small branch pipes in succeed service, the damage identification basing on vibration frequency is studied in the present research. Cracked small pipes are modeled using the finite element software ABAQUS to analyze their vibration characteristics. The first four natural frequencies of pipes with different diameters and the same crack size are simulated and the rates of change of the natural frequencies (Shorten for FCRs) are compared. It is found that the smaller the diameter is, the more sensitive the crack is to FCRs. Then, the FCRs of the first four natural frequencies of the same pipe with different cracks are compared. The FCRs increase with the propagation of cracks. However, the curves of FCRs vibrate perpendicular to the pipe and vibration amplitudes vary with position along pipes. Therefore, it can identify crack growth, but can't locate the position of the crack by natural frequencies of small pipes. The analysis results can provide necessary theoretical basis for the identification of crack propagation in small pipes.
Open Access
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Proceedings
2017 6th International Conference on Measurement, Instrumentation and Automation (ICMIA 2017)
Part of series
Advances in Intelligent Systems Research
Publication Date
June 2017
ISBN
978-94-6252-387-6
ISSN
1951-6851
DOI
https://doi.org/10.2991/icmia-17.2017.6How to use a DOI?
Open Access
This is an open access article distributed under the CC BY-NC license.

Cite this article

TY  - CONF
AU  - Jiuhong Jia
AU  - Xiaoyu Zheng
AU  - Zhongqiang Zhang
PY  - 2017/06
DA  - 2017/06
TI  - Crack identification based on natural frequency of cracked small pipes
BT  - 2017 6th International Conference on Measurement, Instrumentation and Automation (ICMIA 2017)
PB  - Atlantis Press
SP  - 27
EP  - 30
SN  - 1951-6851
UR  - https://doi.org/10.2991/icmia-17.2017.6
DO  - https://doi.org/10.2991/icmia-17.2017.6
ID  - Jia2017/06
ER  -