Finite Element Analysis of Crack Growth for Structural Health Monitoring of Mooring Chains using Ultrasonic Guided Waves and Acoustic Emission

Angulo, Ángela; Allwright, Jane; Mares, Cristinel; Gan, Tat-Hean; Soua, Slim

doi:10.1016/j.prostr.2017.07.119

Cited by 12 publications

(6 citation statements)

References 4 publications

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“…These observations are relevant if NDT techniques are intended to be applied for assessing the health of mooring lines. Both the most commonly employed underwater techniques (visual and magnetic particle inspection) [24] and the less extended (e.g., ultrasound and acoustic emission based) [7,25] are more efficient if the expected morphology of the defect is known. This holds true even if the use of algorithms combining data from different NDT methods is considered [26].…”

Section: Macroscopic Assessment Of the Hydrogen Induced Crackingmentioning

confidence: 99%

Hydrogen Embrittlement Susceptibility of R4 and R5 High-Strength Mooring Steels in Cold and Warm Seawater

Artola

Arredondo²,

Fernández-Calvo

et al. 2018

Metals

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Hydrogen embrittlement susceptibility ratios calculated from slow strain rate tensile tests have been employed to study the response of three high-strength mooring steels in cold and warm synthetic seawater. The selected nominal testing temperatures have been 3 °C and 23 °C in order to resemble sea sites of offshore platform installation interest, such as the North Sea and the Gulf of Mexico, respectively. Three scenarios have been studied for each temperature: free corrosion, cathodic protection and overprotection. An improvement on the hydrogen embrittlement tendency of the steels has been observed when working in cold conditions. This provides a new insight on the relevance of the seawater temperature as a characteristic to be taken into account for mooring line design in terms of hydrogen embrittlement assessment.

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Section: Macroscopic Assessment Of the Hydrogen Induced Crackingmentioning

confidence: 99%

Hydrogen Embrittlement Susceptibility of R4 and R5 High-Strength Mooring Steels in Cold and Warm Seawater

Artola

Arredondo²,

Fernández-Calvo

et al. 2018

Metals

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“…For a qualified estimate of the real sources of AE in the material, it is necessary to apply signal processing using suitable mathematical methods and prove detailed frequency analysis. In reference to the studies of crack growth behavior, (20,21) numerical calculation may be necessary to understand more precisely the time variation in the stress and the propagation of AE waves to eliminate the differences in experimental conditions and to extract the nature of the phenomenon for the damage of the processing tool.…”

Section: Repetitive Punching Testmentioning

confidence: 99%

“…Crack growth in welding joints of mooring chains was monitored by stress pulse propagation that was numerically analyzed to evaluate structural health. (20) Hydrogen-induced cracking in high-strength steel welded joints was evaluated. A crack initiation criterion was derived using AE and the finite element method.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Tool Fracture in Punching of Thick Steel Plate

Yamashita¹,

Murase²,

Nikawa³

2020

Sensors and Materials

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The sensing of acoustic emission (AE) is efficiently used for the detection of the crack initiation of brittle materials and defects in plastic forming and other manufacturing processes. We carried out circular hole punching tests using carbon steel S45C plates of 5 or 6 mm thickness. The objective was to capture the occurrence of cracks as a predictive phenomenon of punch fracture and their propagation during punching by using an AE sensor. The impulsive stress acting on the punch due to the sudden drop in punch force at the fracture of the plate was also measured using strain gages. This stress induced fracture at the stepped portion of the punch. The maximum tensile stress of the punch depended on the fillet radius at the stepped portion. A reciprocal punching test using both plates alternately was performed to evaluate the detection of crack initiation using an AE waveform. Features in the AE waveform due to crack initiation and the frictional behavior of the crack were captured.

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“…The active approach mainly involves active guided waves that are stimulated in the structure to understand the effect of crack growth on the wave signal. [2][3][4][5] Hu Sun et al 6 developed a novel eddy current array sensing film to quantitively monitor hole-edge crack growth in bolted joints and the good capability in tracking the crack length and depth was shown. It can also be considered as an active method.…”

Section: Introductionmentioning

confidence: 99%

A research on fatigue crack growth monitoring based on multi-sensor and data fusion

Chang

Weixi

Liu

et al. 2019

Structural Health Monitoring

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Fatigue crack propagation is one of the main problems in structural health monitoring. For the safety and operability of the metal structure, it is necessary to monitor the fatigue crack growth process of the structure in real time. In order to more accurately monitor the expansion of fatigue cracks, two kinds of sensors are used in this article: strain gauges and piezoelectric transducers. A model-based inverse finite element model algorithm is proposed to perform pattern recognition of fatigue crack length, and the fatigue crack monitoring experiment is carried out to verify the algorithm. The strain spectra of the specimen under cyclic load in the simulation and experimental crack propagation are obtained, respectively. The active lamb wave technique is also used to monitor the crack propagation. The relationship between the crack length and the lamb wave characteristic parameter is established. In order to improve the recognition accuracy of the crack propagation mode, the random forest and inverse finite element model algorithms are used to identify the crack length, and the Dempster–Shafer evidence theory is used as data fusion to integrate the conclusion of the two algorithms to make a more accountable and correct judge of the crack length. An experiment has been conducted to demonstrate the effectiveness of the method.

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Finite Element Analysis of Crack Growth for Structural Health Monitoring of Mooring Chains using Ultrasonic Guided Waves and Acoustic Emission

Cited by 12 publications

References 4 publications

Hydrogen Embrittlement Susceptibility of R4 and R5 High-Strength Mooring Steels in Cold and Warm Seawater

Hydrogen Embrittlement Susceptibility of R4 and R5 High-Strength Mooring Steels in Cold and Warm Seawater

Prediction of Tool Fracture in Punching of Thick Steel Plate

A research on fatigue crack growth monitoring based on multi-sensor and data fusion

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