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首页> 外文期刊>Journal of Applied Polymer Science >On Mooney and Mooney Stress Relaxation. II. A Nonlinear and Numerical Results
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On Mooney and Mooney Stress Relaxation. II. A Nonlinear and Numerical Results

机译：关于Mooney和Mooney应力松弛。二。非线性和数值结果

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It has been investigated whether the stress build-up and the stress relaxation involved in a Mooney test, with subsequent Mooney stress relaxation, can be described by nonlinear viscoelastic theory, more particulary the Wagner constitutive model. For this purpose, the viscoelastic behavior of three nonvulcanized EPDM materials, with similar Mooney viscosity but varying elasticity, has been stuided. Relaxation time spectra were obtained from dynamic mechanical experiments, from which the step-strain stress-relaxation modulus was calcualted .Stress build-up experiments were performed with a cone and plate system in order to obtained to obtain the so-celled dampling function (a measure for the deformation sensitivity) of the materials. Using these material functions, the Mooney test was successfully described with the Wagner constitutive model. Experimental and theoretical Mooney stress-relaxation rates are in close agreement. The predicted Mooney viscosity is up to 25% lower than the measured value. This may be due to nonideal conditions during the Mooney test, such as inhomogeneous heating and secodnary flows, and to inaccuracry of the damping function. The model calculations confirm the strong experimental dependence of Mooney measurements on small variations in instrumental condifitios such as geometry, rotation speed, and so forth.
机译：已经研究了是否可以通过非线性粘弹性理论，尤其是瓦格纳本构模型来描述门尼测试中涉及的应力累积和应力松弛以及随后的门尼应力松弛。为此，已经研究了三种未硫化的EPDM材料的粘弹性行为，它们具有类似的门尼粘度，但弹性不同。通过动态力学实验获得了弛豫时间谱，计算出了阶跃应变应力松弛模量。利用锥板系统进行了应力积累实验，从而获得了所谓的阻尼函数（a测量材料的变形敏感性）。使用这些材料函数，通过Wagner本构模型成功地描述了门尼测试。实验上和理论上的门尼应力松弛率非常一致。预测的门尼粘度比测量值低25％。这可能是由于门尼测试期间的非理想条件（例如不均匀的加热和气流）以及阻尼功能的不精确所致。模型计算证实了门尼测量结果对仪器条件的微小变化（例如几何形状，转速等）的强烈实验依赖性。

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