An Improved Method for Effective Charge Division in EFP and Experimental Study on Small‐Sized EFP Forming

The velocity of explosively formed penetrators (EFPs) serves as a critical metric for assessing their terminal effectiveness. Traditional velocity calculation methods, which approximate the liner as a flat plate to partition the effective charge, systematically underestimate velocities due to neglected charge volume displacement caused by liner curvature. This study addresses this limitation by proposing a revised effective charge model that incorporates curvature compensation. Validation through pulsed X‐ray experiments on 14 mm diameter charges demonstrates strong agreement between the experimental results and the new model’s predictions. The predicted jet tip velocities agree with the measured values to within 5% relative error, cutting the historical 10% deviation of conventional models in half and removing the enduring inaccuracy in velocity estimation that has hindered EFP design.