CDSMETH – Run Control
Description
The CDSMETH command can be used in component dynamic synthesis method for generating component dynamic matrices at each loading frequency.
Format
CDSMETH = CDSID Example
CDSMETH = 10
Argument Option Description
CDSID <INTEGER> Default = NONE
ID of CDSMETH in bulk data section.
Comments
1. If CDSMETH is specified, only one subcase is allowed. The data corresponding to component dynamic synthesis will be stored in an H3D file with the name,
filename_CDS.h3d.
2. The subcase must be a modal frequency response subcase, except it does not require a DLOAD card for load specification.
CHECK
I/O Options Entry CHECK - Run Control
Description
The CHECK command can be used in the I/O Options section to request that only a model check be performed.
Format CHECK Comments
1. Perform model check only.
2. If this keyword is present, only the subroutines which read in the input files are executed. A report that provides information on errors in the model and the memory and disk space requirements is given.
3. Useful for large runs since the amount of memory and time required to perform this function is very small.
CMDE
I/O Options Entry CMDE - Output Request
Description
The CMDE command can be used above the first SUBCASE or within a SUBCASE definition to request component modal synthesis damping energy output for all subcases or individual subcases respectively.
Format
CMDE(format_list,THRESH=thresh,RTHRESH=rthresh,TOP=topn,MODES=mset,TYPE=type) = option
Argument Options Description
format <H3D, blank> Default = blank
H3D: Results are output in Hyper3D
format (.h3d file).
blank: Results are output in all active formats for which the result is available.
thresh <Real> No default
Specifies an absolute threshold under which results should not be output.
rthresh <Real> No default
Specifies a relative threshold under which results should not be output. This value is relative to the corresponding total modal energy.
topn <Integer> No default
Specifies that only the top N values should be output.
Argument Options Description
type <AVERAGE,
AMPLITUDE, PEAK> Default = AVERAGE
AVERAGE: The average of the energy is output.
AMPLITUDE: The amplitude of the energy is output.
PEAK: The peak energy is output. This
is the sum of AVERAGE and AMPLITUDE.
mset <ALL, SID, TOTAL> Default = ALL
ALL: Modal energy is output for all
modes.
SID: If a set ID is given, modal energy
is output only for modes listed in that set.
TOTAL: Only the total energy is output.
option <YES, ALL, NO, NONE>
Default = ALL
YES, ALL, blank: Modal energy is output.
NO, NONE: Modal energy is not output.
Comments
1. When the CMDE command is not present, component modal synthesis damping energy is not output.
2. Component modal synthesis damping energy output is only available for frequency
response analysis (both direct and modal methods). It is intended for use when external CMS superelements are used.
3. Multiple formats are allowed on the same entry; these should be comma separated. If no format is specified, then this output control applies to all formats defined by OUTPUT or FORMAT commands for which the result is available. See Results Output for information on which results are available in which formats.
4. Multiple instances of this card are allowed; if instances are conflicting, the last instance dominates.
5. For optimization, the frequency of output to a given format is controlled by the I/O option OUTPUT. In previous version of OptiStruct, a combination of the I/O options FORMAT and RESULTS were used; this method is still supported, but not recommended as it does not allow different frequencies for different formats.
CMKE
I/O Options Entry CMKE - Output Request
Description
The CMKE command can be used above the first SUBCASE or within a SUBCASE definition to request component modal synthesis kinetic energy output for all subcases or individual subcases respectively.
Format
CMKE(format_list,THRESH=thresh,RTHRESH=rthresh,TOP=topn,MODES=mset,TYPE=type) = option
Argument Options Description
format <H3D, blank> Default = blank
H3D: Results are output in Hyper3D
format (.h3d file).
blank: Results are output in all active formats for which the result is available.
thresh <Real> No default
Specifies an absolute threshold under which results should not be output.
rthresh <Real> No default
Specifies a relative threshold under which results should not be output. This value is relative to the corresponding total modal energy.
topn <Integer> No default
Specifies that only the top N values should be output.
Argument Options Description
type <AVERAGE,
AMPLITUDE, PEAK> Default = AVERAGE
AVERAGE: The average of the energy is output.
AMPLITUDE: The amplitude of the energy is output.
