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      Study on the influence of standoff distance on substrate damage under an abrasive water jet process by molecular dynamics simulation


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          The process of a cluster-containing water jet impinging on a monocrystalline silicon substrate was studied by molecular dynamics simulation. The results show that as the standoff distance increases, the jet will gradually diverge. As a result, the solidified water film between the cluster and the substrate becomes “thicker” and “looser”. The “thicker” and “looser” water film will then consume more input energy to achieve complete solidification, resulting in the stress region and the high-pressure region of the silicon substrate under small standoff distances to be significantly larger than those under large standoff distances. Therefore, the degree of damage sustained by the substrate will first experience a small change and then decrease quickly as the standoff distance increases. In summary, the occurrence and maintenance of complete solidification of the confined water film between the cluster and the substrate plays a decisive role in the level of damage formation on the silicon substrate. These findings are helpful for exploring the mechanism of an abrasive water jet.

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          Most cited references 33

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          Crystal data for high-pressure phases of silicon

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            Nonequilibrium molecular dynamics via Gauss's principle of least constraint

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              Dynamics of cluster-surface collisions.

              The structure, energetics, and dynamics of shock conditions generated in a nano-cluster upon impact on a crystalline surface are investigated with molecular-dynamics simulations for a 561-atom argon cluster incident with a velocity of 3 kilometers per second onto a sodium chloride surface. The "piling-up" shock phenomenon occurring upon impact, coupled with cascades of energy and momentum transfer processes and inertial confinement of material in the interior of the cluster, creates a transient medium lasting for about a picosecond and characterized by extreme local density, pressure, and kinetic temperature. The nano-shock conditions and impulsive nature of interactions in the newly formed compressed nonequilibrium environment open avenues for studying chemical reactivity and dynamics catalysed via cluster impact.

                Author and article information

                Tsinghua Science and Technology
                Tsinghua University Press (Xueyuan Building, Tsinghua University, Beijing 100084, China )
                05 June 2018
                : 06
                : 02
                : 195-207 (pp. )
                [ 1 ] College of Mechanical Engineering, Donghua University, Shanghai 201620, China
                [ 2 ] Nano-Science and Technology Research Center, Shanghai University, Shanghai 200444, China
                Author notes
                * Corresponding author: Ruling CHEN, E-mail: chen_ruling@ 123456163.com

                §  These authors contributed equally to this paper

                Ruling CHEN. He received his Ph.D. degree in mechanical engineering from the Tsinghua University in China in 2009. Now he is an associate professor at Donghua University. His research areas cover the nanotribology, ultra-precision surface machining/etc.

                Di ZHANG. Master student in inorganic chemistry major at the Shanghai University. His research interest is molecular dynamics simulation and ultra- precision surface machining.


                This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                Page count
                Figures: 14, Tables: 0, References: 35, Pages: 13
                Research Article


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