Experimental Study on the Charge Signal Time-Frequency Characteristics during Fracture Process of Precracked Syenogranite under Uniaxial Compression
Abstract
:1. Introduction
2. Experimental Procedure
2.1. Specimen Preparation
2.2. Experimental System
3. Analyses of Experimental Results
3.1. Mechanical Characteristics for Syenogranite Exhibiting Varying Inclination Cracks
3.2. Charge-Induction Signal Variation Laws
3.3. Charge-Induction Signal Characteristics
3.3.1. Time Domain Characteristics
3.3.2. Frequency-Domain Characteristics
3.3.3. Domain of Time-Frequency Characteristics
3.4. Comprehensive Analysis
4. Discussion
5. Summary
- (1)
- The influence of crack on the strength of syenogranite is significant. The uniaxial compression strength of specimens with a crack is greatly reduced, and the strain at failure is also significantly reduced. The uniaxial compression strength of syenogranite decreases linearly with the increase of crack inclination;
- (2)
- Signals caused by charge induction that were produced in the deformation as well as fracture of intact syenogranite are more abundant than those of crack syenogranite, and the number of charge-induction signal events is more. The signal amplitude during charge induction and the correlation between the signals are different in every phase of the deformation and fracture process of syenogranite, and the influence of the crack inclination on the amplitude and the correlation is also different;
- (3)
- The location of the charge-induction signal produced by the distortion, as well as the fracture process, of syenogranite has a certain correlation with the crack inclination. Around the crack, the charge-induction signal events with high energy are numerous, and the amplitude is relatively large along the crack inclination direction;
- (4)
- In the phase of rack propagation, there are large-amplitude, medium-correlation, and even high-correlation signals associated with charge induction, which can give an early warning of the deformation failure of the syenogranite. In the instability-failure phase, when the large-amplitude and high-correlation signals associated with charge induction are generated, it means that the syenogranite has entered the instability-failure phase and has a high risk;
- (5)
- From the elastic linear-deformation phase to the instability-failure phase, the amplitude and power values of the signals associated with charge induction gradually increase in every frequency band and reach the maximum value in the instability-failure phase. In the instability-failure phase, the charge-induction signal frequency band is distributed in 0–400 Hz, which is different from the other two phases, and the main frequencies are 10–15 Hz. With the increase of the crack inclination, the power of the charge-induction signal increases.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Liu, Y.; Ding, L.; Zhao, Y. Experimental Study on the Charge Signal Time-Frequency Characteristics during Fracture Process of Precracked Syenogranite under Uniaxial Compression. Sustainability 2023, 15, 9482. https://doi.org/10.3390/su15129482
Liu Y, Ding L, Zhao Y. Experimental Study on the Charge Signal Time-Frequency Characteristics during Fracture Process of Precracked Syenogranite under Uniaxial Compression. Sustainability. 2023; 15(12):9482. https://doi.org/10.3390/su15129482
Chicago/Turabian StyleLiu, Yuchun, Ling Ding, and Yangfeng Zhao. 2023. "Experimental Study on the Charge Signal Time-Frequency Characteristics during Fracture Process of Precracked Syenogranite under Uniaxial Compression" Sustainability 15, no. 12: 9482. https://doi.org/10.3390/su15129482