PEAK: The peak energy is output. This
is the sum of AVERAGE and AMPLITUDE.
mset <ALL, SID, TOTAL> Default = ALL
ALL: Modal energy is output for all
modes.
SID: If a set ID is given, modal energy
is output only for modes listed in that set.
TOTAL: Only the total energy is output.
option <YES, ALL, NO, NONE>
Default = ALL
YES, ALL, blank: Modal energy is output.
NO, NONE: Modal energy is not output.
Comments
1. When the CMKE command is not present, component modal synthesis kinetic energy is not output.
2. Component modal synthesis kinetic energy output is only available for frequency response analysis (both direct and modal methods). It is intended for use when external CMS superelements are used.
3. Multiple formats are allowed on the same entry; these should be comma separated. If no format is specified, then this output control applies to all formats defined by OUTPUT or FORMAT commands for which the result is available. See Results Output for information on which results are available in which formats.
4. Multiple instances of this card are allowed; if instances are conflicting, the last instance dominates.
5. For optimization, the frequency of output to a given format is controlled by the I/O option OUTPUT. In previous version of OptiStruct, a combination of the I/O options FORMAT and RESULTS were used; this method is still supported, but not recommended as it does not allow different frequencies for different formats.
CMSE
I/O Options Entry CMSE - Output Request
Description
The CMSE command can be used above the first SUBCASE or within a SUBCASE definition to request component modal synthesis strain energy output for all subcases or individual subcases respectively.
Format
CMSE(format_list,THRESH=thresh,RTHRESH=rthresh,TOP=topn,MODES=mset,TYPE=type) = option
Argument Options Description
format <H3D, blank> Default = blank
H3D: Results are output in Hyper3D
format (.h3d file).
blank: Results are output in all active formats for which the result is available.
thresh <Real> No default
Specifies an absolute threshold under which results should not be output.
rthresh <Real> No default
Specifies a relative threshold under which results should not be output. This value is relative to the corresponding total modal energy.
topn <Integer> No default
Specifies that only the top N values should be output.
Argument Options Description
type <AVERAGE,
AMPLITUDE, PEAK> Default = AVERAGE
AVERAGE: The average of the energy is output.
AMPLITUDE: The amplitude of the energy is output.
PEAK: The peak energy is output. This is the sum of AVERAGE and
AMPLITUDE.
mset <ALL, SID,
TOTAL> Default = ALL
ALL: Modal energy is output for all
modes.
SID: If a set ID is given, modal energy is output only for modes listed in that set.
TOTAL: Only the total energy is output.
option <YES, ALL, NO,
NONE>
Default = ALL
YES, ALL, blank:
Modal energy is output.
NO, NONE: Modal energy is not output.
Comments
1. When the CMSE command is not present, component modal synthesis strain energy is not output.
2. Component modal synthesis strain energy output is only available for frequency response analysis (both direct and modal methods). It is intended for use when external CMS superelements are used.
3. Multiple formats are allowed on the same entry; these should be comma separated. If no format is specified, then this output control applies to all formats defined by OUTPUT or FORMAT commands for which the result is available. See Results Output for information on which results are available in which formats.
4. Multiple instances of this card are allowed; if instances are conflicting, the last instance dominates.
5. For optimization, the frequency of output to a given format is controlled by the I/O option OUTPUT. In previous version of OptiStruct, a combination of the I/O options FORMAT and RESULTS were used; this method is still supported, but not recommended as it does not allow different frequencies for different formats.
CONTF
I/O Options and Subcase Information Entry CONTF – Output Request for Contact Results
Description
The CONTF entry can be used in the I/O Options or Subcase Information sections to request contact results output for all nonlinear analysis subcases or individual nonlinear analysis subcases respectively.
Format
CONTF (format, type) = option
Type Options Description
format <H3D, OPTI, blank>
Default = blank
H3D: Results are output in Hyper3D format (.h3d file). See below for type. OPTI: The total contact force results are
output to the .cntf file. blank: Results are output in all active
formats for which the result is available.
type <ALL,FORCE, PCONT,FRICT> Default = ALL
ALL: All available contact results types are output.
FORCE: Contact force results are output.
PCONT: Pressure-type contact results are output: pressure, open-closed status, contact gap opening and penetration (see comment 2). FRICT: Friction-related results are output:
frictional traction, sliding distance, and stick-slip status (see comment 2).
