scholarly journals Comparative experimental studies of acoustic emission characteristics of sandstone and mudstone under the impacts of cyclic loading and unloading

2018 ◽  
Vol 14 (8) ◽  
pp. 155014771879555 ◽  
Author(s):  
Guangming Zhao ◽  
Chao Wang ◽  
Dongxu Liang
Keyword(s):  
Acoustic Emission ◽  
Experimental Studies ◽  
Strain Curve ◽  
Peak Stress ◽  
Acoustic Emission Event ◽  
Acoustic Emission Activity ◽  
Deformation And Failure ◽  
Emission Point ◽  
Peak Energy ◽  
Emission Activity

In this article, the acoustic emission tests of uniaxial cyclic load imposed on or released from the sandstone and mudstone were carried out. The deformation and failure characteristics and the law governing the acoustic emission activity were studied. The results of the study show that (1) the variation of acoustic emission events of sandstone and mudstone is law governed and is in agreement with the tendency of stress and strain curve development. (2) The acoustic emission activity of mudstone is most active before peak stress, while sandstone is at peak stress. For the sandstone, when the number of acoustic emission events is the most active, the corresponding acoustic emission energy is not the largest. However, the peak value of acoustic emission events and the peak energy of the mudstone coincide, and the acoustic emission events get to the most intense due to the peak energy. (3) The acoustic emission activity is more severe when a load is imposed on or released from the rock. Compared to loading, the rock damage caused by unloading is even greater. (4) The acoustic emission event at the splitting point is more concentrated. The line of acoustic emission point is basically consistent with the shape of the split.

Damage Evolution Analysis of Calcareous Mudstone with Different Water Content under Uniaxial Compression

2010 ◽  
Vol 168-170 ◽  
pp. 1388-1395
Author(s):  
Ming Ji ◽  
Nong Zhang ◽  
Feng Gao
Keyword(s):  
Acoustic Emission ◽  
Water Content ◽  
Uniaxial Compression ◽  
Damage Evolution ◽  
Testing Machine ◽  
Strain Curve ◽  
Peak Stress ◽  
Damage Evolution Equation ◽  
Emission Activity ◽  
Hydraulic Servo

Uniaxial compression and acoustic emission experiments of calcareous mudstone with different water content were carried out by using microcomputer controlled electro-hydraulic servo compression testing machine control system of YAW series equipped by coal-rock acoustic and electric data acquisition system of CTA-1-type. Mchanical properties and acoustic emission law of calcareous mudstone were studied. It is concluded from experiment result that rock’s elastic modulus and compressive strength both decrease with increase water content but peak stress shows the opposite trend. It is also found that calcareous mudstone is brittleness with low water content but when water content reaches saturation, calcareous mudstone presents plastic features. Acoustic emission curve fits well with stress-strain curve: acoustic emission activity begins intensifying when stress reaches 70% of peak stress, correspondingly, acoustic emission is up to maximum at peak stress. Based on Weibull hypothesis and acoustic emission experiment, damage law of water bearing calcareous mudstone is researched and damage evolution equation with time variable is advanced.

ESTIMATION PROCEDURE FOR INFLUENCE OF HEATING RATE ON ACOUSTIC EMISSION ACTIVITY IN THE ANALYSIS OF THERMALLY STIMULATED FAILURE OF ROCKS

2018 ◽  
Vol 5 ◽  
pp. 5-25 ◽  
Author(s):  
P.A. Kaznacheev ◽  
◽  
Z.-Yu.Ya. Maibuk ◽  
A.V. Ponomarev ◽  
◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Heating Rate ◽  
Estimation Procedure ◽  
Acoustic Emission Activity ◽  
Emission Activity

Cluster analysis of acoustic emission activity within wood material: Towards a real-time monitoring of crack tip propagation

2017 ◽  
Vol 180 ◽  
pp. 254-267 ◽  
Author(s):  
Malick Diakhate ◽  
Emilio Bastidas-Arteaga ◽  
Rostand Moutou Pitti ◽  
Franck Schoefs
Keyword(s):  
Cluster Analysis ◽  
Acoustic Emission ◽  
Real Time ◽  
Crack Tip ◽  
Acoustic Emission Activity ◽  
Real Time Monitoring ◽  
Wood Material ◽  
Emission Activity

Evaluation of Crack Formation in Concrete and Basalt Specimens under Cyclic Uniaxial Load Using Acoustic Emission and Computed X-Ray Tomography

2016 ◽  
Vol 722 ◽  
pp. 247-253 ◽  
Author(s):  
Alexander N. Kravcov ◽  
Pavel Svoboda ◽  
Adam Konvalinka ◽  
Elena B. Cherepetskaya ◽  
Ivan E. Sas ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Main Crack ◽  
Crack Formation ◽  
Acoustic Emission Activity ◽  
X Ray ◽  
Stress Memory ◽  
Uniaxial Load ◽  
Computed Microtomography ◽  
Emission Activity ◽  
X Ray Computed

The paper discusses the use of acoustic emission, stress-memory effect, and X-ray computed microtomography (μST) to detect the onset of destruction of specimens of concrete and basalt which are widely used in construction. It is shown that the most informative parameter is acoustic emission activity based on which the onset of the formation of a main crack can be identified. The geometry of the crack is determined using computed X-ray tomography.

scholarly journals Acoustic Emission Activity for Characterizing Fracture of Marble under Bending

2015 ◽  
Vol 6 (1) ◽  
pp. 6 ◽  
Author(s):  
Eleni Tsangouri ◽  
Dimitrios Aggelis ◽  
Theodore Matikas ◽  
Anastasios Mpalaskas
Keyword(s):  
Acoustic Emission ◽  
Acoustic Emission Activity ◽  
Emission Activity

Acoustic emission activity during accelerated conversion of high alumina cement pastes

1977 ◽  
Vol 12 (4) ◽  
pp. 848-850 ◽  
Author(s):  
R. W. Parkinson ◽  
C. T. Peters
Keyword(s):  
Acoustic Emission ◽  
High Alumina ◽  
Acoustic Emission Activity ◽  
Cement Pastes ◽  
Alumina Cement ◽  
High Alumina Cement ◽  
Emission Activity

scholarly journals Observations of acoustic emission activity during gear defect diagnosis

2003 ◽  
Vol 36 (7) ◽  
pp. 471-477 ◽  
Author(s):  
Tim Toutountzakis ◽  
David Mba
Keyword(s):  
Acoustic Emission ◽  
Acoustic Emission Activity ◽  
Emission Activity ◽  
Defect Diagnosis
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