JWLPlusPlus Material
Constitutive Law
This MPM material is a programmed-burn model for simulating certain detonation scenarios.
Material Properties
The properties for a Tait liquid are:
| Property | Description | Units | Default |
|---|---|---|---|
| time0 | Detonation start time | time units | 0 |
| StartX | Detonation starting x position | length units | 0 |
| StartY | Detonation starting y position | length units | 0 |
| StartZ | Detonation starting z position | length units | 0 |
| NormX | Planar wave normal in x direction | length units | 0 |
| NormY | Planar wave normal in y direction | length units | 0 |
| NormZ | Planar wave normal in z direction | length units | 0 |
| Dv | Detonation velocity | alt velocity units | none |
| Dw | Detonation front width. The extent of reaction of these particle goes from 0 to 1 over a length equal to this width. The time for a given partile to burn once it starts is thus Dw/Dv. | length units | none |
| DeleteDist | Particle deletion distance. If a particle is greater than this distance from the starting location (for spherical wave) or starting plane (for planar wave), the particle is deleted from the simulation. | length units | none |
| nm | none | none | |
| Ajwl | pressure units | none | |
| Bjwl | pressure units | none | |
| Cjwl | pressure units | none | |
| R1 | none | none | |
| R2 | none | none | |
| Omega | none | none | |
| (other) | Properties common to all materials | varies | varies |
History Variables
This material tracks two history variables:
- J or the volumetric strain (i.e., the determinant of the deformation gradient).
- Fraction reacted. The fracture reacted is zero for particle ahead of the detonation wave front, one behind in, and transitions for zero to one across the detonation wave front defined by the Dw material property.
Examples
The following commands are for water for scripted or XML input files