Acoustic Emission and Failure Characteristics of Shales with Different Brittleness Under AWJ Impingement

2022 ◽  
Author(s):  
Hai Qu ◽  
Xiaoguang Wu ◽  
Pengpeng Huang ◽  
Shimao Tang ◽  
Rui Wang ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Failure Characteristics

scholarly journals Research on Failure Characteristics of Concrete Three-Point Bending Beams with Preexisting Cracks in Different Positions Based on Numerical Simulation

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Liuqun Zhao ◽  
Li Zheng ◽  
Hui Qin ◽  
Tiesuo Geng ◽  
Yonggang Tan ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Bearing Capacity ◽  
Failure Modes ◽  
Failure Process ◽  
Engineering Application ◽  
Tensile Failure ◽  
Engineering Structures ◽  
Failure Characteristics ◽  
Three Point Bending ◽  
Wide Range

Concrete three-point bending beams with preexisting cracks are widely used to study the growth process of I-II mixed mode cracks. Studying the failure characteristics of preexisting cracks at different locations on concrete three-point bending beams not only has important scientific significance but also has a wide range of engineering application backgrounds in the safety assessment of engineering structures. In this paper, through several numerical experiments, the influence of preexisting cracks at different positions on the failure characteristics of concrete three-point bending beams is studied, and three typical failure modes are obtained. The failure process of the specimens with three typical failure modes is discussed in detail, and it is pointed out that the crack failure mode is tensile failure. The change trends of bearing capacity, acoustic emission quantity, and acoustic emission energy of three typical failure modes are analyzed. The maximum bearing capacity, the maximum acoustic emission quantity, and energy of three failure modes of concrete three-point bending beams generally show an increasing trend.

scholarly journals Deformation of Plasma Sprayed Thermal Barrier Coatings

1999 ◽  
Author(s):  
Ufuk Senturk ◽  
Rogerio S. Lima ◽  
Carlos R. C. Lima ◽  
Christopher C. Berndt
Keyword(s):  
Acoustic Emission ◽  
Composite System ◽  
Coating Properties ◽  
Failure Characteristics ◽  
Deformation Curves ◽  
Metallic Bond ◽  
Point Bend ◽  
Plasma Sprayed ◽  
Thermally Sprayed

The deformation behavior of thermally sprayed partially stabilized zirconia (PSZ) coatings are investigated using Hertzian indentation and four-point bend testing, with in situ acoustic emission monitoring. The experimental deformation curves, together with the corresponding acoustic emission responses and the fracture properties of the material are used in defining the deformation characteristics of the coating (ceramic overlay with metallic bond coal where applicable) and substrate composite system. Experiments are aimed in examining the influence of the bond coat and the coating properties on the form of deformation. Substrate temperature and pauses during spraying are demonstrated to strongly effect the coating properties and the resulting fracture/failure characteristics of the composite system.

scholarly journals Study on Pressure Relief Effect and Rock Failure Characteristics with Different Borehole Diameters

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Shiwei Liang ◽  
Long Zhang ◽  
Di Ge ◽  
Qiong Wang
Keyword(s):  
Acoustic Emission ◽  
Research Result ◽  
Borehole Diameter ◽  
Tunnel Construction ◽  
Emission Characteristics ◽  
Pressure Relief ◽  
Failure Characteristics ◽  
Damage And Failure ◽  
Acoustic Emission Count ◽  
Relief Effect

Rock burst is a common tunnel and mine dynamic disaster, especially for deep buried tunnels, which often leads to tunnel construction delay and even induces tunnel collapse and subsidence of strata. Rock drilling is one of the effective pressure relief methods to prevent these disasters. In order to study the influence of borehole diameter on rock mass pressure relief effect, indoor acoustic emission characteristics and numerical simulation of rock samples with different borehole diameter were studied. The research result shows that with the increase in borehole diameter, the effect of borehole pressure relief is better. Different borehole diameters do not change the overall trend of acoustic emission evolution, but it will lead to different acoustic emission count characteristics of rock damage and failure, especially the maximum acoustic emission count characteristics and corresponding strain values. The existence of drilling will lead to the failure stress of rock in advance. Moreover, the existence of drilling causes a great change in the failure mode of the specimen.

scholarly journals Study on Failure Characteristics and Acoustic Emission Characteristics of Sandstone Under Variable Angle Shear

2021 ◽  
Author(s):  
Feng Luo ◽  
Peidong Xu ◽  
Yijun Guo ◽  
Yanglong Diao ◽  
Meng Li
Keyword(s):  
Shear Stress ◽  
Acoustic Emission ◽  
Normal Stress ◽  
Failure Process ◽  
Shear Angle ◽  
Shear Cracks ◽  
Failure Characteristics ◽  
Variable Angle ◽  
Secondary Cracks ◽  
Peak Shear Stress

