|
»Click here to display Table of Contents«
|
Element Time Step (/DT) |
|
|
|
|
|
Element Time Step (/DT) |
|
|
|
|
|
»Click here to display Table of Contents«
|
Element Time Step (/DT) |
|
|
|
|
|
Element Time Step (/DT) |
|
|
|
|
Element time step is used by default, but a different scale or minimum time step can be used for different element types with the following keywords:
| /DT/BRICK | define  and  for solid bricks |
| /DT/QUAD | define and for 2D solid quads |
| /DT/SHELL | define and for 4-node shells |
| /DT/SH_3N | define and for 3-node shells |
| /DT/TRUSS | define and for trusses |
| /DT/BEAM | define and for beams |
| /DT/SPRING | define and for springs |
| /DT/AIRBAG | define and for airbags |
To stop the computation when is reached, use:
| /DT/BRICK/STOP | Default option |
| /DT/QUAD/STOP | Default option |
/DT/SHELL/STOP
/DT/SH_3N/STOP
/DT/BEAM/STOP
/DT/TRUSS/STOP
/DT/AIRBAG/STOP
To delete the element with a time step smaller than , use:
/DT/BRICK/DEL
/DT/QUAD/DEL
| /DT/SHELL/DEL | Default option |
| /DT/SH_3N/DEL | Default option |
/DT/BEAM/DEL
/DT/TRUSS/DEL
To switch to a small strain formulation after reaching , use:
| /DT/BRICK/CST | For some solid material law the sound speed is |
| | pressure dependent. It is therefore possible that the |
time step becomes slightly smaller than .
/DT/SHELL/CST
/DT/SH_3N/CST
A time step control on an interface kinematic time step can be applied in the case of an element time step. These conditions can be applied, in addition to other element time step controls:
/DT/INTER/DEL
With this option, if a kinematic interface time step becomes smaller than , the concerned impacted node is deleted from the interface.
A second interface time step control is available in the case of an element time step:
/DT/INTER/CST
This option works like /DT/NODA/CST. If a nodal time step of impacted nodes reaches , a mass is added to the node so that the time step remains constant.
|