Calibration for Lee‐Tarver Ignition and Growth Model Parameters of 3,4‐Bis(3‐nitrofurazan‐4‐yl) Furoxan Explosive

ABSTRACT

In order to calibrate Lee‐Tarver ignition and growth model parameters for the shock initiation process of 3,4‐bis(3‐nitrofurazan‐4‐yl) furoxan (DNTF) explosive, the Euler‐Lagrange fluid‐structure coupling model was established using AUTODYN software. The Lee‐Tarver ignition and growth model was employed to characterize the detonation process, with key parameters calibrated through Lagrange experimental data and EXPLO‐5 software calculations. A triple quantitative validation framework was implemented for parameter optimization: (1) Rapid convergence of reaction degree‐time curves to complete detonation state (λ ≥ 0.99); (2) The relative error of the peak pressure is less than 10% in combination with the results of simulation experiment and Lagrange experiment; (3) Pearson correlation coefficient (r) of pressure‐time history curve is not less than 0.9. The Simulation results demonstrate that the model accurately reproduces detonation propagation: The average relative error between simulated and experimental pressure peaks was 3.3%, with the minimum Pearson correlation coefficient of pressure‐time history curves reaching 0.921. At the steady detonation stage, the reaction degree at monitoring points reached complete detonation (λ ≥ 0.99) within 0.52µs. The prediction error of detonation velocity is controlled within 2.86%. The attenuation of pressure on both sides of the axis of the DNTF explosive is negatively correlated with the reaction delay time. Internal energy is redistributed through detonation wave transfer. The calibrated Lee‐Tarver ignition and growth model parameters provide critical data support for engineering applications of DNTF explosives.