For tire tread rubbers A1 and A2 which were the same kind of rubber but with different cross-linking densities
dynamic tensile experiment was conducted to obtain the curves of storage modulus and loss modulus versus loading frequency. In order to quantitatively analyze the energy loss of rubber under dynamic load with different frequencies and temperatures
a viscoelastic constitutive equation based on generalized Maxwell model was developed. An algorithm of non-linear regression was proposed to fit the curves of dynamic modulus versus loading frequency respectively in low frequency phase (10-25 Hz) and high frequency phase (25-60 Hz). And then the parameter values of storage modulus and loss modulus in the form of generalized Maxwell model were obtained. The dynamic tensile process of the tread rubber was simulated by finite element code Abaqus
and the loss tangent was calculated; hence the changing characteristic of loss tangent under different frequencies was revealed. Through the comparison of experimental results and simulated results of the loss tangent
it was proved that the viscoelastic constitutive model and its parameter determination method could be used to accurately analyze the tread rubber's dynamic tensile performance. Quantitative predictions of the tread rubber stress-strain hysteresis loop and the energy dissipation in a full deformation cycle under different temperatures and frequencies were performed
and then the change rule of the energy dissipation under such circumstance was explained. The results reveal that the energy dissipation of tread rubbers is gradually increased as the loading frequency increases
whereas its dependence on frequency is gradually reduced as the temperature increases. Meanwhile
the structure-function relationship of tread rubber was explored through the comparative testing of cross-linking density. Although the cross-linking density of tread rubber A2 was slightly higher than that of tread rubber A1
the energy loss of tread rubber A2 was larger than that of tread rubber A1 under the same conditions due to the higher proportion of the dangling chain end in the molecular chain.
关键词
橡胶能量损耗动态模量黏弹性模型有限元模拟
Keywords
RubberEnergy lossDynamic modulusViscoelastic modelFinite element method
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Related Author
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Related Institution
School of Materials Science and Engineering, Shandong University
Shandong LL Tire Co. LTD., Zhaoyuan
State Key Laboratory of Fine Chemicals, Department of Polymer Science and Engineering, School of Chemical Engineering, Dalian University of Technology
Key Laboratory of Rubber-plastics, Ministry of Education, Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science and Technology
School of Materials Science and Engineering, South China University of Technology