Type Options Description
NO, NONE, SID>
Default = ALL
blank: points.
NO, NONE: Contact results are not output.
SID: If a set ID is given, contact results are output only for grid points listed in that set.
Comments
1. The CONTF entry is only applicable in nonlinear analysis subcases that are identified by the presence of an NLPARM subcase entry. The specific detailed result types displayed differ slightly between NLSTAT and geometrically nonlinear subcases.
2. Most of the contact results are real numbers and are self-explanatory. Some results that may require clarification are listed below:
Open/Closed status is represented by 0.0 for Open and 1.0 for Closed. On graphical display, intermediate values may appear due to transition from open to closed across individual elements,
Slip/Stick Status is represented by 0.0 for Open, 1.0 for Slip and 2.0 for Stick. On graphical display, intermediate values may appear due to transition of status across individual elements,
Sliding Distance represents total sliding distance accumulated while the surfaces are in contact. This may be different than just the difference in displacements between the starting and final position.
3. The calculation of contact results on both sides of contact interface involves projections and mappings. Therefore, a perfect match of results between two sides cannot be expected, especially on mismatched meshes. Also, the resolution of different types of results (pressure versus gap opening) differs according to their respective FEA
interpolation order. Therefore, such results may appear locally inconsistent, especially on second order meshes and mismatched mesh densities. (Usually pressure and traction will appear smoother than gap opening or penetration.)
4. Only formats that have been activated by an OUTPUT or FORMAT statement are valid for use on this entry.
5. Multiple formats are allowed on the same entry; these should be comma separated. If no format is specified, then this output control applies to all formats defined by OUTPUT or FORMAT commands for which the result is available. See Results Output for further information.
6. Multiple instances of this entry are allowed; if the instances conflict, the last instance dominates.
CSTRAIN
I/O Options and Subcase Information Entry CSTRAIN - Output Request
Description
The CSTRAIN command can be used in the I/O Options or Subcase Information sections to request ply strain output for elements referencing PCOMP or PCOMPG properties for all subcases or individual subcases respectively.
Format
CSTRAIN (format_list,type,extras_list) = option
Argument Options Description
format <HM, H3D, OPTI, PUNCH, OP2, PLOT, blank>
Default = blank
HM: Results are output in HyperMesh
results format (.res file).
H3D: Results are output in Hyper3D
format (.h3d file).
OPTI: Results are output in OptiStruct results format (.cstr file).
PUNCH: Results are output in Nastran punch results format (.pch file).
OP2: Results are output in Nastran
output2 format (.op2 file) (see comment 10).
PLOT: Results are output in Nastran
output2 format (.op2 file) when PARAM, POST is defined in the bulk data section.
blank: Results are output in all active formats, for which the result is available.
Argument Options Description
type <ALL, PRINC> Default = ALL
ALL, blank: All strain results are output.
PRINC: Only principal strain results are output.
extras <MECH, THER> No default
MECH: Output Mechanical strain (in
addition to total strain). This output is only available for H3D format.
THER: Output Thermal strain (in addition to total strain). This output is only available for H3D format.
option <YES, ALL, NO, NONE, SID, PSID> Default = YES
YES, ALL, blank: Results are output for all elements.
NO, NONE: Results are not output.
SID: If a set ID is given, results are output only for elements listed in that set.
PSID: If a property set ID is given, results for the elements referencing
properties listed in the property set are output.
Comments
1. When the CSTRAIN command is not present, ply strain results are not output.
2. This output is not currently available for the frequency response or transient solution sequences.
3. The STRAIN I/O option controls the output of strain results for the homogenized composite material.
4. Multiple formats are allowed on the same entry; these should be comma separated. If no format is specified, then this output control applies to all formats defined by OUTPUT or FORMAT commands, for which the result is available. See Results Output for information on which results are available in which formats.
5. Multiple instances of this card are allowed; if instances are conflicting, the last instance dominates.
6. The SOUT field on the PCOMP or PCOMPG bulk data entry must be set to YES to activate strain results calculation for the corresponding ply.
7. For plies defined on a PCOMPG bulk data entry, the results are grouped by GPLYID. 8. For optimization, the frequency of output to a given format is controlled by the I/O
option OUTPUT. In previous versions of OptiStruct, a combination of the I/O options FORMAT and RESULTS were used; this method is still supported, but not recommended as it does not allow different frequencies for different formats.
