lcoper

Mapdl.lcoper(oper='', lcase1='', oper2='', lcase2='', **kwargs)

Performs load case operations.

APDL Command: LCOPER

Parameters:

oper

Valid operations are:

ZERO

Zero results portion of database (LCASE1 ignored).

SQUA

Square database values (LCASE1 ignored).

SQRT

Square root of database (absolute) values (LCASE1 ignored).

LPRIN

Recalculate line element principal stresses (LCASE1 ignored). Stresses are as shown for the NMISC items of the ETABLE command for the specific line element type.

ADD

Add LCASE1 to database values.

SUB

Subtract LCASE1 from 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).

lcase1

First load case in the operation (if any). See LCNO of the LCDEF command. If ALL, repeat operations using all selected load cases [LCSEL].

oper2

Valid operations are:

MULT

Multiplication: LCASE1*LCASE2

CPXMAX

This option does a phase angle sweep to calculate the maximum of derived stresses and equivalent strain for a complex solution where LCASE1 is the real part and LCASE2 is the imaginary part. The Oper field 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. 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 Mechanical APDL Theory Reference for more information.

lcase2

Second load case. Used only with Oper2 operations.

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 will be 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. All load case combinations 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, and in the case of layered elements, the layer (LAYER) must also be specified.

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.