Acoustic emission monitoring of pressure vessels

Pellionisz, P.; Szucs, Peter

doi:10.1016/0308-0161(93)90037-t

Cited by 7 publications

(7 citation statements)

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“…3 AE sensing is popular in structural health monitoring because of inherently provided ability to evaluate an entire structure and locate a discontinuity as it forms and propagates. 4 Numerous sensor mechanisms have been investigated for acoustic emission applications, including surface capacitive sensors, laser sensors, and piezoelectric sensors. Capacitive sensors have an incredible sensitivity range, but limited robustness due to a high sensitivity to electromagnetic noise 5 .…”

Section: Introductionmentioning

confidence: 99%

Crack propagation testing using a YCOB acoustic emission sensor

et al. 2014

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Piezoelectric crystals are popular for passive sensors, such as accelerometers and acoustic emission sensors, due to their robustness and high sensitivity. These sensors are widespread in structural health monitoring among civil and industrial structures, but there is little application in high temperature environments (e.g. > 1000°C) due to the few materials that are capable of operating at elevated temperatures. Most piezoelectric materials suffer from a loss of electric properties above temperatures in the 500-700°C range, but rare earth oxyborate crystals, such as Yttrium calcium oxyborate (YCOB), retain their piezoelectric properties above 1000 °C. Our previous research demonstrated that YCOB can be used to detect transient lamb waves via Hsu-Nielsen tests, which replicate acoustic emission waves, up to 1000°C. In this paper, YCOB piezoelectric acoustic emission sensors were tested for their ability to detect crack progression at elevated temperatures. The sensor was fabricated using a YCOB single crystal and Inconel electrodes and wires. The sensor was mounted onto a stainless steel bar substrate, which was machined to include a pre-crack notch. A dynamic load was induced on the bar with a shaker in order to force the crack to advance along the thickness of the substrate. The obtained raw data was processed and analyzed in the frequency domain and compared to the Lamb wave modes that were evaluated in previous Hsu-Nielsen testing for the substrate.

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Section: Introductionmentioning

confidence: 99%

Crack propagation testing using a YCOB acoustic emission sensor

et al. 2014

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“…Plate-like structures are widely used in a variety of fields, such as material, civil, aerospace, and other industries [1][2][3][4][5]. Confirming the health condition of these plate-like structures is a very meaningful assignment for engineers.…”

Section: Introductionmentioning

confidence: 99%

Plate-Like Structure Damage Acoustic Emission Beamforming Array Technique and Probability-Based Diagnostic Imaging Method

Li¹,

Jin²,

Feng³

2016

Non-Destructive Testing

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Abstract" novel beamforming array technique and probability-based diagnostic imaging method are proposed to determine the acoustic emission "E source in plate-like structures. The technique that differs from common beamforming array techniques, in particular a sensor network, is used instead of a linear sensor array, to highlight information on the "E source location in one coordinate system as energy distribution. To reduce the uncertainty, avoid the boundary reflection effect, and ensure the rationality of the signal superposition, a Hilbert transform-based signal processing is applied before the delay-and-sum algorithm and a probability-based diagnostic imaging method is developed for "E source localization. The finite element numerical simulation method and the pencil-lead-broken experiment on aluminum plate are also conducted, and a thin-walled cylinder pipe-like structure is also tested by the pencil-lead-broken experiment to develop the application of the proposed method in various fields. The results indicate that this method is efficient and capable of visually showing the localization results highlighted in the probability images.

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“…An AE sensor coupled to a sample undergoing dynamic changes detects a part of the elastic energy that is emitted in the form of elastic waves and gives information about the nature of changes taking place in the sample. A few examples of AE emitting phenomena relevant to structural integrity monitoring are deformation, crack growth and fracture, corrosion, leaks and cavitations in fluid systems [3][4][5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

“…As such, the acoustic emission technique has been reported for structural integrity assessment and condition monitoring of a variety of engineering components [4][5][6][7][8][9][10][11][12] . For example, acoustic emission was used to detect environmental cracking in an HF storage sphere at an early stage, without the need for frequent internal inspections [4] .…”

Section: Introductionmentioning

confidence: 99%

Condition monitoring of exchange towers of heavy water plant during hydrotesting by acoustic emission technique

Mukhopadhyay¹,

Haneef²,

Rao³

et al. 2011

Insight - Non-Destructive Testing and Condition Monitoring

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AEThis paper presents results of acoustic emission (AE) testing carried out during hydrotesting of cold and hot exchange towers of a heavy water plant. Point type defect indications were observed in certain locations during ultrasonic inspection of the exchange towers. Acoustic emission monitoring during hydrotesting was carried out to determine the nature of these defects, ie whether these defects are growing or not. The cold and the hot towers were pressurised to a maximum pressure of 26.5 kg/cm 2 and 27.8 kg/cm 2 , respectively, with holds at different pressures. Acoustic emissions were picked up using sensors placed selectively at areas of interest where ultrasonic testing showed defect-like indications and at some critical areas. AE events were observed during the first pressurisation of both the towers and were attributed to micro yielding. No significant acoustic emissions were detected from either tower during the hold periods or the repressurisation. This confirmed that there is no extraneous noise and there are no severe defects in the regions monitored by the sensor arrays and nearby regions monitored by individual sensors. The combined results from AE and ultrasonic techniques confirmed the structural integrity of different regions of the towers and supported returning the towers to service for continued operation.

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Acoustic emission monitoring of pressure vessels

Cited by 7 publications

References 0 publications

Crack propagation testing using a YCOB acoustic emission sensor

Crack propagation testing using a YCOB acoustic emission sensor

Plate-Like Structure Damage Acoustic Emission Beamforming Array Technique and Probability-Based Diagnostic Imaging Method

Condition monitoring of exchange towers of heavy water plant during hydrotesting by acoustic emission technique

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