Transient loads
In an Event Simulation study, you set up the analysis to simulate a load changing with time, for example, a bullet travelling through an object, or an axe cutting through wood. The load is a transient load, the amplitude of which changes with time. You specify a duration for the simulation and provide amplitude curves that describe the transient load and prescribed displacement boundary conditions over that duration.
In event simulation analyses, all loads are treated as if they were transient. If no time-dependent curve is defined, then the load is applied instantaneously at time zero and held constant throughout the duration of the event. When no time dependent curve is defined, the applied load causes a sudden shock to the system.
For example, in your analysis you may want to load your model up to some prescribed value and then unload it back to zero. This simulation would use two steps.
Figure 1: Load/unload problem with a linear up/down ramp.
| Load | Applies to... | Used to... |
|---|---|---|
 Transient Force |
Faces, Edges, or Vertices. | Apply a transient force to change the state or direction of motion of a body. |
 Transient Pressure |
Faces (single or multiple) | Apply a pressure (force per unit area) to a defined area. Pressure is:
|