Abstract: To systematically study the tensile mechanical properties of ionomer interlayer at medium-to-high strain rates and different temperatures, dynamic tensile tests are performed at 1 s⁻¹~800 s⁻¹ and −40 ℃~60 ℃. Based on the experimental results, key mechanical parameters are identified, and the effects of temperature and strain rate are analyzed. As the strain rate increases or the temperature decreases, the initial elastic modulus, yielding strength and failure strength increase but the failure strain decreases. Based on G’SELL model, the model parameters are calibrated and validated against the test results. Adopting a stress-compensation method, the paper develops a user subroutine to introduce the proposed constitutive equation into the LS-DYNA software. The effectiveness of the user subroutine is validated through the comparison between numerical and test results.