Experimental Study on Wave Characteristics and Acoustic Emission Characteristics of Thermal Damaged Marble

doi:10.12068/j.issn.1005-3026.2023.02.017

Abstract

Abstract: The wave and acoustic emission characteristics，as well as the damage evolutions of marble from room temperature to 800℃ under uniaxial loading were studied. The results show that for heated marble， the volume increases and the mass and density decrease. 600℃ is the threshold temperature for mass and density changes. With the increase of temperature， the peak stress and elastic modulus initially increase then decrease， while the peak strain increases monotonically. With the increase of temperature， the P-wave and S-wave velocity decreases linearly， while the spectrum area， main frequency amplitude and amplitude decrease with a decreased decline rate. It is also found that there exists good consistence between the accumulated AE accounts and the stress-strain curve， which fully reflects the damage evolution law of marble in different stages. Under the effect of high temperature， the failure of marble specimen change from brittle failure to progressive failure， and the failure modes change from shear failure to splitting failure.

Key words: high temperature; marble; wave characteristics; acoustic emission; failure mode; microstructure

CLC Number:

TU45

JIA Peng， ZHU Peng-cheng， LI Bo， MAO Song-ze. Experimental Study on Wave Characteristics and Acoustic Emission Characteristics of Thermal Damaged Marble[J]. Journal of Northeastern University(Natural Science), 2023, 44(2): 279-288.

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