A magnification-based multi-asperity (MBMA) model of rough contact without adhesion

Gao, Xu; Ma, Benben; Zhu, Yichao

doi:10.1016/j.jmps.2019.103724

Cited by 25 publications

(9 citation statements)

References 66 publications

(182 reference statements)

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“…Based on the magnification-based multiasperity (MBMA) model, a surface could be regarded as a series of asperities decorated with smaller asperities. , The surface profile of zinc-coated steels could be separated into SSA and LSA. The asperities smaller than SSA could be treated as flattened areas, while the LSAs were too rigid to deform.…”

Section: Resultsmentioning

confidence: 99%

“…The G–W model considers the surface asperities to be single-scaled and neglects the influence of asperities in different scales, which leads to a deviation from practical application. The multiscale asperities are thought to strongly contribute to the contact characteristics such as contact condition and frictional behavior in many friction experiments. − Therefore, the stick–slip mechanism based on the G–W model would not provide a reliable explanation or prediction when multiscale asperities cannot be neglected. , As a result, the scale effect of surface asperities on stick–slip behavior remains elusive.…”

Section: Introductionmentioning

confidence: 99%

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Scale Effect of Surface Asperities on Stick–Slip Behavior of Zinc-Coated Steel

Gao

Zhao

et al. 2023

Langmuir

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Stick–slip behavior between friction pairs causes severe vibration problems such as abrasion and noise pollution, leading to material loss and deterioration in human health. This phenomenon is extremely complex because the surfaces of friction pairs have various asperities with different sizes. Therefore, it is of importance to understand the scale effect of asperities on the stick–slip behavior. Here, we selected four kinds of zinc-coated steels with multiscale surface asperities as a presentative example to reveal what types of asperities play the key role in affecting the stick–slip behavior. It is discovered that the stick–slip behavior is dominated by the density of small-scale asperities rather than large-scale asperities. High-density small-scale asperity increases the potential energy between asperities of the friction pairs, which leads to stick–slip behavior. It is suggested that decreasing the density of small-scale asperity on the surface significantly suppresses the stick–slip behavior. The present study reveals the scale effect of surface asperities on the stick–slip behavior and thus could offer a pathway to tailoring the surface topography of a wide range of materials for suppressing the stick–slip behavior.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Scale Effect of Surface Asperities on Stick–Slip Behavior of Zinc-Coated Steel

Gao

Zhao

et al. 2023

Langmuir

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“…The first studies of large assembly surfaces were conducted using experimental methods; however, the experimental approach could only obtain inputs and outputs, which did not reveal the intrinsically complex mapping relationships. Therefore, in order to clarify the relationships between the influencing factors mechanistically and to establish a model of contact characteristics under multi-factor coupling, various experts began to study the dynamic characteristics of assembly interfaces by establishing theoretical models [2].…”

Section: Introductionmentioning

confidence: 99%

Optimization of contact parameters of bolted joint surfaces based on fractal theory

Liu,

Zhao,

Niu

et al. 2023

Sixth International Conference on Computer Information Science and Application Technology (CISAT 2023)

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The contact characteristics of bolted joint surfaces are the key to affect the dynamic and static characteristics of mechanical systems. When the joint surface is in the vibration fatigue state, the damping will increase and the resonance frequency will decrease. Therefore, it is very important to establish an accurate contact model of the bolted joint surface to study the dynamic characteristics of the whole machine tool. Firstly, the contact model of a single asperity on rough surface is established based on Herz contact theory. On this basis, the contact stiffness and contact damping model of the whole bolted joint surface are obtained by integrating the asperity on the surface based on fractal theory; The influence of assembly load F, fractal dimension D and fractal rough ness coefficient G on contact stiffness K and contact damping C is obtained through the numerical analysis of the stiffness damping model by writing a Matlab program; Through finite element modal simulation, the mapping relationship between contact stiffness, damping and natural frequency of assembly structure is explored; The research results show that the contact stiffness and contact damping can not meet the improvement of the dynamic characteristics of the assembly at the same time. In this paper, the contact parameters of the bolted joint surface were optimized by the method of theoretical modeling, numerical simulation and finite element analysis, which improved the assembly performance and machining accuracy of the whole machine, and provided a theoretical basis for the realization of intelligent manufacturing

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“…Ciavarella suggested a simple closed-form approximate solution to the adhesive contact problem based on Persson's model [27]. Guo et al, developed a magnification-based multi-asperity (MBMA) model by evolving magnification into the GW model, and the multilength nature of a rough surface was taken into account properly [28]. Liu et al, presented an observation length-dependent (OLD) model of rough contact without adhesion, which covered the shortage of the real contact area stops changing as the average stress reaches the plastic yield stress in the Perrson model [29].…”

Section: Introductionmentioning

confidence: 99%

A Revised Continuous Observation Length Model of Rough Contact without Adhesion

et al. 2022

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The real contact area of rough surfaces has significant importance in many engineering applications, such as tribology, wear, lubrication and seals. A continuous observation length-dependent mechanic model of rough contact without adhesion is proposed, which assumes that the rough surface is divided into ideal subplanes. However, the model ignores the elastoplastic deformation of asperities, and the standard deviation of ideal subplanes’ heights is assumed to vary linearly with continuous observation length, which is not precise for all the surface fractal dimensions. In this work, a revised continuous observation length model is proposed with elastic, elastoplastic and fully plastic stages. The expressions of force and real contact areas are derived. For surfaces with different fractal dimensions, the quadratic polynomial, cubic polynomial and power relationships between standard deviation and observation length are proposed, respectively. In addition, the influences of the dimensionless observation length, fractal dimension and equivalent elastic modulus on the real contact areas in different contact stages are also analyzed. It can be concluded that the quadrate real contact area decreases as the dimensionless observation length decreases, which can be applied to the percolation theory for leak seal problems.

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A magnification-based multi-asperity (MBMA) model of rough contact without adhesion

Cited by 25 publications

References 66 publications

Scale Effect of Surface Asperities on Stick–Slip Behavior of Zinc-Coated Steel

Scale Effect of Surface Asperities on Stick–Slip Behavior of Zinc-Coated Steel

Optimization of contact parameters of bolted joint surfaces based on fractal theory

A Revised Continuous Observation Length Model of Rough Contact without Adhesion

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