ムーニー試験機内におけるゴムの変形流動機構および諸測定値と各種粘弾性量との相互関係
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概要
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The recently developed approximation of the theory of linear viscoelasticity involving the concept of the critical relaxation time, the information on the macroscopic flow unit which has been found and called the rheological unit by Mooney, and recent investigation on the non-linearity of the elasticity of raw rubbers are all put together to interpret quantitatively the deformation and flow behavior of raw rubbers in a Mooney viscometer. Then the empirical equations describing the time dependence of the shear stress in raw rubbers while rotating the rotor and also the stress relaxation behavior after sudden cessation of the rotation of the rotor, which were found several years ago, seemed to permit some phenomenological interpretations And thus the six time-independent parameters involved in those equations were correlated respectively with other viscoelastic quantities which could be measured separately. For instance, for the torque at the steady-flow state, (<I>XL</I>+<I>YL</I>), we have<BR><I>XL</I>≅ (1/<I>k<SUB>s</SUB></I>)γ<I><SUB>s</SUB></I><I>G′</I>(ω) |ω=γ<SUB>0</SUB><BR><I>YL</I>≅ (1/<I>k<SUB>s</SUB></I>)γ<SUB>0</SUB>η′(ω)|ω=γ<SUB>0</SUB><BR>Here <I>k<SUB>s</SUB></I> is a conversion factor between torque and shear stress; and γ<I><SUB>s</SUB></I> and t s are the elastic strain at the steady-flow state and the rate of shear (constant), respectively; <I>G′</I>(ω) and η′(ω) are the real parts of the complex rigidity and viscosity, respectively; and ω is the angular frequency.<BR>Experimental data obtained under various conditions both in material and exitation checked fairly well those relations.
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