In this study tensile deformation under pure elongation of unfilled and carbon black filled SBR vulcanizates has been investigated experimentally. The results are presented and compared with the corresponding failure characterization of SBR vulcanizates applied to simple elongation. Contrary to the damage process under simple elongation, in pure elongation damage is caused by formation of density heterogeneities resulting in dilatation attributed to the formation and the growth of cavities. However, with evolution of cavities, the degree of constraint strain is reduced, which reduces the local stress concentration in rubber parts.
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