scholarly journals Acoustic emission and microslip precursors to stick-slip failure in sheared granular material

2013 ◽  
Vol 40 (21) ◽  
pp. 5627-5631 ◽  
Author(s):  
P. A. Johnson ◽  
B. Ferdowsi ◽  
B. M. Kaproth ◽  
M. Scuderi ◽  
M. Griffa ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Granular Material ◽  
Stick Slip

Influence of the Structure of a Gouge-Filled Fault on the Parameters of Acoustic Emission

2019 ◽  
Vol 105 (5) ◽  
pp. 759-765 ◽  
Author(s):  
Alexey A. Ostapchuk ◽  
Kseniya G. Morozova ◽  
Dmitry V. Pavlov
Keyword(s):  
Acoustic Emission ◽  
Laboratory Experiments ◽  
Shear Crack ◽  
Kinematic Parameters ◽  
Stick Slip ◽  
Omori Law ◽  
Shear Loads ◽  
Initial Stage ◽  
Slip Event ◽  
Model Setup

Presented are the results of laboratory experiments on investigating manifestations of acoustic emission (AE) of a gouge-filled fault during stick-slip. The laboratory experiments were held at the slider-model setup, when a granite block slides along a rough granite base under normal and shear loads. In the course of experiments we altered the structure of the two-component filler of the fault and focused on variations of the AE parameters. The kinematic parameters of fault slip events in all the realizations remained approximately the same. The eff ect of gouge structure on the statistics of AE has been revealed. An alteration of proportion of quartz sand / glass beads in the filler of the fault was accompanied by an alteration of the b-value of frequency-energy distribution from 0.53 to 0.85, and the p-value of Omori law from 1.00 to 2.06. Also, it has been demonstrated that the nucleation of a slip event is accompanied by an alteration of the mechanism of AE generation – at the initial stage the 'tensile crack' signals prevailed, while at the final stage – the 'shear crack' signals did. The alteration of AE genesis manifested vividly in a corresponding alteration of the emitted waveforms for all the realizations.

Seal Lubrication of an Automotive Water Pump

Tribology ◽  
2006 ◽  
Author(s):  
Massimo Antonini ◽  
Rodolfo Faglia ◽  
Carlo Remino ◽  
Marco Pedersoli
Keyword(s):  
Acoustic Emission ◽  
Theoretical Model ◽  
Working Conditions ◽  
Automotive Industry ◽  
Dynamic Instability ◽  
Mechanical Seal ◽  
Water Pump ◽  
Stick Slip ◽  
Grave Problem ◽  
Water Pumps

A noisy mechanical seal is a grave problem, especially in water pumps designed for the automotive industry. The noisiness is often caused by dynamic instability (stick-slip behavior), which occurs when the seal lubrication changes from hydrodynamic to mixed. Starting from this hypothesis, the paper shows a theoretical model that describes the interaction between the seal disks. Therefore this model correlates the acoustic emission to the working conditions of the water pump.

On the origin and evolution of electrical signals during frictional stick slip in sheared granular material

2014 ◽  
Vol 119 (5) ◽  
pp. 4253-4268 ◽  
Author(s):  
J. R. Leeman ◽  
M. M. Scuderi ◽  
C. Marone ◽  
D. M. Saffer ◽  
T. Shinbrot
Keyword(s):  
Granular Material ◽  
Stick Slip ◽  
Electrical Signals ◽  
Origin And Evolution

Investigation of acoustic emission accompanying stick-slip movement of rock samples at different stiffnesses of spring–block system

2011 ◽  
Vol 44 (7-8) ◽  
pp. 811-819 ◽  
Author(s):  
Teimuraz Matcharashvili ◽  
Tamaz Chelidze ◽  
Natalia Zhukova ◽  
Ekaterine Mepharidze
Keyword(s):  
Acoustic Emission ◽  
Stick Slip ◽  
Rock Samples ◽  
Block System

scholarly journals Off-fault damage and acoustic emission distributions during the evolution of structurally complex faults over series of stick-slip events

2014 ◽  
Vol 197 (3) ◽  
pp. 1705-1718 ◽  
Author(s):  
T. H. W. Goebel ◽  
T. W. Becker ◽  
C. G. Sammis ◽  
G. Dresen ◽  
D. Schorlemmer
Keyword(s):  
Acoustic Emission ◽  
Stick Slip

scholarly journals Analysis of energy characteristics of acoustic emission signals during uniaxial compression of geomaterial samples

2020 ◽  
Vol 196 ◽  
pp. 02004
Author(s):  
Vladimir Sychev ◽  
Leonid Bogomolov ◽  
Dmitriy Kulkov
Keyword(s):  
Acoustic Emission ◽  
Energy Distribution ◽  
Uniaxial Compression ◽  
Sampling Rate ◽  
Maximum Amplitude ◽  
Low Noise ◽  
Distribution Functions ◽  
Stick Slip ◽  
Ae Signal ◽  
Ae Signals

Acoustic emission (AE) signals were obtained during deformation by uniaxial compression of specimens of various geomaterials. Experiments on uniaxial compression were carried out on a low-noise lever setup with water leakage, where the maximum load on the sample does not exceed 250 kN. The received signals were digitized by an 8-channel USB 3000 ADC unit with a width of 14 bits and a maximum sampling rate of 3 MHz. The energy distribution functions of AE signals are considered. The maximum amplitude of the AE waveform was selected as the energy characteristic of the AE signal. The flow of AE events is considered from the viewpoint of nonequilibrium thermodynamics using the Tsallis statistics. To describe the energy distribution function of the AE signals, we used a modified model of a stick-slip earthquake source -”discontinuous sliding” of two plates over each other along a fault in the presence of friction and the principle of maximum entropy. The model is used to quantify long-range correlations arising in the flow of earthquakes. It is shown that the AE signal flow is a system with memory and longrange correlations. The analysis of the behavior of the Tsallis parameter was carried out throughout the experiment.

Study on Stick–Slip Friction of Reciprocating O-Ring Seals Using Acoustic Emission Techniques

2012 ◽  
Vol 55 (1) ◽  
pp. 43-51 ◽  
Author(s):  
Chuanjun Liao ◽  
Shuangfu Suo ◽  
Yuming Wang ◽  
Weifeng Huang ◽  
Ying Liu
Keyword(s):  
Acoustic Emission ◽  
Stick Slip
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