Establishment of Constitutive Model of Nitrile Butadiene Rubber Over a Wide Strain Rate Range
In order to establish the constitutive model of a class of polymer such as nitrile butadiene rub-ber under a wide range of strain rate loading condition,hyperelastic-viscoelastic model was used to accu-rately describe the mechanical properties of nitrile butadiene rubber.The stress-strain,energy storage modulus and loss modulus data of nitrile butadiene rubber were obtained by low strain rate compression test,medium strain rate dynamic frequency sweep test and high strain rate Hopkinson pressure bar test.The error weighted sum of squares of actural and theorical values for different test data as fitness function were improved by genetic algorithm to obtain the viscoelastic model described by fifth-order Prony series and analyze the influence rule of the number of Prony series on fitting effect.Taking a marine shock ab-sorber as object,its static stiffness,dynamic stiffness,damping ratio and impact stiffness were obtained through test,and the same working condition simulation experiment was conducted in ABAQUS,with simulated stiffness and damping ratio errors of less than 10%.The results show that considering various experimental data under different strain rate conditions,the constitutive model of nitrile butadiene rubber material optimized by genetic algorithm can describe the elastic and damping loss characteristics of rubber under a wide range of strain rate loading condition.
nitrile butadiene rubberconstitutive modelimpact loadstiffness and damping character-istics
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