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Study on Damage Characteristics and Failure Modes of Gypsum Rock under Dynamic Impact Load

The objective of this work was to investigate the damage characteristics and failure modes of gypsum rock under dynamic impact loading. Split Hopkinson pressure bar (SHPB) tests were performed under different strain rates. The strain rate effects on the dynamic peak strength, dynamic elastic modulus...

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Autores principales: Ge, Yongxiang, Ren, Gaofeng, Zhang, Congrui, Shi, Yihu, Zhang, Luwei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10222877/
https://www.ncbi.nlm.nih.gov/pubmed/37241338
http://dx.doi.org/10.3390/ma16103711
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author Ge, Yongxiang
Ren, Gaofeng
Zhang, Congrui
Shi, Yihu
Zhang, Luwei
author_facet Ge, Yongxiang
Ren, Gaofeng
Zhang, Congrui
Shi, Yihu
Zhang, Luwei
author_sort Ge, Yongxiang
collection PubMed
description The objective of this work was to investigate the damage characteristics and failure modes of gypsum rock under dynamic impact loading. Split Hopkinson pressure bar (SHPB) tests were performed under different strain rates. The strain rate effects on the dynamic peak strength, dynamic elastic modulus, energy density, and crushing size of gypsum rock were analyzed. A numerical model of the SHPB was established using the finite element software, ANSYS 19.0, and its reliability was verified by comparing it to laboratory test results. The results showed that the dynamic peak strength and energy consumption density of gypsum rock increased exponentially with strain rate, and the crushing size decreased exponentially with the strain rate, both findings exhibited an obvious correlation. The dynamic elastic modulus was larger than the static elastic modulus, but did not show a significant correlation. Gypsum rock fracture can be divided into crack compaction, crack initiation, crack propagation, and breaking stages, and is dominated by splitting failure. With increasing strain rate, the interaction between cracks is noticeable, and the failure mode changes from splitting to crushing failure. These results provide theoretical support for improvements of the refinement process in gypsum mines.
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spelling pubmed-102228772023-05-28 Study on Damage Characteristics and Failure Modes of Gypsum Rock under Dynamic Impact Load Ge, Yongxiang Ren, Gaofeng Zhang, Congrui Shi, Yihu Zhang, Luwei Materials (Basel) Article The objective of this work was to investigate the damage characteristics and failure modes of gypsum rock under dynamic impact loading. Split Hopkinson pressure bar (SHPB) tests were performed under different strain rates. The strain rate effects on the dynamic peak strength, dynamic elastic modulus, energy density, and crushing size of gypsum rock were analyzed. A numerical model of the SHPB was established using the finite element software, ANSYS 19.0, and its reliability was verified by comparing it to laboratory test results. The results showed that the dynamic peak strength and energy consumption density of gypsum rock increased exponentially with strain rate, and the crushing size decreased exponentially with the strain rate, both findings exhibited an obvious correlation. The dynamic elastic modulus was larger than the static elastic modulus, but did not show a significant correlation. Gypsum rock fracture can be divided into crack compaction, crack initiation, crack propagation, and breaking stages, and is dominated by splitting failure. With increasing strain rate, the interaction between cracks is noticeable, and the failure mode changes from splitting to crushing failure. These results provide theoretical support for improvements of the refinement process in gypsum mines. MDPI 2023-05-13 /pmc/articles/PMC10222877/ /pubmed/37241338 http://dx.doi.org/10.3390/ma16103711 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ge, Yongxiang
Ren, Gaofeng
Zhang, Congrui
Shi, Yihu
Zhang, Luwei
Study on Damage Characteristics and Failure Modes of Gypsum Rock under Dynamic Impact Load
title Study on Damage Characteristics and Failure Modes of Gypsum Rock under Dynamic Impact Load
title_full Study on Damage Characteristics and Failure Modes of Gypsum Rock under Dynamic Impact Load
title_fullStr Study on Damage Characteristics and Failure Modes of Gypsum Rock under Dynamic Impact Load
title_full_unstemmed Study on Damage Characteristics and Failure Modes of Gypsum Rock under Dynamic Impact Load
title_short Study on Damage Characteristics and Failure Modes of Gypsum Rock under Dynamic Impact Load
title_sort study on damage characteristics and failure modes of gypsum rock under dynamic impact load
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10222877/
https://www.ncbi.nlm.nih.gov/pubmed/37241338
http://dx.doi.org/10.3390/ma16103711
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