Fragment velocity formula for reverse detonation driving in opposite initiation

摘要

In the problems of detonation driving, the explosive charge is usually initiated in one side and drives the fragment or plate located in the other side. This driving style has lots of studies and practical applications, but less studies is done in the reverse detonation driving, where the initiation point is located at the same side of the fragment. The reverse detonation driving can lower the shock pressure in the fragment and solve the problem of spallation. The model of opposite initiation of cylindrical charge is used to study the reverse detonation driving in this work. A long element is taken along the direction of initiation points and the warhead center, and a fragment velocity formula is established according to the one dimensional gas dynamics. Then, considering the influences of assumptions like rigid constraint of the element, three experimentally verified numerical modeling are used to validate the established formula. The ratios of the formula computations and the corresponding modeling results have the almost same trends. Therefore, the similar trend are fitted together and used as correction factor of the established formula. The established formula can be used as a good reference for the problem of reverse detonation driving.