Microscopic and Macroscopic Fragmentation Characteristics under Hypervelocity Impact Based on MD and SPH Method

This work investigates the difference in the fragmentation characteristics between the microscopic and macroscopic scales under hypervelocity impact, with the simulations of Molecular Dynamics (MD) and Smoothed Particle Hydrodynamics (SPH) method. Under low shock intensity, the model at microscopic...

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Autores principales:	Wei-Dong Wu, Jin-Ming Liu, Wei Xie, Yan Xing, Jian-Li Shao
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	fragmentation molecular dynamics Smoothed Particle Hydrodynamics aluminum Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/e21ce1d4b3c14a00a00fd74e3076e74a
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spelling	oai:doaj.org-article:e21ce1d4b3c14a00a00fd74e3076e74a2021-11-25T18:31:08ZMicroscopic and Macroscopic Fragmentation Characteristics under Hypervelocity Impact Based on MD and SPH Method10.3390/nano111129532079-4991https://doaj.org/article/e21ce1d4b3c14a00a00fd74e3076e74a2021-11-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2953https://doaj.org/toc/2079-4991This work investigates the difference in the fragmentation characteristics between the microscopic and macroscopic scales under hypervelocity impact, with the simulations of Molecular Dynamics (MD) and Smoothed Particle Hydrodynamics (SPH) method. Under low shock intensity, the model at microscopic scale exhibits good penetration resistance due to the constraint of strength and surface tension. The bullet is finally embedded into the target, rather than forming a typical debris cloud at macroscopic scale. Under high shock intensity, the occurrence of unloading melting of the sample reduces the strength of the material. The material at the microscopic scale has also been completely penetrated. However, the width of the ejecta veil and external bubble of the debris cloud are narrower. In addition, the residual velocity of bullet, crater diameter and expansion angle of the debris cloud at microscopic scale are all smaller than those at macroscopic scale, especially for low-velocity conditions. The difference can be as much as two times. These characteristics indicate that the degree of conversion of kinetic energy to internal energy at the microscopic scale is much higher than that of the macroscopic results. Furthermore, the MD simulation method can further provide details of the physical characteristics at the micro-scale. As the shock intensity increases, the local melting phenomenon becomes more pronounced, accompanied by a decrease in dislocation atoms and a corresponding increase in disordered atoms. In addition, the fraction of disordered atoms is found to increase exponentially with the increasing incident kinetic energy.Wei-Dong WuJin-Ming LiuWei XieYan XingJian-Li ShaoMDPI AGarticlefragmentationmolecular dynamicsSmoothed Particle HydrodynamicsaluminumChemistryQD1-999ENNanomaterials, Vol 11, Iss 2953, p 2953 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	fragmentation molecular dynamics Smoothed Particle Hydrodynamics aluminum Chemistry QD1-999
spellingShingle	fragmentation molecular dynamics Smoothed Particle Hydrodynamics aluminum Chemistry QD1-999 Wei-Dong Wu Jin-Ming Liu Wei Xie Yan Xing Jian-Li Shao Microscopic and Macroscopic Fragmentation Characteristics under Hypervelocity Impact Based on MD and SPH Method
description	This work investigates the difference in the fragmentation characteristics between the microscopic and macroscopic scales under hypervelocity impact, with the simulations of Molecular Dynamics (MD) and Smoothed Particle Hydrodynamics (SPH) method. Under low shock intensity, the model at microscopic scale exhibits good penetration resistance due to the constraint of strength and surface tension. The bullet is finally embedded into the target, rather than forming a typical debris cloud at macroscopic scale. Under high shock intensity, the occurrence of unloading melting of the sample reduces the strength of the material. The material at the microscopic scale has also been completely penetrated. However, the width of the ejecta veil and external bubble of the debris cloud are narrower. In addition, the residual velocity of bullet, crater diameter and expansion angle of the debris cloud at microscopic scale are all smaller than those at macroscopic scale, especially for low-velocity conditions. The difference can be as much as two times. These characteristics indicate that the degree of conversion of kinetic energy to internal energy at the microscopic scale is much higher than that of the macroscopic results. Furthermore, the MD simulation method can further provide details of the physical characteristics at the micro-scale. As the shock intensity increases, the local melting phenomenon becomes more pronounced, accompanied by a decrease in dislocation atoms and a corresponding increase in disordered atoms. In addition, the fraction of disordered atoms is found to increase exponentially with the increasing incident kinetic energy.
format	article
author	Wei-Dong Wu Jin-Ming Liu Wei Xie Yan Xing Jian-Li Shao
author_facet	Wei-Dong Wu Jin-Ming Liu Wei Xie Yan Xing Jian-Li Shao
author_sort	Wei-Dong Wu
title	Microscopic and Macroscopic Fragmentation Characteristics under Hypervelocity Impact Based on MD and SPH Method
title_short	Microscopic and Macroscopic Fragmentation Characteristics under Hypervelocity Impact Based on MD and SPH Method
title_full	Microscopic and Macroscopic Fragmentation Characteristics under Hypervelocity Impact Based on MD and SPH Method
title_fullStr	Microscopic and Macroscopic Fragmentation Characteristics under Hypervelocity Impact Based on MD and SPH Method
title_full_unstemmed	Microscopic and Macroscopic Fragmentation Characteristics under Hypervelocity Impact Based on MD and SPH Method
title_sort	microscopic and macroscopic fragmentation characteristics under hypervelocity impact based on md and sph method
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/e21ce1d4b3c14a00a00fd74e3076e74a
work_keys_str_mv	AT weidongwu microscopicandmacroscopicfragmentationcharacteristicsunderhypervelocityimpactbasedonmdandsphmethod AT jinmingliu microscopicandmacroscopicfragmentationcharacteristicsunderhypervelocityimpactbasedonmdandsphmethod AT weixie microscopicandmacroscopicfragmentationcharacteristicsunderhypervelocityimpactbasedonmdandsphmethod AT yanxing microscopicandmacroscopicfragmentationcharacteristicsunderhypervelocityimpactbasedonmdandsphmethod AT jianlishao microscopicandmacroscopicfragmentationcharacteristicsunderhypervelocityimpactbasedonmdandsphmethod
_version_	1718411050500489216

Microscopic and Macroscopic Fragmentation Characteristics under Hypervelocity Impact Based on MD and SPH Method

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