EPDM薄膜橡胶包覆材料的粘-超弹本构模型研究

Visco-Hyperelastic Constitutive Model for Filmy EPDM Inhibitor

为了描述一种新型三元乙丙（EPDM）橡胶薄膜包覆材料的力学性能，进行了不同拉伸速率（0．1～5mm／s）下的单轴拉伸试验和多步松弛试验。研究了材料的应力-应变响应，建立了有限变形下的粘一超弹本构模型。模型由超弹与粘弹两部分组成：超弹部分基于多项式应变能函数推导获得，粘弹部分则采用Maxwell模型来描述。通过单轴拉伸试验和多步松弛试验分别获得粘弹参数和超弹参数。将所建模型预测结果与试验结果相对比。结果表明：模型能很好地描述材料在20％工程应变范围内的力学特性，预测结果与试验结果最大偏差仅为5．6％，验证了模型的可靠性。

In order to investigate the mechanical behavior of a new kind of filmy Ethylene- Propylene-Dierie Monomer （EPDM） inhibitor, uniaxial tensile tests at different tensile rates （0.1 - 5mm/s） and multistep relaxation test were conducted. The stress-strain response of this material was studied and a visco-hyperelastic constitutive model was developed under finite deformation. The model consists of two parts： a hyperelastic part derived from a polynomial strain energy density function and a viscoelastic part described by the Maxwell model. The viscoelastic parameters were obtained by the uniaxial tensile tests and the hyperelastic parameters were obtained by multi-step relaxation test. Comparisons were made between the predictions based on the proposed model and the test result in the range of 20% engineering strain. The results show that the maximum deviation between the predictions and the test result is only 5.6%, which confirms that the constitutive model can describe the mechanical properties of this material well.