The Tool Loads panel allows you to apply a force load to a rigid body tool.
| • | tool force: total force that acts on the center of mass of a rigid tool |
The following text applies only to LS-DYNA:
Rigid body stoppers can be activated by activating the stoppers check box. In reality, the tooling is generally a massive structure that has relatively large forces applied. In simulation, the tooling is modeled using a relatively thin structure with little mass. As a result, the dynamic response of such a system may be quite different from what would happen in reality. To help minimize the dynamic effects, stoppers can be used to limit the motion of the tool.
The following are input parameters for the rigid body stoppers:
Option
|
Description
|
birth time
|
time at which the stopper gets enabled
|
max displace
|
upper displacement limit for rigid body
|
min displace
|
lower displacement limit for rigid body
|
max velocity
|
maximum velocity limit for rigid body
|
The *CONSTRAINED_RIGID_BODY_STOPPERS card is created when the stoppers option is enabled.
How do I…
In the Incremental_RADIOSS user profile:
| 1. | Click tool = and select the tool component to apply the force load. |
| 2. | Click tool force and enter the tool force in Newtons (N). |
| 3. | Be sure to specify whether the force is acting in the negative or positive direction. |
| 4. | Select the direction the force load is acting. |
In the Incremental_Dyna user profile:
| 1. | Click tool = and select the tool component to apply the force load. |
| 2. | Click tool force and enter the tool force in Newtons (N). |
| 3. | Be sure to specify whether the force is acting in the negative or positive direction. |
| 4. | Click birth time and enter the time at which the load is to be applied. If the load is applied at the very beginning, enter zero. |
| 5. | Select the direction the force load is acting. |
|
Rigid body stoppers are used to constrain a rigid body in simulations in which a binder might move as a result of an initial force that is applied to it.
| 1. | On the Tool Loads panel, click tool = and select the tool component to apply the force load. |
| 2. | Click tool force and enter the tool force in Newtons (N). |
Be sure to specify whether the force is acting in the negative or positive direction.
| 3. | Click birth time and enter the time at which the load is to be applied. If the load is applied at the very beginning, enter zero. |
| 4. | Select the stoppers check box. |
| 5. | Enter a value for any or all of the following to enable the corresponding rigid body stopper: |
| • | max displace – maximum displacement that the part is allowed (set to a small, non-zero value) |
| • | min displace – minimum displacement of the part |
| • | max velocity – set to the velocity of the prescribed motion + 10 percent to adjust for wrinkling or thinning that may occur between the blank and binder; set this value to minimize the inertial effects on the binder if the binder moves excessively |
| 6. | Select the direction the force load is acting. |
|
See also
Alphabetical List of Panels
LS-DYNA User’s Manual
