Electromagnetic emission under uniaxial compression of ice: II. Analysis of the relationship between an electromagnetic signal and the dynamics of charged dislocation pile-ups

2006 ◽  
Vol 51 (1) ◽  
pp. 96-103 ◽  
Author(s):  
A. A. Shibkov ◽  
R. Yu. Kol’tsov ◽  
M. A. Zheltov
Keyword(s):  
Uniaxial Compression ◽  
Electromagnetic Emission ◽  
Electromagnetic Signal ◽  
The Relationship

Control of Defects on the Parameters of the Electromagnetic Response under Pulsed Mechanical Excitation of the Sample

2015 ◽  
Vol 1085 ◽  
pp. 316-318
Author(s):  
Petr Khorsov ◽  
Nikolay Khorsov ◽  
Vladimir Surzhikov
Keyword(s):  
Acoustic Emission ◽  
Dielectric Material ◽  
Electromagnetic Emission ◽  
Excitation Pulse ◽  
Electromagnetic Response ◽  
Electromagnetic Signal ◽  
Random Component ◽  
Dielectric Sample ◽  
Random Components ◽  
Stepwise Loading

The paper assessed the possibility of using acoustic emission from the dielectric sample during stepwise loading. The electromagnetic signal from the sample was detected by using an apparatus of mechanical repeatedly pulsed excitation of the sample at each stage of loading. It was found that the response consists of a deterministic component (due to the excitation pulse) and random components noise and acoustic emission. It were allocated random components, calculated their standard deviations. The influence of the electromagnetic emission on standard deviation of the random component of response under step load on the specimen was evaluated. It has been shown that the component of the electromagnetic emission can be an informative parameter to evaluate defectiveness of the object of a dielectric material under load.

Experimental Study on Strength of Rock Masses with Transfixion Joint under Uniaxial Compression

2013 ◽  
Vol 353-356 ◽  
pp. 856-859
Author(s):  
Lei Wang ◽  
Shi Chen Li ◽  
Jian Xin Han ◽  
Zhong Yi Zeng
Keyword(s):  
Uniaxial Compression ◽  
Testing Machine ◽  
Jointed Rock ◽  
Servo Control ◽  
Peak Strength ◽  
Rock Masses ◽  
Peak Intensity ◽  
Standard Specimens ◽  
Joint Inclination ◽  
The Relationship

The relationship between the peak strength of rock masses and joint inclination angle is closely, to study its relationship, experiment on pre-existing persistent jointed rock cylindrical standard specimens was made under uniaxial compression by high stiffness servo control testing machine, experiment found that: the residual peak intensity and peak strength are increased with the decrease of jointed and nonlinear. Analysis on the peak intensity changing with the fissure inclination using Kulun strength theory, theory analysis conclusion is consistent with the experiment, prove the conclusions of experiments and theoretical analysis all can reflect the law of rock masses with transfixion joint failure strength well.

The Dependence of the Energy-Absorption Capacity of Metal Hollow Sphere Materials on their Relative Density

2007 ◽  
Vol 340-341 ◽  
pp. 389-396
Author(s):  
T.X. Yu ◽  
D. Karagiozova ◽  
Z.Y. Gao
Keyword(s):  
Yield Strength ◽  
Relative Density ◽  
Uniaxial Compression ◽  
Hollow Sphere ◽  
Absorption Capacity ◽  
Material Density ◽  
Plateau Stress ◽  
Energy Absorbing ◽  
The Relationship ◽  
Theoretical Analyses

Experimental, numerical and theoretical analyses are carried out to obtain the relationship between the stress and relative density of metal hollow sphere (MHS) materials during their large plastic deformation in order to estimate the energy absorbing capacity of these materials under uniaxial compression. Based on a numerical parametric analysis empirical functions of the relative material density are proposed for the elastic modulus, yield strength and ‘plateau’ stress for FCC packing arrangement. Analytical stress-strain dependences are suggested for the yield strength and material strain hardening properties as functions of the relative density of MHS materials under uniaxial compression.

