ゴムのひずみ速度依存性構成式とカーボンブラック充填ゴムの変形挙動シミュレーション

概要

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Carbon-black (CB) filled rubber used as materials of tire exhibits the characteristic deformation behavior. Especially, the strength and hysteresis loss of CB filled rubber increase as against unfilled rubber. A viscoelastic constitutive equation of unfilled rubber is developed based on the reptation theory to represent these typical deformation behavior. The finite element homogenization method and developed constitutive equation provide a computational model of CB filled rubber. The computational simulation reveals the mechanism of hysteresis, the strain-rate-dependent nature and the stress relaxation of unfilled/CB filled rubber. Subsequently, it has been revealed that the significant orientation hardening and the delay of viscoelastic response due to the highly localized deformation in the rubber cause the increase of resistance to the macroscopic deformation with the CB filling and the increase strain rate. These responses of molecular chain during the deformation result the increase of the hysteresis loss under cyclic straining. Furthermore, the influence of the volume fraction of CB on deformation behavior, and the stress relaxation of CB filled rubber are discussed.
2007-05-25