Nanotribological simulations of multi-grit polishing and grinding

Eder, Stefan J.; Cihak-Bayr, Ulrike; Pauschitz, A.

doi:10.1016/j.wear.2015.03.006

Cited by 35 publications

(12 citation statements)

References 10 publications

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“…In this work, we apply a recently proposed modeling and evaluation approach based on molecular dynamics (MD) simulations [16,17] to quantify the wear depth, the contact area, and the friction force that arise during the two-body wear of a nanorough Fe surface due to multiple hard abrasive particles. The discussion of the wear and friction laws that are applicable to dry multiasperity abrasion at the nanoscale is the purpose of this Letter.…”

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confidence: 99%

Applicability of Macroscopic Wear and Friction Laws on the Atomic Length Scale

et al. 2015

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Using molecular dynamics, we simulate the abrasion process of an atomically rough Fe surface with multiple hard abrasive particles. By quantifying the nanoscopic wear depth in a time-resolved fashion, we show that Barwell's macroscopic wear law can be applied at the atomic scale. We find that in this multiasperity contact system, the Bowden-Tabor term, which describes the friction force as a function of the real nanoscopic contact area, can predict the kinetic friction even when wear is involved. From this the Derjaguin-Amontons-Coulomb friction law can be recovered, since we observe a linear dependence of the contact area on the applied load in accordance with Greenwood-Williamson contact mechanics.

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confidence: 99%

Applicability of Macroscopic Wear and Friction Laws on the Atomic Length Scale

et al. 2015

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“…The initial grain shape selection is significantly important to properly model the grain wear evolution. The grain shape is usually modeled in 3D as a sphere, pyramid, irregular polyhedron, or hexahedron (3D shape) [36,37]. In 2D modeling, a circle, triangle, or hexagon are typically employed [38][39][40].…”

Section: Model Geometry and Governing Equationsmentioning

confidence: 99%

Wear evolution and stress distribution of single CBN superabrasive grain in high-speed grinding

Wang

Ding

et al. 2018

Precision Engineering

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In this study, both finite element analysis (FEA) and experimental observations were used to investigate the single CBN grain wear in high-speed grinding of Inconel 718 superalloy. The wear characteristics for each grinding pass were numerically assessed utilizing the tensile and compressive strength limits of the cutting grain. Additionally, stress distribution within the grain, chip formation and grinding force evolution during multiple passes were investigated. The combined experimental and numerical results show that the CBN grain wear has two major modes: the macro fracture on the grain top surface propagating from the rake surface, and the micro fracture near the cutting edges. The resultant tensile stress is the main factor inducing grain wear. The cutting edges will be under self-sharpening due to the grain wear. With multiple micro cutting edges engaged in grinding process, the limited material removal region was divided into different sliding, ploughing and cutting dominant regions. Overall, the ratio of material elements removed by a cutting process ranges from 80% to 20%, and continue to decrease during the grinding process. With a stronger effect of the cutting process, larger fluctuation of the grinding force will commence, however its average value remains below that with stronger sliding and ploughing process characteristics.

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“…Numerical simulation is an effective way to obtain the dynamic fracture process, which can obtain the instantaneous fracture state and is an important supplement to experimental study. The existing numerical simulation methods of abrasive fracture mainly include the finite element method (FEM) [18,19], molecular dynamics method (MD) [20,21], and the coupling approach of FEM and smooth particle hydrodynamics method (SPH) [22]. The MD method is capable of simulating the surface generation [23], abrasive wear [21] and surface roughness [24] in nanoscale machining processes, but it has limitation in dealing with micron to macro scale problems due to its high demand of computational resources.…”

Section: Introductionmentioning

confidence: 99%

“…The existing numerical simulation methods of abrasive fracture mainly include the finite element method (FEM) [18,19], molecular dynamics method (MD) [20,21], and the coupling approach of FEM and smooth particle hydrodynamics method (SPH) [22]. The MD method is capable of simulating the surface generation [23], abrasive wear [21] and surface roughness [24] in nanoscale machining processes, but it has limitation in dealing with micron to macro scale problems due to its high demand of computational resources. FEM is based on continuum mechanics to establish the equations of motion and constitutive models of materials.…”

Section: Introductionmentioning

confidence: 99%

Peridynamic Simulation to Fracture Mechanism of CBN Grain in the Honing Wheel Dressing Process

et al. 2021

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Regularly dressing of CBN honing wheel is an effective way to keep its sharpness and correct geometry during honing process. This study aims to understand the fracture mechanism of single CBN grain in the dressing process of honing wheel. The honing wheel dressing process was simplified into the dressing process of grinding wheel, and the bond-based Peridynamic method considering bond rotation effect was developed to investigate the progressive fracture evolution, stress characteristics, and fracture modes of CBN grains in this process. It was found that fracture evolution of CBN grains mainly underwent four stages: elastic deformation, damage initiation, crack formation, and macro fracture. In addition, the fracture initiation and propagation were mainly determined by the tensile and shear stress, where the former led to mode I fractures and the latter led to mode II fractures. The propagation of mode I fractures was stable while the propagation of mode II fracture was unstable. The results show that the Peridynamic approach has great potential to predict the fracture mechanism of CBN grain in the dressing process of honing and grinding wheels.

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Nanotribological simulations of multi-grit polishing and grinding

Cited by 35 publications

References 10 publications

Applicability of Macroscopic Wear and Friction Laws on the Atomic Length Scale

Applicability of Macroscopic Wear and Friction Laws on the Atomic Length Scale

Wear evolution and stress distribution of single CBN superabrasive grain in high-speed grinding

Peridynamic Simulation to Fracture Mechanism of CBN Grain in the Honing Wheel Dressing Process

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