Development of Volunteer Shoes for Tokyo 2020 Based on Tribology

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  • トライボロジーに基づく東京2020大会フィールドキャスト (大会スタッフ) ユニフォームシューズの開発
  • トライボロジー ニ モトズク トウキョウ 2020 タイカイ フィールドキャスト(タイカイ スタッフ)ユニフォームシューズ ノ カイハツ

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<p>To achieve human movement, an external force is often required via contact between the human body and another surface, thus inducing friction and wear. It is therefore reasonable to design sports and active gear based on tribology. Considering shoes alone, many interfaces must be considered; e.g., outer sole and floor, inner lining and sock, and shoelaces with themselves. Each interface relates to the shoe performance, including slip resistance, wear resistance, and fitting. In particular, the slip and wear resistance are directly determined by the friction and wear behaviors of the outer sole, generally constructed of rubber. A common method used to decrease weight and eliminate the bonding process labor is to mount a single piece of foam resin as the mid- and outer soles, designated as a unisole. Because the low elastic modulus inherent in a porous structure induces a high real contact area, the foam resin exhibits high friction; while the high porosity also decreases wear resistance. Further, the foam resin porosity distribution is not uniform, especially near the interface with a skin layer. Previous reports show that friction and wear behaviors of cross-linked ethylene vinyl acetate foam with a skin layer are sensitive to the foam porosity of the wear surface, which varies during the wear process, and that decreasing the foam bulk porosity and the contact pressure improves wear resistance. Considering these reports, a new unisole material for volunteer shoes in Tokyo 2020 was developed exhibiting reduced porosity and elastic modulus. The low porosity also achieves a high settling resistance, which allows the unisole structure to be fitted with holes for improved breathability.</p>

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