/DT/SHNOD/Keyword3
Engine Keyword Time step control for shell subcycling.
Format
/DT/SHNOD/Keyword3
$\text{\Delta}{T}_{sca}$ $\text{\Delta}{T}_{\mathrm{min}}$
Definitions
Data  Description  SI Unit Example 

Keyword3  Time step control
type.
If Keyword3 is not specified, i.e. /DT/SHNOD, then the shell elements will use the nodal time step method and is not used. 

$\text{\Delta}{T}_{sca}$  Scale factor on nodal
stability time step for shells. Default = 0.9 

$\text{\Delta}{T}_{\mathrm{min}}$  Minimum time step. 
Comments
 Shell subcycling is activated by using the Engine file option, /SHSUB.
 /DT/SHNOD/CST can be set in the Radioss Engine file, to use an imposed nodal time step
for SHELL and SH3N elements subcycling.
Just like /DT/NODA/CST, mass will be added to maintain
$\text{\Delta}{T}_{\mathrm{min}}$
.
(1) is lower than $\text{\Delta}{T}_{\mathrm{min}}$$$\text{\Delta}{T}_{\mathit{sca}}\cdot \sqrt{2\frac{M}{\mathit{Ksh}}}$$  /DT/SHNOD sets a different time step for all shells (SHELL and SH3N) and shells only. Time step parameters of the rest of the model are defined in /DT/NODA. /DT/NODA is required, if /DT/SHNOD is used.