Dynamic impact constitutive model of silicone rubber
The dynamic mechanical properties of silicone rubber were studied using a Split Hopkinson Pressure Bar(SHPB)experimental setup.To accurately obtain the stress-strain curves of silicone rubber under dynamic impact,four pulse shapers of purple steel,cardboard,tape,and lead blocks were experimentally tested,selecting a suitable pulse shaper for the silicone rubber SHPB experiment to address the issue of early non-uniform deformation in the samples.Silicone rubber was subjected to impact experiments under four air pressure levels:0.1 MPa,0.2 MPa,0.3 MPa,and 0.4 MPa,testing its dynamic impact performance.A visco-hyperelastic constitutive model under high strain rates was established using the Mooney-Rivlin hyperelastic model and a single Maxwell model.The results showed that lead blocks were the most suitable pulse shaper,effectively extending the falling edge time of the incident wave while filtering out high-frequency oscillations.The mechanical properties of silicone rubber were tested at strain rates between 1 811～3 433 s-1,showing typical viscoelastic characteristics with strain rate strengthening.The constitutive model curve closely matched the experimental results,accurately representing the impact mechanical properties of silicone rubber at high strain rates,providing a foundation for future research and engineering design.
万方数据
维普
