Strain rate dependent constitutive model for predicting the material behaviour of polyurea under high strain rate tensile loading

摘要

A strain rate dependent constitutive material model to predict the high strain rate behaviour of polyurea has been proposed. The well-known nine parameter Mooney-Rivlin constitutive material model was considered as the base model in deriving the rate dependent material model. A rate dependent term was introduced into the original Mooney-Rivlin model and was validated using high strain material data for polyurea. Due to its simplified formation and extensive use in finite element codes such as LS-DYNA~® and ANSYS~®, improvement of the original model shows a higher significance in terms of constitutive model development for hyper-elastic materials. High strain rate tensile tests program has been conducted to obtained the material model parameters. Experimental and model prediction for both stress-strain and energy behaviour of the material indicates close agreement. Stress-strain non-linearity and high strain rate sensitivity of polyurea is also highlighted in this paper.