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Acoustic Emission - Europe PMC

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Last Updated: 03 January 2023

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Investigation of the acoustic emission and fractal characteristics of coal with varying water contents during uniaxial compression failure

In the failure and deformation processes, the effects of water on coal's mechanical characteristics and acoustic emission characteristics are to be investigated. The stress-strain curve revealed distinct stage characteristics under load, as well as consistent response AE signals of natural and saturated coal samples. For the first time, Grassberger Procaccia algorithm was used to determine the AE fractal characteristics of coal samples in various stages using phase-space theory. The AE exhibits obvious fractured patterns in continuous crack propagation stages, indicating that coal is stable. During the accelerated crack propagation process, the correlation dimension decreases rapidly, continues to decline more, and begins to climb again in the fifth stage. By monitoring the subsequent increase in the fractal dimension of the AE signals' responses to various stages of loading, it is therefore possible to predict coal and rock dynamic failures.

Source link: https://europepmc.org/article/PPR/PPR587672


Gas pressure evolution characteristics of deep true triaxial coal and gas outburst based on acoustic emission monitoring.

One of the geological accidents that seriously jeopardize coal mine production is Coal and gas outburst. A self-built true triaxial coal and gas outburst simulation unit was used to simulate the coal and gas outburst at various depths in order to investigate the origins of deep coal and gas outburst. The gas threshold for deep coal and gas outburst is lower.

Source link: https://europepmc.org/article/MED/36526820


Monitoring of surface roughness evolution during abrasive flow machining by acoustic emission

Surface roughness change during AFM has been a common concern for process monitoring, as the evolution of surface roughness is highly dependent on AFM media characteristics, such as abrasive grain size and concentration, as well as process duration. This research has shown that there is a close correlation between surface roughness and material removal in AFM with different media, including AE root-mean-square and AE fast fourier transform signals, which has been demonstrated during AFM.

Source link: https://europepmc.org/article/PPR/PPR584537


Acoustic emission characteristics and failure mode analysis under constant stress lower limit uniaxial cyclic loading and unloading of shale

With the stress level increasing under constant pressure, we investigated how mechanical damage of shale specimens based on the Kaiser effect during various uniaxial cyclic loading-unloading rates. Below 1. 0kN/s low-stress unloading has few AE jobs, according to the report, while over 1. 5 million/s high-stress unloading has many AE jobs. The Kaiser effect occurs in the linear elastic phase, while the Felicity effect occurs in the elastoplastic yield and post-failure stages.

Source link: https://europepmc.org/article/PPR/PPR579848

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions