Effect of Porosity and Normal Load on Dry Sliding Friction of Polymer Foam Blocks

Takeshi Yamaguchi, Takehiko Sugawara, Motoi Takahashi, Kei Shibata, Kenta Moriyasu, Tsuyoshi Nishiwaki, Kazuo Hokkirigawa

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


In this study, the effect of porosity on the dry sliding fiction of ethylene-vinyl acetate (EVA) foams was investigated under different normal load conditions. EVA foam blocks with varying porosities were slid against a smooth stainless steel plate under dry conditions. The friction coefficient increased with increasing porosity under all of the normal load conditions. In addition, the contact area was estimated using a contact model considering elastic buckling of the cell walls (elastic collapse). The elastic collapse area in the anterior portion of the EVA foam block increased with increasing normal load and porosity, which resulted in an increased contact area. Furthermore, the friction coefficient was positively correlated with the estimated contact area divided by the normal load, indicating that adhesion friction increases with increasing porosity of polymer foams. These results may contribute to the design of high-friction, lightweight shoe sole tread blocks prepared using polymer foam blocks.

Original languageEnglish
Article number34
JournalTribology Letters
Issue number1
Publication statusPublished - 2018 Mar 1


  • Elastic collapse
  • Foam
  • Friction
  • Normal load
  • Polymer


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