9. The mechanical and thermal contributions to strain may be requested in addition to the total strain.
10. format=OUTPUT2 can also be used to request results to be output in the Nastran output2 format (.op2 file).
CSTRESS
I/O Options and Subcase Information Entry CSTRESS - Output Request
Description
The CSTRESS command can be used in the I/O Options or Subcase Information sections to request ply stress and failure index output for elements referencing PCOMP or PCOMPG properties for all subcases or individual subcases respectively.
Format
CSTRESS (format_list,type) = option
Argument Options Description
format <HM, H3D, OPTI, PUNCH,OP2, blank> Default = blank
HM: Results are output in HyperMesh results format (.res file).
H3D: Results are output in Hyper3D format (.h3d file).
OPTI: Results are output in OptiStruct results format (.cstr file).
PUNCH: Results are output in Nastran punch results format (.pch file).
OP2: Results are output in Nastran output2 format (.op2 file) (see comment 10). blank: Results are output in all active
formats, for which the result is available.
type <ALL, PRINC, FI> Default = ALL
ALL, blank: All stress results are output. PRINC: Only principal stress results are
output.
FI: Only failure index results are
output. Failure Index results are not available in the .pch and .op2 files.
Argument Options Description
Option <YES, ALL, NO, NONE, SID, PSID> Default = YES
YES, ALL, blank:
Results are output for all elements.
NO, NONE: Results are not output.
SID: If a set ID is given, results are output only for elements listed in that set.
PSID: If a property set ID is given, results for the elements
referencing properties listed in the property set are output.
Comments
1. When the CSTRESS command is not present, ply stress and failure index results are not output.
2. This output is not currently available for the frequency response or transient solution sequences.
3. The STRESS I/O option controls the output of stress results for the homogenized composite material.
4. Multiple formats are allowed on the same entry, these should be comma separated. If no format is specified, then this output control applies to all formats defined by OUTPUT or FORMAT commands, for which the result is available. See Results Output for information on which results are available in which formats.
5. Multiple instances of this card are allowed; if instances are conflicting, the last instance dominates.
6. The SOUT field on the PCOMP or PCOMPG bulk data entry must be set to YES to activate stress results calculation for the corresponding ply. For Failure Indices to be calculated, the FT and SB fields on PCOMP or PCOMPG bulk data and stress (or strain) allowables on the referenced materials need to be defined.
7. For plies defined on a PCOMPG bulk data entry, the results are grouped by GPLYID. 8. For optimization, the frequency of output to a given format is controlled by the I/O
option OUTPUT. In previous versions of OptiStruct, a combination of the I/O options FORMAT and RESULTS were used; this method is still supported, but not recommended as it does not allow different frequencies for different formats.
9. Failure Index results are not available in the .pch and .op2 files.
DAMAGE
I/O Options and Subcase Information Entry DAMAGE – Output Request
Description
The DAMAGE command can be used in the I/O Options or Subcase Information sections to request fatigue damage results output for all fatigue subcases or individual fatigue subcases respectively.
Format
DAMAGE (format, type) = option
Argument Options Description
format <H3D, OPTI, blank>
Default = blank
H3D: Results are output in Hyper3D format (.h3d file).
OPTI: Results are output in OptiStruct results format (.fat file).
blank: Results are output in all active formats for which the result is available.
type <SUB, LOAD,
EVENT, ALL> Default = SUB
SUB: Only the total damage from the fatigue subcase is output.
LOAD: Damage contribution from each static subcase and total damage from the fatigue subcases are output.
EVENT: Damage contribution from each FATEVNT and total damage from fatigue subcases are output.
ALL: Damage contribution from each FATEVNT,
damage contribution from each static subcase and total damage from fatigue subcases are all output.
Argument Options Description
option <YES, ALL, NO, NONE, SID> Default = ALL
YES, ALL, blank:
Results are output for all elements.
NO, NONE: Results are not output.
SID: If a set ID is specified, results are output only for elements listed in that set. Comments
1. Multiple formats are allowed on the same entry; these should be comma separated. If no format is specified, then this output control applies to all formats defined by OUTPUT or FORMAT commands for which the result is available. See Results Output by OptiStruct for