かたさ(ハードネス)の粘弾性的とりあつかい

概要

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The quantity specified as hardness of rubber in.JIS is first related to the shear deformation characteristics of a viscoelastic material. After appropriate approximations, it is shown that there exists an approximate relation between the hardness and the relaxation modulus in shear for a sample such that; G(t)≅B(kp/kk)·({53.9+7.84Hs(t)}/[2.54{100-Hs(t)}]) Here G(t) and Hs(t) are the relaxation modulus in shear and the hardness expressed in terms of dynes/cm2 and Jis unit, respectively, and both are dependent on time, t; (kp/kk) is a proportionality factor of a fixed value of 1.0 ×106 (dynes/cut). B is a factor whose vlue is expected to be insensitive to the nature of samples. These relations were checked well by the experimental data on various kinds of vulcanized rubber, and a value of 3.3 (cm-1) was found for B therefrom.
日本ゴム協会の論文