Friction and Friction Heat of Micronscale Iron

Sang, Le Van; Yano, Akihiko; Isohashi, Ai; Sugimura, Natsuko; Washizu, Hitoshi

doi:10.1115/1.4046815

Cited by 12 publications

(4 citation statements)

References 37 publications

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“…This anisotropy can be also figured out as the jumps of the tip due to the variation of the interaction. This situation has not been observed in the previous studies for the sliding friction of various materials by using the SPH method [10][11][12][13]. Therefore, the anisotropy of the particle shape can be the main reason causing this result.…”

Section: Resultsmentioning

confidence: 75%

“…The spring force presenting the interaction between the interfacial particles, one of the lowest layer of the slider and the other of the highest layer of the substrate, is described as (6) where K α is the spring constant. For the micronscale or macroscale contacts, the spring force has been found to well present the interaction between the interfacial coarse-grained particles such as the particles of solid rocks, iron, alumina and hematite in the previous studies of the sliding friction [10][11][12][13]. In order to apply the Prandtl-Tomlinson model, the particles of the slider are acted by other spring force as (7) where K, t, r → 0 and V → s (V → s = (V s , 0,0)) are the spring constant, the sliding time, the initial position vector and the sliding velocity of the slider along the x-direction, respectively.…”

Section: Methods and Simulationmentioning

confidence: 99%

See 1 more Smart Citation

Adaptive Smoothed Particle Hydrodynamics for Study of Friction of Silica at Micronscale

et al. 2020

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The paper focuses on examining agreement of the adaptive smoothed particle hydrodynamics (ASPH) in the investigation of the sliding friction of silica at micronscale throughout observation of several friction characteristics. It is found that the ASPH approach well presents the friction of micronscale silica due to agreement of the friction coefficient and the applied load-friction coefficient relationship between the present results and the previously experimental reports. The shape of the particle modeled in the ASPH almost does not effect on the detected results for the hard system due to the very slight variation of the particles during the sliding. However, the variation of the particles can explain for the discrepancy between the stick time and the slip time and the unsharp change between the stick state and the slip one. The study is also extended for the contacts of the two sinusoidal rough surfaces and finds that the friction coefficient is almost independent of the wavelength while it linearly increases with the amplitude.

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Section: Resultsmentioning

confidence: 75%

Section: Methods and Simulationmentioning

confidence: 99%

Adaptive Smoothed Particle Hydrodynamics for Study of Friction of Silica at Micronscale

et al. 2020

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“…Wang et al [24] from the Institute of Metal Research, Chinese Academy of Sciences, initially discovered a linear relationship between system deformation and applied load in the total slip state, introducing a defined system deformation ratio that can predict operational states under specific loads and displacements. A team from Hyogo University in Japan [25] utilized smooth particle fluid dynamics to simulate friction and frictional heat generation in micron-sized iron considering factors such as sliding speed and substrate temperature, ultimately revealing the temporal evolution of frictional heat during sliding.…”

Section: Introductionmentioning

confidence: 99%

Stiffness characteristics of angular contact ball bearing considering thermal - mechanical coupling

gao,

xu,

chen

et al. 2024

Preprint

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When the rotor is rotating at high speed, the ball bearing stiffness exhibits strong nonlinear characteristics. This paper primarily investigates the influence of different speeds, axial loads, and other factors on the angular contact ball bearing stiffness. To address the inconvenience of simultaneously simulating dynamic temperature fields and deformation results using ANSYS software, a novel coupling method is proposed to achieve simulation results that closely resemble actual working conditions. By utilizing a MATLAB script program based on Palmgren's friction heat generation theory, real-time extraction of frictional heat generation in high-speed angular contact ball bearings under combined shaft action, radial load, and speed is achieved. The obtained heat generation results are then applied as boundary conditions in the finite element model of bearings to establish a coupling field for further analysis. Subsequently, Ansys Workbench simulates the impact of this coupling model on relative displacement between inner and outer rings under identical load and speed conditions to ultimately obtain dynamic stiffness results for angular contact ball bearings. A novel approach to calculating stiffness was introduced in the subsequent bearing stiffness test bench, wherein the radial load and relative displacement of the measured angular contact ball bearing were determined by converting material mechanics formulas. This method effectively addresses the inconvenience of measuring bearing stiffness in rotor systems and aligns with simulation results.The findings indicate that bearing dynamic stiffness increases with axial load at constant speed, with axial stiffness being greater than radial stiffness. Additionally, higher rotational speeds under coaxial loads result in more pronounced increases in frictional heat but lead to decreased overall stiffness. The feasibility of simulation results from thermal-mechanical coupling models has been demonstrated.

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“…Research on the nano/microscale starts from the structure of atoms and molecules. The analysis of the contact and friction behavior of rough surfaces is carried out by molecular dynamics (MD) simulations, which supplements theoretical analyses and experimental measurements and provides a new method to investigate the mechanism of thermal effects and the changes in dynamic microstructure [6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulations on the thermal effect of interfacial friction during the asperity shearing

Yuan

Zhao

Huang

2023

Int. J. Mod. Phys. C

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To explore the thermal effect of interfacial friction at the nano/microscale, a solid-solid contact model of a rough surface with a single peak was established to research single-crystal Fe. The friction characteristics, stress distributions, temperature changes, and energy changes under different indentation depths and lattice orientations during the shearing process were analyzed. From the perspective of temperature and energy, the mechanism of the thermal effect was revealed. The relationship between the friction force, temperature, and energy at the atomic scale was clarified. The results showed that the temperature of the asperities gradually increased during the shearing process, and a stress concentration formed in the shearing zone. After contact, the asperities had undergone unrecoverable plastic deformation, and there was wear at the contact interface accompanied by the loss of atoms from the asperity. At each indentation depth, as the rotation angle of the crystal increased, the friction force, average temperature, and the sum of the changes in thermal kinetic and thermal potential energy all first increased and then decreased; the trends of the three parameters changing with the rotation angle of the crystal were consistent. The average decreases in the friction force, average temperature, and the sum of the changes in thermal kinetic and thermal potential energy were 52.47%, 30.91%, and 56.75%, respectively, for a crystal structure with a rotation angle of 45° compared to a crystal structure with a rotation angle of 0°. The methods used in this study provide a reference for the design of frictional pairs and the reduction of the thermal effect of interfacial friction.

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Friction and Friction Heat of Micronscale Iron

Cited by 12 publications

References 37 publications

Adaptive Smoothed Particle Hydrodynamics for Study of Friction of Silica at Micronscale

Adaptive Smoothed Particle Hydrodynamics for Study of Friction of Silica at Micronscale

Stiffness characteristics of angular contact ball bearing considering thermal - mechanical coupling

Molecular dynamics simulations on the thermal effect of interfacial friction during the asperity shearing

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