Abstract To study the shear damage and failure characteristics of red sandstone under different normal stress conditions, the failure process of sandstone under three different shear angles (50°, 55°, 60°) were studied by using variable angle shear test device. The shear stress-deformation curves and failure characteristics of sandstone were obtained, and the relationships between shear cracks and acoustic emission impact times, amplitude, peak frequency were established. With the increase of shear angle, the normal stress, shear stress and peak shear stress decrease gradually. The development of micro-cracks in the shear plane appear more earlier. The high frequency signal decreases significantly, which may have a significant corresponding relationship with the rock friction and shear effect. The failure mode of rock changes from plasticity to brittleness. The amplitude changes are concave, and more acoustic emission energy is released at compaction stage and plastic(failure) stage. The rock spalling mainly occur in the penetrating area of main and secondary cracks surrounding the two ends of specimen. The spalling degree was obviously weakened with the increase of shear angle. The results have important guiding value for judging and predicting the instability mechanism of rock engineering.

Failure Characteristics of Osteoporotic Vertebral Bodies Monitored by Acoustic Emission

Spine ◽  
1993 ◽  
Vol 18 (15) ◽  
pp. 2314-2320 ◽  
Author(s):  
Kazuhiro Hasegawa ◽  
H. Takahashi ◽  
Y. Koga ◽  
T. Kawashima ◽  
T. Hara ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Failure Characteristics ◽  
Vertebral Bodies

Deformation of Plasma Sprayed Thermal Barrier Coatings

2000 ◽  
Vol 122 (3) ◽  
pp. 387-392 ◽  
Author(s):  
Ufuk Senturk ◽  
Rogerio S. Lima ◽  
Carlos R. C. Lima ◽  
Christopher C. Berndt
Keyword(s):  
Acoustic Emission ◽  
Bond Coat ◽  
Composite System ◽  
Coating Properties ◽  
Failure Characteristics ◽  
Deformation Curves ◽  
Point Bend ◽  
Plasma Sprayed ◽  
Thermally Sprayed

The deformation behavior of thermally sprayed partially stabilized zirconia (PSZ) coatings are investigated using Hertzian indentation and four-point bend testing, with in situ acoustic emission monitoring. The experimental deformation curves, together with the corresponding acoustic emission responses and the fracture properties of the material are used in defining the deformation characteristics of the coating (ceramic overlay with metallic bond coat where applicable) and substrate composite system. Experiments are aimed in examining the influence of the bond coat and the coating properties on the form of deformation. Substrate temperature and pauses during spraying are demonstrated to strongly effect the coating properties and the resulting fracture/failure characteristics of the composite system. [S0742-4795(00)02503-5]

The Research of Shaoguo Tunnel Failure Characteristics of Triaxial and Acoustic Emission Characteristics

2014 ◽  
Vol 501-504 ◽  
pp. 1757-1760
Author(s):  
Yi Hai Zhang ◽  
Yuan Li ◽  
Yan Zhang
Keyword(s):  
Acoustic Emission ◽  
Failure Process ◽  
Rock Failure ◽  
Signal Acquisition ◽  
Emission Characteristics ◽  
Sound Emission ◽  
Characteristic Parameters ◽  
Failure Characteristics ◽  
Emission Signal ◽  
Rock Failure Process

This is accomplished by a variety of indoor rock mechanics experiments and experimental sound emission, taking Chengde area of Hebei Province the tunnel rock made of rock as research object to simulate various loading rock failure process. To analysis the data obtained of acoustic emission and Dynamics in the process obtaining the characteristic parameters of rock failure process in order to Monitor and Forecast. Through the three axial compression test and the process of acoustic emission signal acquisition discussed the relation between the mechanical parameters of rock acoustic emission parameters of stress. The characteristic parameters of acoustic emission signals with stress and time change through analyzing the acoustic Emission characteristics of each stage in the process of rock failure provide the basis for the prediction of rock burst.

Failure characteristics of coal-rock combined bodies based on acoustic emission signals

2022 ◽  
Vol 15 (2) ◽  
Author(s):  
Junhua Xue ◽  
Zhiheng Chen ◽  
Yanhe Li ◽  
Junyou Wang ◽  
Xiao Li
Keyword(s):  
Acoustic Emission ◽  
Failure Characteristics ◽  
Coal Rock
Sign in / Sign up

Export Citation Format

Share Document