LCOPER
LCOPER, Oper,
LCASE1, Oper2,
LCASE2,SweepANG
Performs load case operations.
OperValid operations are:
ZERO
—
Zero results portion of database (
LCASE1ignored).SQUA
—
Square database values (
LCASE1ignored).SQRT
—
Square root of database (absolute) values (
LCASE1ignored).LPRIN
—
Recalculate line element principal stresses (
LCASE1ignored). Stresses are as shown for the NMISC items of the ETABLE command for the specific line element type.ADD
—
Add
LCASE1to database values.SUB
—
Subtract
LCASE1from database values.SRSS
—
Square root of the sum of the squares of database and
LCASE1.MIN
—
Compare and save in database the algebraic minimum of database and
LCASE1.MAX
—
Compare and save in database the algebraic maximum of database and
LCASE1.ABMN
—
Compare and save in database the absolute minimum of database and
LCASE1(based on magnitudes, then apply the corresponding sign).ABMX
—
Compare and save in database the absolute maximum of database and
LCASE1(based on magnitudes, then apply the corresponding sign).LCASE1First load case in the operation (if any). See
LCNOof the LCDEF command. If ALL, repeat operations using all selected load cases (LCSEL).Oper2Valid operations are:
MULT
—
Multiplication:
LCASE1*LCASE2CPXMAX
—
This option does a phase angle sweep to calculate the maximum of derived stresses, equivalent strain, and principal strains for a complex solution where
LCASE1is the real part andLCASE2is the imaginary part. TheOperfield is not applicable with this option. Also, the LCABS and SUMTYPE commands have no effect on this option. The value of S3 will be a minimum. Absolute maximum is obtained for component quantity. This option does not apply to derived displacement amplitude (USUM). Load case writing (LCWRITE) is not supported. See POST1 and POST26 – Complex Results Postprocessing in the Theory Reference for more information.LCASE2Second load case. Used only with
Oper2operations.SweepANGSweep angle increment in degrees for phase sweep. Used only with
Oper2= CPXMAX. (Default = 1°)
Notes
LCOPER operates on the database and one or two load cases according to:
Database = Database Oper
(LCASE1
Oper2
LCASE2) |
where operations Oper and Oper2 are as
described above.
Absolute values and scale factors may be applied to the load cases before the
operations (LCABS, LCFACT). If
LCASE1 is not specified, only operation
Oper is performed on the current database. If
LCASE2 is specified, operation
Oper2 is performed before operation Oper. If
LCASE2 is not specified, operation
Oper2 is ignored.
Solution items not contained (OUTRES) in either the database or the applicable load cases will result in a null item during a load case operation. Harmonic element data read from a result file load case are processed at zero degrees.
Load case combinations must be performed on load cases from the same results file. Combining load cases from different results files is not supported.
Load case combinations of element-based solutions are performed
in the solution coordinate system, and the data resulting from load case combinations
are stored in the solution coordinate system. The resultant data are then transformed to
the active results coordinate system (RSYS) when listed or displayed.
Except in the cases of Oper = LPRIN, ADD, or SUB,
you must use RSYS,SOLU to list or display results. In the case of
layered elements, the layer (LAYER) must also be
specified.
If nodal-averaged results are a part of the load case combination, the resulting nodal-averaged result data are in the global Cartesian coordinate system. Furthermore, the resulting numerical values may differ from the same LCOPER operation performed on the same data stored as element results. The SQUA, SQRT, LPRIN, and SRSS operations are not valid when applied to nodal averaged results. For more information, see Nodal-Averaged Results in the Element Reference.
Use the FORCE command prior to any combination operation to correctly combine the requested force type.
If Oper2=CPXMAX, the derived stresses and strain calculation do not apply to line elements.
For details on using load case combination, see Creating and Combining Load Cases in the Basic Analysis Guide.
For cyclic symmetry (CYCLIC), LCOPER operates on the raw base and duplicate sector values. It cannot be used on the expanded values (/CYCEXPAND).