Optimizing the frictional behavior of partially wetting soft contacts as measured with hydrogel covered silicones

Toshiaki Nishi; Takeshi Yamaguchi; Kei Shibata; Kazuo Hokkirigawa

doi:10.1016/j.triboint.2020.106586

Optimizing the frictional behavior of partially wetting soft contacts as measured with hydrogel covered silicones

Toshiaki Nishi, Takeshi Yamaguchi, Kei Shibata, Kazuo Hokkirigawa

ENG - Finemechanics

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

In general, the friction behavior of soft materials is sensitive to wettability. To examine the effect of a non-uniform distribution of wettability, the friction between a rubber hemisphere partially covered with polyvinyl alcohol hydrogel patch and a glass plate under water-lubricated conditions was investigated. Experimental results revealed that the real contact area and friction coefficient increased and decreased with patch size relative to no hydrogel coating. Considering PVA hydrogel has low friction, it would be reasonable that these parameters decreased with the hydrogel patch size. However, the result exceeds this prediction. This effect occurred because the free energy of the system during contact formation was changed by adding the hydrogel.

Original language	English
Article number	106586
Journal	Tribology International
Volume	153
DOIs	https://doi.org/10.1016/j.triboint.2020.106586
Publication status	Published - 2021 Jan

Keywords

Contact area
Elastomer
Sliding
Wetting

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10.1016/j.triboint.2020.106586

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title = "Optimizing the frictional behavior of partially wetting soft contacts as measured with hydrogel covered silicones",

abstract = "In general, the friction behavior of soft materials is sensitive to wettability. To examine the effect of a non-uniform distribution of wettability, the friction between a rubber hemisphere partially covered with polyvinyl alcohol hydrogel patch and a glass plate under water-lubricated conditions was investigated. Experimental results revealed that the real contact area and friction coefficient increased and decreased with patch size relative to no hydrogel coating. Considering PVA hydrogel has low friction, it would be reasonable that these parameters decreased with the hydrogel patch size. However, the result exceeds this prediction. This effect occurred because the free energy of the system during contact formation was changed by adding the hydrogel.",

keywords = "Contact area, Elastomer, Sliding, Wetting",

author = "Toshiaki Nishi and Takeshi Yamaguchi and Kei Shibata and Kazuo Hokkirigawa",

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T1 - Optimizing the frictional behavior of partially wetting soft contacts as measured with hydrogel covered silicones

AU - Nishi, Toshiaki

AU - Yamaguchi, Takeshi

AU - Shibata, Kei

AU - Hokkirigawa, Kazuo

PY - 2021/1

Y1 - 2021/1

N2 - In general, the friction behavior of soft materials is sensitive to wettability. To examine the effect of a non-uniform distribution of wettability, the friction between a rubber hemisphere partially covered with polyvinyl alcohol hydrogel patch and a glass plate under water-lubricated conditions was investigated. Experimental results revealed that the real contact area and friction coefficient increased and decreased with patch size relative to no hydrogel coating. Considering PVA hydrogel has low friction, it would be reasonable that these parameters decreased with the hydrogel patch size. However, the result exceeds this prediction. This effect occurred because the free energy of the system during contact formation was changed by adding the hydrogel.

AB - In general, the friction behavior of soft materials is sensitive to wettability. To examine the effect of a non-uniform distribution of wettability, the friction between a rubber hemisphere partially covered with polyvinyl alcohol hydrogel patch and a glass plate under water-lubricated conditions was investigated. Experimental results revealed that the real contact area and friction coefficient increased and decreased with patch size relative to no hydrogel coating. Considering PVA hydrogel has low friction, it would be reasonable that these parameters decreased with the hydrogel patch size. However, the result exceeds this prediction. This effect occurred because the free energy of the system during contact formation was changed by adding the hydrogel.

KW - Contact area

KW - Elastomer

KW - Sliding

KW - Wetting

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Optimizing the frictional behavior of partially wetting soft contacts as measured with hydrogel covered silicones

Abstract

Keywords

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