STRESS / ELSTRESS



Your Ad Here

I/O Options and Subcase Information Entry

STRESS - Output Request

Description

The STRESS command can be used in the I/O Options or Subcase Information sections to request stress output for all subcases or individual subcases respectively.

Format

STRESS (sorting,format,form,type,location) = option

Argument

Options

Description

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.

 

SORT1:

Results for each frequency/timestep are grouped together.

 

SORT2:

Results for each grid/element are grouped together.

 

blank:

SORT1 is used for all results except for transient analysis, whereSORT2 is used.  

 

format

<HM, H3D, OPTI,
PUNCH, OUTPUT2, PATRAN, APATRAN, blank>

HM:

Results are output in HyperMesh results format (.res file).

Default = blank

 

H3D:

Results are output in Hyper3D format (.h3d file).
 

OPTI:

Results are output in OptiStruct results format (multiple files).  
 

PUNCH:

Results are output in Nastran punch results format (.pch file).
 

OUTPUT2:

Results are output in Nastran output2 format (.op2 file).
 

PATRAN:

Results are output in Patran format (multiple files).
 

APATRAN:

Results are output in Patran format (multiple files).
 

blank:

Results are output in all active formats for which the result is available.

 

form

<COMPLEX, REAL, IMAG,
PHASE, BOTH>

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).

 

 

REAL or IMAG:

Provides rectangular format (real and imaginary) of complex output.

 

 

PHASE:

Provides polar format (phase and magnitude) of complex output.

 

 

BOTH:

Provides both rectangular and polar formats of complex output.

 

type

<VON, PRINC, MAXS, SHEAR,
ALL, TENSOR, DIRECT>

VON:

Only von Mises stress results are output.

Default = ALL

PRINC, MAXS, SHEAR:

Von Mises and major principal stress results are output.
 

ALL:

All stress results are output.
 

TENSOR:

All stress results are output.  Tensor format is used for H3D output.
 

DIRECT:

All stress results are output.  Direct format is used for H3D output.

 

location

<CENTER, CUBIC, SGAGE,
CORNER, BILIN>

CENTER:

Element stresses for CQUAD4 elements are output at the element center only.

Default = CENTER

CUBIC:

Element stresses for CQUAD4 elements are output at the element center and grid points using bilinear extrapolation.  
 

SGAGE:

Element stresses for CQUAD4 elements are output at the element center and grid points using bilinear extrapolation.  
 

CORNER or BILIN:

Element stresses for CQUAD4 elements are output at the element center and grid points using bilinear extrapolation.  

 

option

<YES, ALL, NO,
NONE, SID, PSID>

YES, ALL, blank:

Stress results are output for all elements.

Default = ALL

NO, NONE:

Stress results are not output.
 

SID:

If a set ID is given, stress results are output only for elements listed in that set.
 

PSID:

If a property set ID is given, stress results for the elements referencing properties listed in the property set are output.

Comments

  1. When a STRESS command is not present, stress results are output for all elements for all linear static analysis, nonlinear quasi-static gap analysis, and inertia relief analysis subcases.

  2. Altair HyperView can internally derive STRESS results from the stress tensor when the options TENSOR or ALL are used. If the option DIRECT is used, it will display the stress result that were directly computed by OptiStruct.

  3. For elements that reference PCOMP or PCOMPG properties, the STRESS I/O option controls only stress results for the homogenized composite. The CSTRESS I/O option must be used to obtain ply stress and failure index results.

  4. Von Mises and Principal stresses are not available for frequency response analyses.

  5. The form argument is only applicable for frequency response analysis. It is ignored in other instances.

  6. 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.

  7. The location argument is only applicable for CQUAD4 elements.

  8. Only formats that have been activated by an OUTPUT or FORMAT statement are valid for use on this card.

  9. 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.

10.        Multiple instances of this card are allowed; if instances are conflicting, the last instance dominates.

11.        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

I/O Options Section

Alphabetical List of I/O Options

The Input File

Return to Altair HyperWorks Index