LSDA (binout) File
LSDA (binout) File
| Stress | By default stress tensors are in the local element coordinate system. Values are written out for all the through thickness and in-plane integration points. |
| Strain | The Strain tensors output is optional. By defaul the values are in the local element coordinate systems and only values at the top and bottom integration points are output. T/HIS will average these values for the mid surface. |
| Forces & Moments | These are not written to the LSDA file. |
| Extra | By default "Extra" data components are not written to the LSDA file. Some recent versions of Ansys LS-DYNA can now write the"Extra" data components to the LSDA file if the parameters OPTION1, OPTION2, OPTION3 and OPTION4 are set on the *DATABASE_ELOUT card. |
Global v Local coordinate system results
The LSDA file can contain both ELOUT and ELOUTDET data components. By default T/HIS uses the data from ELOUTDET as ELOUT only contains a subset of the data in ELOUDET.
In some versions of Ansys LS-DYNA it is possible to change the Shell and ThickShell data components written to the ELOUT so that they are defined using the Global coordinate system (see EOCS on *CONTROL_OUTPUT) instead of the default local element coordinate system If this option is used then only the ELOUT file is modified, the ELOUDET file is still written using the local element coordinate system.
If T/HIS detects that the LSDA file contains both ELOUT and ELOUDET and that they are using different coordinate systems then T/HIS will display an additional option can be used to force T/HIS to use the ELOUT file data instead of the ELOUTDET data.
Through Thickness Integration Points (surfaces/layers)
Unlike the THF file the LSDA file can contain different numbers of integration points for each element. This means that if "Top" surface is selected T/HIS can correctly identify which integration point it needs to read data from.
By default strain tensors are only written out for the top and bottom surfaces and T/HIS averages these for the mid surface values. In recent versions of Ansys LS-DYNA the parameter INTOUT on the *DATABASE_EXTENT_BINARY card can change this so that strain tensor values are written out for all the through thickness integration points. T/HIS does not currently support these additional values.
In-plane Integration Points
By default the LSDA file will contain data for all 4 in-plane integration points for any fully integrated shells. As with the THF file by default there is no information in the LSDA file to tell the difference between a shell with 32 through thickness integration points and a shell with 8 through thickness layers and 4 in-plane points per layer. If a ZTF file written by PRIMER is present then T/HIS can use the extra information on the ZTF to work out which elements have multiple in-plane points.
If the parameter INTOUT on the *DATABASE_EXTENT_BINARY card is set then the format of the LSDA file is changed and the LSDA file then contains enough information for T/HIS to identify the shells with multiple in-plane integration points without the ZTF file.
In addition to changing the format of the LSDA file setting INTOUT on the *DATABASE_EXTENT_BINARY card also outputs strain tensor values at each in-plane integration point as well as all the through thickness layers. T/HIS does not currently support strain values from multiple in-plane integration points.
Extrapolated Stress / Strain Values
The parameter NODOUT on the *DATABASE_EXTENT_BINARY card "gaa" can be used to generate stress and strain values that have been extrapolated to the nodal positions instead of values at the elements integration points. T/HIS does not currently support these extrapolated values.