Strain Rate Effect on the Mechanical Properties and Fracture Surface Roughness of Sandstone Subjected to Dynamic Direct Tension

Strain Rate Effect on the Mechanical Properties and Fracture Surface Roughness of Sandstone Subjected to Dynamic Direct Tension

Dynamic properties of rocks are extremely important in a variety of rock mechanics and rock engineering problems. The split Hopkinson tensile bar (SHTB) system is used in this paper to measure the mechanical properties of sandstone specimens under dynamic direct tension, and the full stress-strain c...

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Main Authors: Yanlong Chen, Gang Lin, Rongrong Mao, Ming Li, Xianbiao Mao, Kai Zhang
Format: Article
Language:English
Published: IEEE 2020-01-01
Series:IEEE Access
Subjects:
Dynamic properties
split Hopkinson tensile bar
direct tension
strain rate
fracture surface roughness
Online Access:https://ieeexplore.ieee.org/document/9112207/
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spelling doaj-509a72bba3094ec29b63fb46dd8285cb2021-03-30T02:58:11ZengIEEEIEEE Access2169-35362020-01-01810797710799210.1109/ACCESS.2020.30010669112207Strain Rate Effect on the Mechanical Properties and Fracture Surface Roughness of Sandstone Subjected to Dynamic Direct TensionYanlong Chen0https://orcid.org/0000-0001-6771-5201Gang Lin1https://orcid.org/0000-0003-0288-5773Rongrong Mao2https://orcid.org/0000-0002-9916-5811Ming Li3https://orcid.org/0000-0002-0631-1024Xianbiao Mao4https://orcid.org/0000-0002-9960-2700Kai Zhang5https://orcid.org/0000-0002-6121-3179State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, ChinaDynamic properties of rocks are extremely important in a variety of rock mechanics and rock engineering problems. The split Hopkinson tensile bar (SHTB) system is used in this paper to measure the mechanical properties of sandstone specimens under dynamic direct tension, and the full stress-strain curves of the specimens at different strain rates is obtained. The experimental results indicate that the tensile strength, the tensile modulus and the peak strain of the specimen increase almost linearly with the strain rate. The increases in the tensile strength, the tensile modulus and the peak strain reach 125 %, 37 % and 98 % respectively as the strain rate increases by 252 %. The microscopic structure characteristics of the fracture surfaces after the tensile failure of the specimens are investigated by three-dimensional scanning. The results suggest that the fracture surface roughness of the sandstone under direct tension is significantly sensitive to the strain rate. Both the roughness coefficient and the fractal dimension of the specimen increase with the strain rate. The fracture surface of the specimen changes from a relatively flat two-dimensional state to a three-dimensional state, and its relative area gradually increases. Finally, it is manifested from the aspect of energy consumption that both the energy consumed in the fracture process and the dynamic direct tensile strength enhance with the fracture surface roughness. It is believed that the investigation results can provide an important reference for the research on dynamic properties of rocks involved in experimental research and engineering practice.https://ieeexplore.ieee.org/document/9112207/Dynamic propertiessplit Hopkinson tensile bardirect tensionstrain ratefracture surface roughness
collection DOAJ
language English
format Article
sources DOAJ
author Yanlong Chen
Gang Lin
Rongrong Mao
Ming Li
Xianbiao Mao
Kai Zhang
spellingShingle Yanlong Chen
Gang Lin
Rongrong Mao
Ming Li
Xianbiao Mao
Kai Zhang
Strain Rate Effect on the Mechanical Properties and Fracture Surface Roughness of Sandstone Subjected to Dynamic Direct Tension
IEEE Access
Dynamic properties
split Hopkinson tensile bar
direct tension
strain rate
fracture surface roughness
author_facet Yanlong Chen
Gang Lin
Rongrong Mao
Ming Li
Xianbiao Mao
Kai Zhang
author_sort Yanlong Chen
title Strain Rate Effect on the Mechanical Properties and Fracture Surface Roughness of Sandstone Subjected to Dynamic Direct Tension
title_short Strain Rate Effect on the Mechanical Properties and Fracture Surface Roughness of Sandstone Subjected to Dynamic Direct Tension
title_full Strain Rate Effect on the Mechanical Properties and Fracture Surface Roughness of Sandstone Subjected to Dynamic Direct Tension
title_fullStr Strain Rate Effect on the Mechanical Properties and Fracture Surface Roughness of Sandstone Subjected to Dynamic Direct Tension
title_full_unstemmed Strain Rate Effect on the Mechanical Properties and Fracture Surface Roughness of Sandstone Subjected to Dynamic Direct Tension
title_sort strain rate effect on the mechanical properties and fracture surface roughness of sandstone subjected to dynamic direct tension
publisher IEEE
series IEEE Access
issn 2169-3536
publishDate 2020-01-01
description Dynamic properties of rocks are extremely important in a variety of rock mechanics and rock engineering problems. The split Hopkinson tensile bar (SHTB) system is used in this paper to measure the mechanical properties of sandstone specimens under dynamic direct tension, and the full stress-strain curves of the specimens at different strain rates is obtained. The experimental results indicate that the tensile strength, the tensile modulus and the peak strain of the specimen increase almost linearly with the strain rate. The increases in the tensile strength, the tensile modulus and the peak strain reach 125 %, 37 % and 98 % respectively as the strain rate increases by 252 %. The microscopic structure characteristics of the fracture surfaces after the tensile failure of the specimens are investigated by three-dimensional scanning. The results suggest that the fracture surface roughness of the sandstone under direct tension is significantly sensitive to the strain rate. Both the roughness coefficient and the fractal dimension of the specimen increase with the strain rate. The fracture surface of the specimen changes from a relatively flat two-dimensional state to a three-dimensional state, and its relative area gradually increases. Finally, it is manifested from the aspect of energy consumption that both the energy consumed in the fracture process and the dynamic direct tensile strength enhance with the fracture surface roughness. It is believed that the investigation results can provide an important reference for the research on dynamic properties of rocks involved in experimental research and engineering practice.
topic Dynamic properties
split Hopkinson tensile bar
direct tension
strain rate
fracture surface roughness
url https://ieeexplore.ieee.org/document/9112207/
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AT mingli strainrateeffectonthemechanicalpropertiesandfracturesurfaceroughnessofsandstonesubjectedtodynamicdirecttension
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AT kaizhang strainrateeffectonthemechanicalpropertiesandfracturesurfaceroughnessofsandstonesubjectedtodynamicdirecttension
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