Tests on Effects of Loading Rate on Modulus and Strength of Sandstone

2014 ◽  
Vol 1065-1069 ◽  
pp. 214-218
Author(s):  
Chun Hui Zhang ◽  
Hong Liang Yue ◽  
Lai Gui Wang
Keyword(s):  
Compressive Strength ◽  
Linear Relationship ◽  
Uniaxial Compression ◽  
Loading Rate ◽  
Strength Degradation ◽  
Peak Strength ◽  
Exponential Relationship ◽  
Loading Rates ◽  
Average Modulus ◽  
The Relationship

For studying on the effects of loading rate on modulus and strength of sandstone, uniaxial compression experiment of the samples, from Balikun mine, was performed at different loading rates. The influence of loading rate on average modulus, uniaxial compressive strength and post-peak strength degradation angle was analyzed, and the results indicate that:: The average modulus of sandstone samples increases with loading rate increasing; the both almost obey linear relationship. The peak strength of sandstone grows with the increase of loading rate; there is an approximately exponential relationship between the two. With loading rate increasing, the post-peak strength degradation angle decreases; the relationship between the both is approximately exponential.

scholarly journals Comparative analysis of acoustic and electromagnetic emissions of rocks

2021 ◽  
Vol 929 (1) ◽  
pp. 012013
Author(s):  
V N Klyuchkin ◽  
V A Novikov ◽  
V I Okunev ◽  
V A Zeigarnik
Keyword(s):  
Comparative Analysis ◽  
Uniaxial Compression ◽  
High Stress ◽  
Electromagnetic Emission ◽  
Rock Failure ◽  
Dynamic Rupture ◽  
Block Model ◽  
Rock Samples ◽  
Electromagnetic Emissions ◽  
Electromagnetic Signals

Abstract Comparative analysis of acoustic and electromagnetic emissions recorded during the intact rock samples deformation and dynamic rupture of simulated crustal fault is presented. Specialized machines for uniaxial compression and shear tests of rock samples with identical data acquisition systems for both test cases were employed. Increase of acoustic emission was observed accompanied by significant rise of intensity and amplitude of electromagnetic signals at high stress of the rock samples under the uniaxial compression or dynamic failure in the spring-block model. Such correlation is consistent with the previous conclusions that an increase of electromagnetic emission may be considered as a rock failure precursor. Any specific characteristics of the detected electromagnetic signals to be used for prediction of impending rock failure or the earthquake fault rupture were not found. The similarity of electromagnetic signals and their spectra obtained at the press equipment and the spring-block model suggests that in both cases, the signals observed are generated by the crack formations and shear. The electromagnetic emission appeared only in dry samples. The samples saturated by water with the salinity of over 0.1% demonstrated no electromagnetic emission.

scholarly journals Research on the Surface Fractal Characteristic of the Rock with Rockburst Proneness

2016 ◽  
Vol 12 (12) ◽  
pp. 71
Author(s):  
Moxiao Li ◽  
Ying-hua Song ◽  
Guang Zhang ◽  
Jing-xi Chen
Keyword(s):  
Fractal Dimension ◽  
Uniaxial Compression ◽  
Compression Test ◽  
Uniaxial Compression Test ◽  
Fractal Method ◽  
Fractal Characteristic ◽  
Surface Fractal ◽  
Crack Morphology ◽  
Different Types ◽  
The Relationship

In order to strengthen the prediction of rockburst and inquire the relationship between the rockburst proneness of rock and its surface fractal characteristic, the surface fractal of the rock was studied by fractal method and uniaxial compression test. The change rules of surface fractal of different types of rock were compared by calculating its fractal dimension of rock before experiment and after experiment. Based on the prediction results, we found that the dimension after test is bigger than before test for four kinds of rocks. The rock with stronger rockburst proneness has more intense failure in the loading process and its crack morphology is more complex.

Research on the Surface Fractal Characteristic of the Rock with Rockburst Proneness

2016 ◽  
Vol 1 (2) ◽  
pp. 349
Author(s):  
Li Mo-xiao ◽  
Zhang Guang ◽  
Chen Jing-xi
Keyword(s):  
Fractal Dimension ◽  
Uniaxial Compression ◽  
Compression Test ◽  
Uniaxial Compression Test ◽  
Fractal Method ◽  
Fractal Characteristic ◽  
Surface Fractal ◽  
Crack Morphology ◽  
Different Types ◽  
The Relationship

<p>In order to strengthen the prediction of rockburst and inquire the relationship between the rockburst proneness of rock and its surface fractal characteristic, the surface fractal of the rock was studied by fractal method and uniaxial compression test. The change rules of surface fractal of different types of rock were compared by calculating its fractal dimension of rock before experiment and after experiment. Based on this, we found that the dimension after test is bigger than before test for four kinds of rocks. The rock with stronger rockburst proneness has more intense failure in the loading process and its crack morphology is more complex.</p>

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