Strain Rate Effect on Acoustic Emission Characteristics and Energy Mechanisms of Karst Limestone under Uniaxial Compression
Joint Authors
Chen, Jianxun
Luo, Yanbin
Li, Yao
Guo, Jiaqi
Wang, Qingsong
Liu, Qin
Wang, Hongyu
Source
Advances in Materials Science and Engineering
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-13, 13 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-02-14
Country of Publication
Egypt
No. of Pages
13
Abstract EN
In this paper, the strain rate effect on mechanical properties, failure modes, acoustic emission (AE) characteristics, and energy mechanism of the karst limestone was analyzed based on uniaxial compression tests with different strain rates (5 × 10−6–5 × 10−4/s).
The results showed that the peak strength increased linearly and peak strain increased quadratically with the logarithm value of the strain rate.
Moreover, the strain rate effect on elastic modulus was not significant.
Under low strain rates, the rock was damaged seriously, AE signals appeared continuously, and the cumulative number of AE signals was high.
Under high strain rates, the total quantity of the macroscopic cracks decreased, but the crack length extended with better coalescence.
The AE peak significantly increased under high strain rates, while the cumulative AE activity significantly reduced.
The energy evolution of the karst limestone failure process had significant stage characteristics, and the strain energy ratio presented an S-shape.
The maximum value of the elastic strain energy at peak stress showed a linear relationship with the logarithm value of the strain rate.
American Psychological Association (APA)
Wang, Qingsong& Chen, Jianxun& Guo, Jiaqi& Luo, Yanbin& Li, Yao& Wang, Hongyu…[et al.]. 2020. Strain Rate Effect on Acoustic Emission Characteristics and Energy Mechanisms of Karst Limestone under Uniaxial Compression. Advances in Materials Science and Engineering،Vol. 2020, no. 2020, pp.1-13.
https://search.emarefa.net/detail/BIM-1128956
Modern Language Association (MLA)
Wang, Qingsong…[et al.]. Strain Rate Effect on Acoustic Emission Characteristics and Energy Mechanisms of Karst Limestone under Uniaxial Compression. Advances in Materials Science and Engineering No. 2020 (2020), pp.1-13.
https://search.emarefa.net/detail/BIM-1128956
American Medical Association (AMA)
Wang, Qingsong& Chen, Jianxun& Guo, Jiaqi& Luo, Yanbin& Li, Yao& Wang, Hongyu…[et al.]. Strain Rate Effect on Acoustic Emission Characteristics and Energy Mechanisms of Karst Limestone under Uniaxial Compression. Advances in Materials Science and Engineering. 2020. Vol. 2020, no. 2020, pp.1-13.
https://search.emarefa.net/detail/BIM-1128956
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1128956