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Energies 2018, 11(9), 2349; https://doi.org/10.3390/en11092349

The Creep-Damage Model of Salt Rock Based on Fractional Derivative

1
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, China
2
College of Engineering, Peking University, Beijing 100871, China
*
Author to whom correspondence should be addressed.
Received: 30 July 2018 / Revised: 29 August 2018 / Accepted: 29 August 2018 / Published: 6 September 2018
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Abstract

The use of salt rock for underground radioactive waste disposal facilities requires a comprehensive analysis of the creep-damage process in salt rock. A computer-controlled creep setup was employed to carry out a creep test of salt rock that lasted as long as 359 days under a constant uniaxial stress. The acoustic emission (AE) space-time evolution and energy-releasing characteristics during the creep test were studied in the meantime. A new creep-damage model is proposed on the basis of a fractional derivative by combining the AE statistical regularity. It indicates that the AE data in the non-decay creep process of salt rock can be divided into three stages. Furthermore, the authors propose a new creep-damage model of salt rock based on a fractional derivative. The parameters in the model were determined by the Quasi-Newton method. The fitting analysis suggests that the new creep-damage model provides a precise description of full creep regions in salt rock. View Full-Text
Keywords: salt rock; creep; damage; fractional derivative; acoustic emission salt rock; creep; damage; fractional derivative; acoustic emission
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zhou, H.; Liu, D.; Lei, G.; Xue, D.; Zhao, Y. The Creep-Damage Model of Salt Rock Based on Fractional Derivative. Energies 2018, 11, 2349.

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