STRAIN - Output Request
The STRAIN command can be used in the I/O Options or Subcase Information sections to request strain output for all subcases or individual subcases respectively.
STRAIN (sorting,format,form,type) = option
Argument |
Options |
Descriptions |
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sorting |
<SORT1, SORT2> Default = blank |
This argument only applies for PUNCH format (.pch file) output for frequency response and transient subcases. It will be ignored without warning if used elsewhere. |
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SORT1: |
Results for each frequency/timestep are grouped together. |
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SORT2:
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Results for each grid/element are grouped together. | |
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blank: |
SORT1 is used for all results except for transient analysis, whereSORT2 is used. |
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format |
<HM, H3D,
OPTI, |
HM: |
Results are output in HyperMesh results format (.res file). |
| Default = blank |
H3D: |
Results are output in Hyper3D format (.h3d file). |
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OPTI: |
Results are output in OptiStruct results format (.strn file). |
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PUNCH: |
Results are output in Nastran punch results format (.pch file). |
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OUTPUT2: |
Results are output in Nastran output2 format (.op2 file). |
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blank: |
Results are output in all active formats for which the result is available. |
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form |
<COMPLEX, REAL, IMAG, Default = COMPLEX |
COMPLEX: |
Provides a combined magnitude/phase form of complex output to the .res file if HM output format is chosen. The REAL form of complex output is used for other formats if they are not specifically defined. (Phase output is in degrees). |
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REAL or IMAG: |
Provides rectangular format (real and imaginary) of complex output. |
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PHASE: |
Provides polar format (phase and magnitude) of complex output. |
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BOTH: |
Provides both rectangular and polar formats of complex output. |
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type |
<VON, PRINC,
MAXS, SHEAR,
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VON: |
Only von Mises strain results are output. |
| Default = ALL |
PRINC, MAXS, SHEAR: |
Von Mises and major principal strain results are output. |
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ALL:
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All strain results are output. |
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TENSOR: |
All strain results are output. Tensor format is used for H3D output. |
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DIRECT:
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All strain results are output. Direct format is used for H3D output. |
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option |
<YES, ALL,
NO, |
YES, ALL, blank: |
Results are output for all elements. |
| Default = ALL |
NO, NONE: |
Results are not output. |
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SID: |
If a set ID is given, results are output only for elements listed in that set. |
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PSID: |
If a property set ID is given, results for the elements referencing properties listed in the property set are output. |
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When the STRAIN command is not present, no strain data is output.
Altair HyperView can internally derive strain results from the strain tensor when the options TENSOR or ALL are used. If the option DIRECT is used, it will display the strain results that were directly computed by OptiStruct.
Von Mises and Principal stresses are not available for frequency response analysis.
For elements that reference PCOMP and PCOMPG properties, the STRAIN I/O option controls only strain results for the homogenized composite. The CSTRAIN I/O option must be used to obtain ply strain results.
The form argument is only applicable for frequency response analysis. It is ignored in other instances.
The form BOTH does not apply to the .frf output files. Results are output to these files using the rectangular form of complex output when BOTH is the chosen form.
Only formats that have been defined by an OUTPUT or FORMAT statement are valid for use on this card.
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 information on which results are available in which formats.
Multiple instances of this card are allowed; if instances are conflicting, the last instance dominates.
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.
Go To
Alphabetical List of I/O Options