Mesoscale Mechanics of Reactive Materials for Enhanced Target Effects.

摘要

Reactive material composed of tungsten and aluminum are investigated computationally with respect to their suitability as warhead materials. The objective is to identify a material that has sufficient strength to survive the explosive launch from the warhead, has the capability of perforating a target, and fragments into fine particles upon target perforation, thereby enabling a combustion reaction. The considered materials are modelled on the mesoscale, i.e. by resolving the granular structure. Mesoscale simulations are carried out for a variety of different microstructures under explosive and impact loading. The simulation results are evaluated with respect to the fragment size distributions and relations between mesoscale parameters, launch and impact conditions and fragmentation characteristics are deduced. The simulations make use of a scaling on the macro-scale which is necessary to reduce the computational effort to a feasible amount. The validity of the scaling approach is analyzed. A suitable material is suggested.