Effect of specimen thickness on growth of real contact area of rubber with two-dimensional regular wavy surface

Matsuda, Kenji; Mori, Sotaro; Hatanaka, Akira; Sunahara, Taka; Nakamura, Kenya

doi:10.1016/j.triboint.2018.02.010

Cited by 7 publications

(8 citation statements)

References 23 publications

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“…As expected, the real contact area increases with increasing surface pressures, as already investigated in literature [6] [14] [15]. Further Figure 13 shows the real contact area is decreasing with increasing hardness.…”

Section: Investigation Of the Contact Areasupporting

confidence: 83%

Friction and Deformation Behavior of Elastomers

Adam¹,

Paulkowski²,

Mayer³

2019

MSA

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This research paper is about investigating the mechanisms of elastomeric friction at low velocities. To do so, different experimental setups were performed to analyze friction, adhesion and surface energy among others. The tested materials were EPDM samples with variations in the carbon black content. It was found, that at least for low velocities, the real contact area has the main impact on the friction of elastomers. This contact area seems to be highly influenced by the hardness or other bulk properties of the elastomers, which are modified by the varying carbon black content. 528Materials Sciences and Applications ferent contact areas of the elastomeric materials. The aim is to gain a better understanding of how friction reduction is influenced.

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Section: Investigation Of the Contact Areasupporting

confidence: 83%

Friction and Deformation Behavior of Elastomers

Adam¹,

Paulkowski²,

Mayer³

2019

MSA

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“…[21,22] Rubinstein et al [5] believed that for the contact of the surface with small roughness (RMS < 0.1 µm), the nonlinear phenomenon might be related to the evanescent wave, and the measurement error of contact area would be caused by the tunneling effect [27] of light when the real contact area was measured based on the total reflection method. Different from the analysis of Rubinstein et al, Matsuda et al [24,25] compared the effects of vacuum, dry and wet environment on real contact area, and found that the relationship between real contact area and normal load would be related to the existence of fluid between contact interface. The smaller the compression ratio of fluid, the slower the growth rate of real contact area with normal load.…”

Section: Introductionmentioning

confidence: 94%

“…On the contrary, if there is no fluid in the contact interface, the relationship between real contact area and normal load tends to be linear. [24,25] The comparison of the results between WFT and AFT show that, the resistance of fluid between the contact interfaces is an important factor that leads to the slow growth of the contact area.…”

Section: Experiments Of Nonlinear Phenomenon Of Real Contact Areamentioning

confidence: 99%

“…[2,[17][18][19][20][21][22] The size of the contact interface, the contact material, the surface morphology and the loading mode may lead to real contact area growth slowing down with the increase of the normal load. [23][24][25] The relationship between the real contact area and normal load is nonlinear. The more obvious the change of real contact area growth rate is, the more obvious the nonlinear characteristic is.…”

Section: Introductionmentioning

confidence: 99%

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Experimental analysis of interface contact behavior using a novel image processing method*

Han¹,

Luo²,

Zhang³

et al. 2021

Chinese Phys. B

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The spatial and temporal evolution of real contact area of contact interface with loads is a challenge. It is generally believed that there is a positive linear correlation between real contact area and normal load. However, with the development of measuring instruments and methods, some scholars have found that the growth rate of real contact area will slow down with the increase of normal load under certain conditions, such as large-scale interface contact with small roughness surface, which is called the nonlinear phenomenon of real contact area. At present, there is no unified conclusion on the explanation of this phenomenon. We set up an experimental apparatus based on the total reflection principle to verify this phenomenon and analyze its mechanism. An image processing method is proposed, which can be used to quantitative analysis micro contact behaviors on macro contact phenomenon. The weighted superposition method is used to identify micro contact spots, to calculate the real contact area, and the color superimposed image is used to identify micro contact behaviors. Based on this method, the spatiotemporal evolution mechanism of real contact area nonlinear phenomena is quantitatively analyzed. Furthermore, the influence of nonlinear phenomenon of real contact area on the whole loading and unloading process is analyzed experimentally. It is found that the effects of fluid between contact interface, normal load amplitude and initial contact state on contact behavior cannot be ignored in large-scale interface contact with small roughness surface.

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“…Mastsuda, in 2014, used an in-situ method to observe the real contact area between two-dimensional regular surface and a flat surface, and found that the growth speed of the real contact area drops sharply after the contact spots touch the neighbors, and then the real contact area keep almost constant reaching the complete contact [17]. After then, he did the same experiment in the wet environments, and found the saturated contact area fraction is far smaller than one [18]. Buchner in 2009 give a new numerical method to simulate the real contact area under normal load considering the material properties and real asperity slopes, he obtained the non-linear area load curve, which approaches to complete contact under heavy load [19].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear increase of the real contact area of PMMA blocks and the related contact model

Luo

Wu²,

Yan

2022

Preprint

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Many experiments have proved the contact models, such as GW model, MB model, however, most of past validations are under light load. In this paper, based on total reflection method, we performed direct measurements of the real contact area between two polymethylmethacrylate (PMMA) blocks under heavy load, and utilized the image processing method to analyze the contact area. The results shows that the real contact area increase with normal load linearly in light load, but non-linearly under heavy load; the number of contact spots increase with load linearly in light load, but also nonlinearly under heavy load, synchronous with the changing of real contact area. We used GW and MB model to predict the experiment result, and found that both models failed to predict the nonlinear stage. Finally, we proposed a revised GW model based on the hypothesis of bulk deformation to predict the non-linear stage.

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Effect of specimen thickness on growth of real contact area of rubber with two-dimensional regular wavy surface

Cited by 7 publications

References 23 publications

Friction and Deformation Behavior of Elastomers

Friction and Deformation Behavior of Elastomers

Experimental analysis of interface contact behavior using a novel image processing method*

Nonlinear increase of the real contact area of PMMA blocks and the related contact model

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