Acoustic Emission

Bohse, J.

doi:10.1007/978-3-642-25850-3_8

Cited by 9 publications

(11 citation statements)

References 36 publications

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“…The initial prominent AE signals were created at the start of Phase III, where these observations were realised for all bond qualities for the DCB.MM.B specimens. Bohse and Chen [13] realised this same AE events referring to boundary between Phases II and III as the 'delamination tip'. The signal amplitudes again increase towards the end of failure, supporting previous statements concerning the ductile adhesive for comparing to Senthil et al…”

Section: Ae Analysismentioning

confidence: 90%

“…dependant on the elastic region of utilised material). This can be accounted for through alteration of the rate of crosshead displacement ranging from 0.1 mm/min [6] to 2 mm/min [13]. This factor can be linked with the dimensions of the substrates, however ISO 25217:2009 [3] standards regarding Mode-I adhesive (DCB/T-DCB) testing provide appropriate guidance specifying a displacement rate range for both substrate material types; metallic = 0.1-0.5 mm/min, fibrecomposite = 1.0-5.0 mm/min.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic emission method to study fracture (Mode-I, II) and residual strength characteristics in composite-to-metal and metal-to-metal adhesively bonded joints

Droubi

Stuart

Mowat

et al. 2017

The Journal of Adhesion

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Failure behaviour of two types of adhesively bonded joints (composite-to-metal, metal-to-metal) has been studied under failure modes (Mode I: double cantilever beam (DCB) and Mode II: three-point end notch flexures (3-ENF)) using acoustic emission (AE) technique. The bonded specimens were prepared using two types of adhesive bond materials with three variations of adhesive bond quality. The effect of the presence of interfacial defects along the interface on the residual strength of the joint has also been studied. It was possible using the maximum AE amplitude method to select the AE events of mechanical significance. However, it proved difficult to propose a definitive AE trait for the mechanical phenomena occurring within specific AE event signals, for all adhesive types, bond qualities, and substrate configurations; therefore, all specimen combinations. There was a notable shift in spectral energy proportion as the AE source of mechanical significance varied along the specimen length for specimen combinations. However, it was difficult to confirm this distinctive trait for all specimen combinations due to difficulty in confirming the location and exact mechanical source. The proposed measurement technique can be useful to assess the overall structural health of a bonded system and may allow identification of defects.

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Section: Ae Analysismentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Acoustic emission method to study fracture (Mode-I, II) and residual strength characteristics in composite-to-metal and metal-to-metal adhesively bonded joints

Droubi

Stuart

Mowat

et al. 2017

The Journal of Adhesion

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“…The AE amplitude and energy were utilized for comparison between the OS and CS specimens, mainly because such factors attenuate significantly with respect to the propagation distance . Considering the attenuation problems at high frequencies, we focused mainly on the frequency bands below 400 kHz for verification of the fracture mechanism . Because our AE measurement was conducted with different experimental conditions, compared with other studies, the frequency components for a given fracture mode may also differ .…”

Section: Methodsmentioning

confidence: 99%

Effect of compaction treatment on laminated CFRP composites fabricated by vacuum‐assisted resin‐transfer molding

et al. 2015

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Carbon fiber-reinforced polymer (CFRP) composites were fabricated using ordinary and compaction setups (OS and CS, respectively) in the vacuum-assisted resin-transfer molding (VARTM) process. The mechanical properties and acoustic emission (AE) spectra of the CFRP composites were compared among fabricated samples. The CFRP plates with sequences of [130/230] 6 were sectioned to make specimens for Mode I interlaminar fracture tests and three-point bending tests. The difference between the material properties and AE characteristics of the OS and CS specimens were statistically compared using one-way analysis of variance. The OS specimens had a thicker resin layer, a higher resin fraction, larger average fracture toughness, and AE energy corresponding to the Mode I fracture, whereas the CS specimens had more macro-scale voids and higher bending strength. AE analysis showed that frequency bands in the interlaminar fracture tests corresponding to matrix-related fracture were dominant for the OS specimens, whereas those corresponding to the mixed fracture mode of the fiber and matrix fracture were dominant for the CS specimens. In the bending tests, mixed fiber-matrix fractures were dominant for the OS specimens, and fiber-related fractures were dominant for the CS specimens. In conclusion, the compaction treatment diminished interlaminar fracture toughness, due to the enhanced formation of macro-scale voids around the fiber bundles during the resin impregnation stage.

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“…low signal to noise ratio (SNR). Acoustic signal has been proved to have significantly improved SNR during fault detection (Bohse, 2013).…”

Section: Related Workmentioning

confidence: 99%

“…Since early 2000s, the method of Acoustic Emission Monitoring (AEM) has been proposed for PM applications (De Silva, 2010) and (Bohse, 2013). Acoustic Emissions (AE) in rotating machinery are transient elastic waves produced by the interactions of two media of gears/bearings in relative motions.…”

Section: Introductionmentioning

confidence: 99%

Multi-source Energy Harvesting Powered Acoustic Emission Sensing System for Rotating Machinery Condition Monitoring Applications

Wang

Ortiz²,

Wang

et al. 2013

Proceedings of the 10th International Conference on Informatics in Control, Automation and Robotics

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This study concerns with the acoustic emissions (AE) monitoring for the applications of rotating machine fault detections. The first prototype wireless AE sensor system with vibrational, thermal and light energy harvesting power supply is presented in this paper. This prototype regularly records the AE signal at 150-250KHz frequency bandwidth and compares with known gear/bearing fault patterns. The data are compressed and transmitted via Zigbee based wireless transceiver to nearby central control unit. The multiple-source energy harvester proposed in this work generates 1.56mW from 0.048g vibration energy and 3.37mW thermoelectric energy when deployed on the 62 o C metal surface of a gas compressor. This battery-less wireless AE system achieves power autonomy from environmental energy, realizing a self-powered easy-to-deploy wireless data transmitting based health monitoring solution for wide range of rotating machinery.

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Acoustic Emission

Cited by 9 publications

References 36 publications

Acoustic emission method to study fracture (Mode-I, II) and residual strength characteristics in composite-to-metal and metal-to-metal adhesively bonded joints

Acoustic emission method to study fracture (Mode-I, II) and residual strength characteristics in composite-to-metal and metal-to-metal adhesively bonded joints

Effect of compaction treatment on laminated CFRP composites fabricated by vacuum‐assisted resin‐transfer molding

Multi-source Energy Harvesting Powered Acoustic Emission Sensing System for Rotating Machinery Condition Monitoring Applications

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