SECONDARY EXPLOSIVE SAFETY MODELS

Secondary Explosives Safety Models

FRANG

FRANG was developed by the NCEL to compute the gas pressure and impulse vs. time resulting from an explosion within a room. The model was based on the results of series of explosive tests and calculates the change in internal pressure of a room, accounting for venting through frangible panels. The results of the FRANG model in conjunction with the SHOCK model outputs provide key input data needed to execute MUDEMIMP.

MUDEMIMP

The Multiple Debris Missile Impact Simulation model, developed by the Naval Civil Engineering Laboratory (NCEL), is a ground safety tool used to determine hazardous debris distances for accidental explosions within buildings. It utilizes the SHOCK and FRANG models to assist in determining the building debris produced from internal explosions and the debris velocities, and then propagates the debris to impact thus identifying the distances hazardous debris can reach.

SHOCK

The SHOCK code, also developed by the NCEL, is a blast load analysis program which calculates the impulse and pressure loads from an explosion on a blast surface. It performs the calculations for all or part of the blast surface and models effects from both the incident wave and the reflected waves from other surfaces. The output from this program is commonly used as input for the MUDEMIMP and FRANG models.

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