Dynamic mechanical behavior and nonlinear hyper-viscoelastic constitutive model of SiO2 particle-reinforced silicone rubber composite:experimental and numerical investigation
Dynamic mechanical behavior and nonlinear hyper-viscoelastic constitutive model of SiO2 particle-reinforced silicone rubber composite:experimental and numerical investigation
张羲黄 1吴学星 1杨荷 1陈莹 2程祥利 1刘波 1赵慧1
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作者信息
1. Institute of Electronic Engineering,China Academy of Engineering Physics,Mianyang 621999,China
2. State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081,China
SiO2-particle reinforced silicon rubber composite(SP-RSRC)is a widely utilized material that offers shock absorption protection to various engineering structures in impact environments.This paper presents a comprehensive investigation of the mechanical behavior of SP-RSRC under various strain rates,employing a combination of experimental,theoretical,and numerical analyses.Firstly,quasi-static and dynamic compression tests were performed on SP-RSRC utilizing a universal testing machine and split Hopkinson pressure bar(SHPB)apparatus.Nonlinear stress-strain relationships of SP-RSRC were obtained for strain rates ranging from 1 × 10-3 to 3065 s-1.The results indicated that the composite showed evident strain rate sensitivity,along with nonlinearity.Then,a nonlinear visco-hyperelastic constitutive model was developed,consisting of a hyperelastic component utilizing the 3rd-order Ogden energy function and a viscous component employing a rate-dependent relaxation time scheme.The model accurately characterized the dynamic mechanical response of SP-RSRC,effectively mitigating the challenge of calibrating an excessive number of material parameters inherent in conventional viscoelastic models.Furthermore,the simplified rubber material(SRM)model,integrated within the LS-DYNA software,was chosen to depict the mechanical properties of SP-RSRC in numerical simulations.The parameters of the SRM model were further calibrated based on the strain-stress relationships of SP-RSRC,as predicted by the developed nonlinear visco-hyperelastic constitutive model.Finally,an inverse ballistic experiment using a single-stage air gun was conducted for SP-RSRC.Nu-merical simulations of SHPB experiments and the inverse ballistic experiment were then performed,and the reliability of the calibrated SRM model was verified by comparing the results of experiments and numerical simulations.This study offers a valuable reference for the utilization of SP-RSRC in the realm of impact protection.
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