During the last 5 years NIMIC has organised a series of Workshops for its nations on IM threat stimuli. These workshops have covered Bullet/Fragment Impact, Cookoff (Slow and Fast), Sympathetic Reaction and Shaped Charge Jet Impingement.
In March 1993, NIMIC prepared a compilation of formulations for insensitive munitions, together with their performance and safety characteristics. This document (Ref. NIMIC-MD-168-93) was originally published as "Confidential", and subsequently downgraded after a few minor modifications.
In 1997 NIMIC held a Workshop on IM Testing the aim of which was "to write guidance on full-scale IM testing in order to improve confidence in and achieve international acceptability and broader applicability of test results".
This paper seeks to define the term "modelling". It then assesses the physico-chemical environment which needs to be modelled. Some technical models are examined and their deficiencies noted. The requirements for the modelling of initiation are sketched in.
This paper is intended to set the scene and to highlight issues of which an understanding is essential in order to aid development of techniques to predict the response of energetic materials in munitions subjected to thermomechanical stimuli. There are two main problems: