Inelastic contact behaviors of nanosized single-asperity and multi-asperity on α-Fe surface: Molecular dynamic simulations

Xie, Wenzhen; Liu, Chao; Jiang, Dongxiang; Jin, Jianfeng

doi:10.1016/j.ijmecsci.2021.106569

Cited by 13 publications

(2 citation statements)

References 45 publications

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“…In contrast, the importance of asperity GaAs in the scratching behavior for the underlying micromechanical response has long been neglected. For example, in MD simulations of crystal deformation, the deformation behavior of a roughened workpiece is significantly different from that of a flat workpiece [17]. Therefore, existing studies remain poorly understood on the effect of the mechanical loads' frictional behavior in plowing on the microscopic deformation of the single asperity GaAs.…”

Section: Introductionmentioning

confidence: 99%

The Dislocation- and Cracking-Mediated Deformation of Single Asperity GaAs during Plowing Using Molecular Dynamics Simulation

Fan

et al. 2022

Micromachines

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This work simulates the plowing process of a single asperity GaAs by diamond indenter using molecular dynamics simulations. The deformation mechanism of asperity GaAs is revealed by examining the topography evolution and stress state during the plowing. This work also investigates the origin of the influence of asperity size, indenter radius and plow depth on the deformation of the asperity GaAs. We observed the initiation and propagation of cracks up to the onset of fracture and the plastic activity near the indenter, obtaining more information usually not available from planar GaAs in normal velocity plowing compared to just plastic activity. The simulations demonstrated the direct evidence of cracking in GaAs induced by plowing at an atomic level and probed the origin and extension of cracking in asperity GaAs. This finding suggests that cracking appears to be a new deformation pattern of GaAs in plowing, together with dislocation-dominated plasticity modes dominating the plowing deformation process. This work offers new insights into understanding the deformation mechanism of an asperity GaAs. It aims to find scientific clues for understanding plastic removal performed in the presence of cracking.

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Section: Introductionmentioning

confidence: 99%

The Dislocation- and Cracking-Mediated Deformation of Single Asperity GaAs during Plowing Using Molecular Dynamics Simulation

Fan

et al. 2022

Micromachines

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“…2,3 From a microscopic perspective, the contact behavior of these joints only appears on the rough surface asperities, which will cause the discontinuity of the mechanical structure and in turn affect the dynamic characteristics (including friction, wear and fatigue) of the machine. [4][5][6] It is found that 60% of the total stiffness and 90% of the total damping are directly related to the joint surface. 7 Therefore, establishing an effective contact stiffness model with the consideration of surface topography is essential for accurately evaluating the mechanical properties of the joints, which can subsequently help to improve the structural integrity and operational reliability of the whole system.…”

Section: Introductionmentioning

confidence: 99%

Normal contact stiffness model for fractal surfaces considering scale dependence and friction behavior

Huang

Liu

Xie

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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The normal contact stiffness on rough surfaces has a significant impact on the interfacial dynamic characteristics of mechanical joints. Based on the fractal geometry theory, this work improves the contact stiffness modeling by considering the complete contact characteristics of multiple asperities and frictional factor. First, to include the property that the critical contact areas of asperities are scale-dependent, the model for the contact stiffness is formed on each scale and the relationship between total stiffness and load on rough surfaces is obtained by the summation of all length scale asperities. Second, friction factor is taken into account in the revised normal contact stiffness model, where a contact friction coefficient is introduced into the equation to incorporate the effects of friction force. Moreover, the influences of fractal dimension D and fractal roughness G on normal contact stiffness and friction coefficient are investigated. Through the comparison of numerical and experimental results, the revised model is shown to be more reasonable and presents higher consistency of the stiffness versus load curve than the original model. It is therefore concluded that a complete and more accurate model for normal contact stiffness is proposed in this work with precise modeling of scale-dependent contact characteristics and friction behavior taken into account, which is critical for exact estimation of rigidity of contact surfaces in industrial applications.

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Tangential contact stiffness modeling between fractal rough surfaces with experimental validation

Huang,

Liu,

Xie

et al. 2024

Arch Appl Mech

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Inelastic contact behaviors of nanosized single-asperity and multi-asperity on α-Fe surface: Molecular dynamic simulations

Cited by 13 publications

References 45 publications

The Dislocation- and Cracking-Mediated Deformation of Single Asperity GaAs during Plowing Using Molecular Dynamics Simulation

The Dislocation- and Cracking-Mediated Deformation of Single Asperity GaAs during Plowing Using Molecular Dynamics Simulation

Normal contact stiffness model for fractal surfaces considering scale dependence and friction behavior

Tangential contact stiffness modeling between fractal rough surfaces with experimental validation

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