Safety Management Services, Inc. (SMS) is experienced in utilizing DoD BlastX software to analyze the deflagration and/or detonation of energetic materials in multi-room structures for shock wave reflection and gas pressures.
A maximum credible event (MCE) is determined for the room or building using established hazards analysis methodologies. The room is then modeled in BlastX, including openings, wall construction, MCE charge weights, and MCE charge locations. BlastX can be used to model rooms that are parallelepiped (6 walls, rectangular), L-shaped (8 walls), regular and irregular cylinders (up to 30 walls each), general (at least 1 wall), and tunnel venting.
By default, the construction of the rooms are considered robust (indestructible). “Openings” within the room model are used to specify the construction of walls and openings that can fail (destructible). Wall failure can be specified using either the FACEDAP code (open, concrete 2-way slab, masonry reinforced/unreinforced one-way or two-way walls, metal stud walls, or glass) or user defined (pressure-time or impulse-pressure models). Openings are also used by BlastX to define how rooms are interconnected, enabling analysis of multi-room structures.
Charge locations are displayed in the modeled room as a red circle; targets (i.e. pressure probes/sensors) appear as blue squares. Charge details are customizable, including explosive weight, detonation delay, charge shape (spherical or cylindrical), charge casing, initial weight burned and burn rate, charge composition, and parameters for evaluating sympathetic detonation. Multiple charges can be specified in each room.
Once all parameters have been specified, BlastX analyzes the specified configuration for shock reflections and/or venting.
In conjunction with BlastX, SMS is experienced in using TM 5-1300 / UFC 3-340-02, “Structures to Resist the Effects of Accidental Explosions” and DOE TIC-11268, “A Manual for the Prediction of Blast and Fragment Loadings on Structures” to determine blast, fragment, and shock loads. SMS also has experience using many other computer simulations, including ConWep, SHOCK, FRANGE, etc. Finite element analysis is an additional option.