Dynamic tensile properties, deformation, and failure testing of impact-loaded coal samples with various water content

Abstract Disc coal samples with different water content were tested using the split Hopkinson press bar test system. Their dynamic tensile failure process was monitored via an ultra-high-speed digital image correlation system. The deformation trend and failure characteristics as a function of the wa...

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Autores principales:	Zhen Wei, Ke Yang, Xiao-Lou Chi, Xiang He, Xin-Yuan Zhao, Ji-qiang Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/16576071785245a797ecda4ec3608679
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spelling	oai:doaj.org-article:16576071785245a797ecda4ec36086792021-12-02T14:25:32ZDynamic tensile properties, deformation, and failure testing of impact-loaded coal samples with various water content10.1038/s41598-021-86610-72045-2322https://doaj.org/article/16576071785245a797ecda4ec36086792021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86610-7https://doaj.org/toc/2045-2322Abstract Disc coal samples with different water content were tested using the split Hopkinson press bar test system. Their dynamic tensile failure process was monitored via an ultra-high-speed digital image correlation system. The deformation trend and failure characteristics as a function of the water content were analyzed, and the water content effect on dynamic mechanical properties was investigated. The results demonstrated that the dynamic stress–strain curve of the coal samples consisted of four stages. As the water content increased, the coal sample brittleness degraded, while its ductility was enhanced. Quadratic polynomial functions can describe dynamic peak stress, peak strain, and loading pressure. Under different loading pressures, the dynamic peak stress exhibited a concave bending trend as the water content increased. The coal sample's dynamic tensile strength had a strong rate correlation, and the saturated coal sample exhibited the highest rate correlation. Under high-rate loading, the inertia effect and the Stefan effect of water in coal samples hinder the initiation and propagation of coal sample cracks, improving the coal sample's strength. The research results provide a basic theoretical basis for the prevention and control of rock burst in coal mines.Zhen WeiKe YangXiao-Lou ChiXiang HeXin-Yuan ZhaoJi-qiang ZhangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Zhen Wei Ke Yang Xiao-Lou Chi Xiang He Xin-Yuan Zhao Ji-qiang Zhang Dynamic tensile properties, deformation, and failure testing of impact-loaded coal samples with various water content
description	Abstract Disc coal samples with different water content were tested using the split Hopkinson press bar test system. Their dynamic tensile failure process was monitored via an ultra-high-speed digital image correlation system. The deformation trend and failure characteristics as a function of the water content were analyzed, and the water content effect on dynamic mechanical properties was investigated. The results demonstrated that the dynamic stress–strain curve of the coal samples consisted of four stages. As the water content increased, the coal sample brittleness degraded, while its ductility was enhanced. Quadratic polynomial functions can describe dynamic peak stress, peak strain, and loading pressure. Under different loading pressures, the dynamic peak stress exhibited a concave bending trend as the water content increased. The coal sample's dynamic tensile strength had a strong rate correlation, and the saturated coal sample exhibited the highest rate correlation. Under high-rate loading, the inertia effect and the Stefan effect of water in coal samples hinder the initiation and propagation of coal sample cracks, improving the coal sample's strength. The research results provide a basic theoretical basis for the prevention and control of rock burst in coal mines.
format	article
author	Zhen Wei Ke Yang Xiao-Lou Chi Xiang He Xin-Yuan Zhao Ji-qiang Zhang
author_facet	Zhen Wei Ke Yang Xiao-Lou Chi Xiang He Xin-Yuan Zhao Ji-qiang Zhang
author_sort	Zhen Wei
title	Dynamic tensile properties, deformation, and failure testing of impact-loaded coal samples with various water content
title_short	Dynamic tensile properties, deformation, and failure testing of impact-loaded coal samples with various water content
title_full	Dynamic tensile properties, deformation, and failure testing of impact-loaded coal samples with various water content
title_fullStr	Dynamic tensile properties, deformation, and failure testing of impact-loaded coal samples with various water content
title_full_unstemmed	Dynamic tensile properties, deformation, and failure testing of impact-loaded coal samples with various water content
title_sort	dynamic tensile properties, deformation, and failure testing of impact-loaded coal samples with various water content
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/16576071785245a797ecda4ec3608679
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_version_	1718391354827997184

Dynamic tensile properties, deformation, and failure testing of impact-loaded coal samples with various water content

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