Investigation on transient response characteristics of polyurethane cushioning materials
In order to study the transient response characteristics of polyurethane materials under dynamic loading,polyurethane sample compression experiments are carried out,and the Mooney-Rivlin strain energy function and Prony series constitutive model parameters of polyurethane sample materials are verified by experimental data analysis.Then,the finite element method is used to calculate and analyze the dynamic mechanical properties of the polyurethane cushion material.The results show that polyurethane materials have nonlinear output characteristics related to super elasticity and hysteresis effects related to viscoelasticity,and there are significant differences in the force-displacement response curve of polyurethane materials under low-speed and high-speed loading conditions.Under low-speed loading conditions,the viscoelastic properties of the rate correlation have less influence on the curve;Under high-speed loading conditions,the rate-dependent viscoelasticity characteristics significantly increase the slope of the response curve;Under local loading conditions,the load and shear force are coupled,and the size of the supporting force provided by the polyurethane in the compression direction is related to the area of action of the loaded area,and the larger the area,the greater the supporting force provided by the polyurethane material.
polyurethane materialstransient responsecompression experimentsfinite element simulationconstitutive models
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