Anomalous Strain Recovery after Stress Removal of Graded Rubber

Autor: Quoc-Viet Do, Takumitsu Kida, Masayuki Yamaguchi, Kensuke Washizu, Takayuki Nagase, Toshio Tada
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Polymers, Vol 14, Iss 24, p 5477 (2022)
Druh dokumentu: article
ISSN: 14245477
2073-4360
DOI: 10.3390/polym14245477
Popis: Mechanical responses after the uniaxial deformation of graded styrene–butadiene rubber (SBR) with a gradient in the crosslink points in the thickness direction were investigated as compared with those of homogenously vulcanized SBR samples. The elongational residual strain of a graded sample was found to depend on the part with a high crosslink density. Therefore, it showed good rubber elasticity. After stress removal, moreover, the graded sample showed a marked warpage. This suggested that shrinking stress acted on the surface with a high crosslink density, which would avoid a crack growth on the surface. The sample shape was then recovered to be flat very slowly, indicating that the shrinking stress worked for a long time. This unique rubber elasticity, i.e., slow strain recovery with an excellent strain recovery, makes graded rubber highly significant.
Databáze: Directory of Open Access Journals
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