In order to study the tensile rate dependence of EPDM mechanical behavior,uniaxial tensile tests of EPDM at 3 mm/min,30 mm/min,300 mm/min and 500 mm/min were carried out,respectively.The nonlinear mechanical behavior laws and tensile rate characteristics of EPDM were analyzed.Based on the fractional-order Kelvin-Vogit,ZWT and OGDEN models,the experimental curves of different tensile rates at 160％strain were fitted,and the characterization ability of the models was compared and studied.The results show that the whole loading curve of EPDM presents a typical"S"shape,and has significant nonlinear hysteresis characteristics.The larger the tensile rate,the larger the area of hysteresis loop,and the stronger the damping loss capacity.When the strain is greater than 68％,the tensile rate has a signifi-cant effect on the mechanical properties of EPDM,and hardening occurs.The fractional Kelvin-Vogit and OGDEN models are suitable for the characterization of mechanical behavior of viscoelastic materials of EP-DM when the strain is less than 68％at a low tensile rate,while the ZWT model is suitable for the charac-terization of mechanical behavior of viscoelastic materials of EPDM when the strain is more than 100％at a high tensile rate.The ZWT model also has a good fitting effect at low tensile rate.The results can provide a useful reference for the performance evaluation and optimization of EPDM products.
维普
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