マルチサイクルインデンテーション試験による高分子材料の粘弾性特性評価

抄録

Multicycle indentation test is applied to measure viscoelastic characteristic. In multicycle indentation test, indentation test is repeated at the same position on the specimen, and the mechanical characteristics are measured from on the impression. Therefore, the evaluation formula is introduced for the indentation measurement on the impression. An undeformed specimen and plastically deformed specimen of ABS resin are used. The result shows the measured creep compliance by multicycle indentation test is in good agreement with that by uniaxial tensile test. Thus, the proposed method can measure viscoelastic characteristics with high accuracy. Measured characteristics indicate that the undeformed specimen is isotropy but the plastically deformed specimen is anisotropy. This fact implies the development of anisotropy by reorientation and elongation of polymer chains during uniaxial plastic deformation.