Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"Acoustic emissions (AE)"”.
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Some rock mechanics problems with application for hydraulic fracturing
… piezoelectric transducers were used to measure acoustic emissions (AE) generated during HF and fault slip.
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Detection of fiber fracture in Unidirectional Fiber Reinforced Composites using an In-Plane Fiber Optic Sensor
… a fiber optic sensor for use in detecting acoustic emissions (AE) in FRP. The results of AE analysis (signal amplitude, frequency spectra, MARSE, and in-plane displacement) caused by simulated fiber fracture experiments and other types of mechanical loading in FRP test coupons are reported. …
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Optical fiber detection of ultrasonic vibration and acoustic emission
… the study is to develop a sensor for detecting acoustic emissions (AE) inside composite structures. The basics of wave propagation inside of materials has been presented along with an overview of typical acoustic emission testing. Surface acoustic waves (SAWs) were studied first and a novel, …
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Acoustic emissions in hydraulic fracturing of Barre granite
The purpose of this work is to observe acoustic emissions (AE) generated by laboratory scale hydraulic fracturing of Barre granite specimens with single or double flaw geometry. The scope of this work covers the experimental setup and subsequent analyses of these acoustic emissions, which in …
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Using the Finite Discrete Element Method (FDEM) to Correlate Simulated Microfractures to Acoustic Emissions in Brittle Anisotropic Rock
… methods. These include the recording of Acoustic Emissions (AE) during laboratory tests which are elastic vibrations emitted when microcracks form and/or propagate, and numerical simulation using the combined Finite-Discrete Element Method (FDEM). This research applies both laboratory and …
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Deep learning framework bridges lab and field scale microseismic focal mechanism
… huge potential for reductions in greenhouse gas emissions and thus mitigate climate change. However, these systems are extremely challenging to design and operate owing to the limited knowledge on variable geological conditions. Moreover, it has raised public concern that these systems can induce …
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Mechanisms of Interaction Between Hydraulic and Natural Fractures in Shale Rocks
… high-resolution imaging, high-speed video, acoustic emissions (AE), and pressure tracking, were employed to capture the fracturing process in real-time. Three dominant interaction modes (Crossing, Arrest, and Opening) were systematically characterized and linked to key parameters, including …
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The generation mechanisms of acoustic emission in metal cutting
… of the ultrasonic vibrations, commonly called acoustic emissions (AE), detected during the course of metal cutting, since, although quite a lot of research effort has been put into the use of AE to monitor metal cutting condition, the mechanism by which AE is generated is still not fully …
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Analysis of wave propagation in pipeline and plate-like structures for surface and interface condition assessment.
… each approach has its own limitations. Acoustic emission (AE) is a non-destructive testing and monitoring technique capable of detecting structural failure and degradation. The AE technique involves monitoring elastic waves and strain energy released by localised sources within a …