Methodology to Simulate IM Response of a Pyro Equipment

The current work is focused on Bullet Impact Threat, that consists of the prediction the energetic response inside a pyro component when hit by a 12,7 AP bullet, in accordance with the test procedures described in design standardization documents. Reaction of a munition to the bullet impact stimulus occurs because there is either direct shock initiation or ignition of damaged energetic material as the bullet passes through or lodges in the material. The starting point of the work was the collection of the various NATO publications to understand which tests are carried out, how and the various definitions. Then moved on to a study through literature research of the way in which to describe the reaction grade of the Energetic Material subject to the shock initiation, so a specific equation of state called “Ignition and growth of reaction in HE”. The analysis has been carried out exploiting the capabilities of the commercial hydrocode LS-DYNA, widely used in Aerospace and Defense fields. Different scenarios have been evaluated let varying the velocity of the bullet, all in accordance with the test requirements prescribed by NATO publications. To compare the results and then define the reaction grade can be used a customized analytical tool called Split-X, an expert system for the design and assessment of fragmenting warheads.