O-084 NIMIC Nations collaborative Efforts in Shock Modelling - Reactive Models for Hydrocode: Past, Present & Future

It has been known for more than fifty years that the initiation and detonation of heterogeneous explosives is affected by the behaviour of density discontinuities and other defects. Mathematical models to describe this reactive behaviour are almost as old.

Nevertheless, as there still is lack of knowledge about the microscopic phenomena that affect hot spot formation, initiation, and burn (how much material corresponds to hot spots after initial shock loading, what is the temperature range of these hot spots, how do material microstructure and loading conditions affect hot spot formation,), and as the associated time and length scale is exceedingly short to be accurately modeled, realistic descriptions are still not available to hydrocode users.

Following discussions initiated during the NIMIC workshop entitled Small-Scale Testing and Modelling (January 2000), NIMIC proposed to the community to create a group of experts including model developers and code users. Created in June 2001, this group of almost 40 experts now, compiled work conducted and being conducted in the NIMIC nations in the field of shock initiation modelling. More than 30 models have been reviewed mainly using the Internet as a media. Results of the discussion are now available in a NIMIC document entitled NIMIC Nations Collaborative Efforts in Shock Modelling-Reactive Models for Hydrocodes: Past, Present and Future.

The Objective of this document is to present to the community the results of this review, some identified shortcomings and recommendations for the future.