Acoustic Emission Monitoring of Fatigue Crack Growth in Mooring Chains

Offshore installations are subject to perpetual fatigue loading and are usually very hard to inspect. Close visual inspection from the turret is usually too hazardous for divers and is not possible with remotely operated vehicles (ROVs) because of the limited access. Conventional nondestructive tech...

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Published inApplied sciences Vol. 9; no. 11; p. 2187
Main Authors Angulo, Ángela, Tang, Jialin, Khadimallah, Ali, Soua, Slim, Mares, Cristinel, Gan, Tat-Hean
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.06.2019
Subjects
acoustic emission
Acoustics
Bandwidths
Concrete
Corrosion
Crack initiation
Experiments
fatigue crack growth
Feasibility studies
Finite element analysis
International conferences
Metal fatigue
mooring chain
Nondestructive testing
Offshore
Sensors
Steel
Strain gauges
structural health monitoring
structural integrity
United Kingdom > UK
United States > US
Arctic region
Online AccessGet full text
ISSN2076-3417
2076-3417
DOI10.3390/app9112187

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Abstract Offshore installations are subject to perpetual fatigue loading and are usually very hard to inspect. Close visual inspection from the turret is usually too hazardous for divers and is not possible with remotely operated vehicles (ROVs) because of the limited access. Conventional nondestructive techniques (NDTs) have been used in the past to carry out inspections of mooring chains, floating production storage and offloading systems (FPSOs), and other platforms. Although these have been successful at detecting and assessing fatigue cracks, the hazardous nature of the operations calls for remote techniques that could be applied continuously to identify damage initiation and progress. The aim of the present work is to study the capabilities of acoustic emission (AE) as a monitoring tool to detect fatigue crack initiation and propagation in mooring chains. A 72-day large-scale experiment was designed for this purpose. A detailed analysis of the different AE signal time domain features was not conclusive, possibly due to the high level of noise. However, the frequency content of the AE signals offers a promising indication of fatigue crack growth.
AbstractList Offshore installations are subject to perpetual fatigue loading and are usually very hard to inspect. Close visual inspection from the turret is usually too hazardous for divers and is not possible with remotely operated vehicles (ROVs) because of the limited access. Conventional nondestructive techniques (NDTs) have been used in the past to carry out inspections of mooring chains, floating production storage and offloading systems (FPSOs), and other platforms. Although these have been successful at detecting and assessing fatigue cracks, the hazardous nature of the operations calls for remote techniques that could be applied continuously to identify damage initiation and progress. The aim of the present work is to study the capabilities of acoustic emission (AE) as a monitoring tool to detect fatigue crack initiation and propagation in mooring chains. A 72-day large-scale experiment was designed for this purpose. A detailed analysis of the different AE signal time domain features was not conclusive, possibly due to the high level of noise. However, the frequency content of the AE signals offers a promising indication of fatigue crack growth.
Author Soua, Slim
Tang, Jialin
Khadimallah, Ali
Angulo, Ángela
Mares, Cristinel
Gan, Tat-Hean
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Snippet Offshore installations are subject to perpetual fatigue loading and are usually very hard to inspect. Close visual inspection from the turret is usually too...
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StartPage 2187
SubjectTerms acoustic emission
Acoustics
Bandwidths
Concrete
Corrosion
Crack initiation
Experiments
fatigue crack growth
Feasibility studies
Finite element analysis
International conferences
Metal fatigue
mooring chain
Nondestructive testing
Offshore
Sensors
Steel
Strain gauges
structural health monitoring
structural integrity
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Title Acoustic Emission Monitoring of Fatigue Crack Growth in Mooring Chains
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