2022

2022

/DT1/SHELL

Engine Keyword Alternative time step calculation method for shell elements which results in a lower more accurate time step than the default calculation method.

Format

/DT1/SHELL/Keyword3

$Δ T_{s c a}$ $Δ T_{s c a}$ $Δ T_{min}$ $Δ T_{\min}$

Definitions

Field	Contents	SI Unit Example
`Keyword3`	Time step control type: `CST` Elements are switched to small strain formulation to maintain the constant time step $Δ T_{min}$ $Δ T_{\min}$ . Only valid for certain values of `I`_smstr as defined in element properties. `DEL` The element which is controlling the time step is removed, so the constant time step, $Δ T_{min}$ $Δ T_{\min}$ can be maintained. `STOP` The run will stop if the time step reaches $Δ T_{min}$ $Δ T_{\min}$ and a restart file will be written.
$Δ T_{s c a}$ $Δ T_{s c a}$	Scale factor on time step. Default = 0.9
$Δ T_{min}$ $Δ T_{\min}$	Minimum time step.

Comments

This option activates a lower and thus more conservative time step calculation method for shell elements; otherwise, this option is identical to /DT/SHELL.