Size effect on contact behavior in DEM simple shear tests

Abstract The 2–2.5 times the simulated sand diameter is widely accepted in giving reasonable DEM simulation results for geotechnical testing. However, it neglects the effect of a specimen height to maximum particle diameter ratio in a specific laboratory test, which may lead to a strong stress conce...

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Autores principales:	Yao Li, Jiaping Li, Tantan Zhu, Kuan Han
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d018a7dc1c9d4f35a1a570ff4c4d497d
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spelling	oai:doaj.org-article:d018a7dc1c9d4f35a1a570ff4c4d497d2021-12-02T17:13:16ZSize effect on contact behavior in DEM simple shear tests10.1038/s41598-021-99473-92045-2322https://doaj.org/article/d018a7dc1c9d4f35a1a570ff4c4d497d2021-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-99473-9https://doaj.org/toc/2045-2322Abstract The 2–2.5 times the simulated sand diameter is widely accepted in giving reasonable DEM simulation results for geotechnical testing. However, it neglects the effect of a specimen height to maximum particle diameter ratio in a specific laboratory test, which may lead to a strong stress concentration and flawed simulations. This study compared laboratory simple shear tests with corresponding DEM simulations with different particle sizes. The DEM model used clump rings to simulate physical rings in the test, and decreased the additional stress applied by the widely used wall-type rings. Results showed that (1) DEM models with tested particle size and twofold sand particle size (1D and 2D tests) can better capture the tested stress–strain behavior, volumetric changes, and noncoaxiality, the 4D model has an asymmetrical distribution of contact force and contact number, indicating the specimen is inhomogeneous and has a strong stress concentration. (2) a specimen height to maximum particle diameter ratio smaller than 10 (it is greater than 10 in the ASTM D6528) could provide reasonable macro-meso mechanical behaviors. Similar studies should be carried out after trial tests on determining a reasonable specimen height to maximum particle diameter ratio under the guidance of ASTM D6528.Yao LiJiaping LiTantan ZhuKuan HanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yao Li Jiaping Li Tantan Zhu Kuan Han Size effect on contact behavior in DEM simple shear tests
description	Abstract The 2–2.5 times the simulated sand diameter is widely accepted in giving reasonable DEM simulation results for geotechnical testing. However, it neglects the effect of a specimen height to maximum particle diameter ratio in a specific laboratory test, which may lead to a strong stress concentration and flawed simulations. This study compared laboratory simple shear tests with corresponding DEM simulations with different particle sizes. The DEM model used clump rings to simulate physical rings in the test, and decreased the additional stress applied by the widely used wall-type rings. Results showed that (1) DEM models with tested particle size and twofold sand particle size (1D and 2D tests) can better capture the tested stress–strain behavior, volumetric changes, and noncoaxiality, the 4D model has an asymmetrical distribution of contact force and contact number, indicating the specimen is inhomogeneous and has a strong stress concentration. (2) a specimen height to maximum particle diameter ratio smaller than 10 (it is greater than 10 in the ASTM D6528) could provide reasonable macro-meso mechanical behaviors. Similar studies should be carried out after trial tests on determining a reasonable specimen height to maximum particle diameter ratio under the guidance of ASTM D6528.
format	article
author	Yao Li Jiaping Li Tantan Zhu Kuan Han
author_facet	Yao Li Jiaping Li Tantan Zhu Kuan Han
author_sort	Yao Li
title	Size effect on contact behavior in DEM simple shear tests
title_short	Size effect on contact behavior in DEM simple shear tests
title_full	Size effect on contact behavior in DEM simple shear tests
title_fullStr	Size effect on contact behavior in DEM simple shear tests
title_full_unstemmed	Size effect on contact behavior in DEM simple shear tests
title_sort	size effect on contact behavior in dem simple shear tests
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/d018a7dc1c9d4f35a1a570ff4c4d497d
work_keys_str_mv	AT yaoli sizeeffectoncontactbehaviorindemsimplesheartests AT jiapingli sizeeffectoncontactbehaviorindemsimplesheartests AT tantanzhu sizeeffectoncontactbehaviorindemsimplesheartests AT kuanhan sizeeffectoncontactbehaviorindemsimplesheartests
_version_	1718381407823200256

Size effect on contact behavior in DEM simple shear tests

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