CSTRESS
I/O Options and Subcase Information Entry Used in the I/O Options or Subcase Information sections to request ply stress output for shell elements referencing PCOMP, PCOMPP or PCOMPG properties for all subcases or individual subcases, respectively.
It is also supported for solid elements referencing PCOMPLS or PSOLID with MAT9 for linear static, nonlinear static (both small and large displacement) and nonlinear transient (both small and large displacement) analysis for H3D format.
Format
CSTRESS (format_list,type,random,NDIV,statistics, location, SUBSYS, NLOUT) = option
Definitions
Argument | Options | Description |
---|---|---|
format | <HM, H3D, OPTI, PUNCH, OP2, HDF5, blank> |
|
type | <ALL, PRINC, TENSOR,
DIRECT> Default = ALL (in DIRECT format) |
|
random | <PSDF,
RMS, PSDFC> No default |
|
ndiv | <INTEGER> Default = 3 |
Number of divisions where composite stresses are calculated. The maximum number of ndiv allowed in the calculation is 5. 9 - 13 |
statistics | <STATIS, OSTATIS, or blank> | Composite Stress Statistics over time in a Transient Analysis are
controlled by this option. 15
|
location | <CENTER, CORNER, blank> |
See Comment 16. |
SUBSYS | <SUBSYS_ID> No default |
ID of the subsystem. When used along a subsystem definition, this option generates an individual result file for each subsystem with results for that subsystem only. For more information, refer to the SET Bulk Data Entry. |
NLOUT | <NLOUT
ID> No default |
ID of the NLOUT Bulk Data Entry. For more information, refer to Comment 3 in the NLOUT Bulk Data Entry. |
option | <YES,
ALL, blank, NO,
NONE, SID,
PSID> Default = YES |
|
Comments
- When the CSTRESS command is not present, ply stress results are not output.
- The STRESS I/O option controls the output of stress results for the homogenized composite material.
- Multiple formats are allowed on the same entry; these should be comma separated. If a format is not specified, this output control applies to all formats defined by the OUTPUT command, for which the result is available.
- Multiple instances of this card are allowed. If instances are conflicting, the last instance dominates.
- 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 PCOMPP, the SOUT field on the corresponding PLY entries should be set to YES.
- For plies defined on a PCOMPG Bulk Data Entry, the results are grouped by GPLYID.
- For optimization, the frequency of output to a given format is controlled by the I/O option OUTPUT.
- format=OUTPUT2 can also be used to request results to be output in the Nastran output2 format (.op2 file).
- For shell elements, the following shows
the planes where Composite Stresses are calculated for different
ndiv values. BOT, MID
and TOP represents the bottom, middle and top planes of an
individual ply. Division numbers represents the relative distance of a
plane/division from the bottom of a ply.
- NDIV
- Planes, where composite strains are calculated
- 1
- MID
- 2
- BOT, TOP
- 3
- BOT, MID, TOP
- 4
- BOT, 0.33, 0.67, TOP
- 5
- BOT, 0.25, MID, 0.75, TOP
- If different ndiv values are specified in CSTRESS, CSTRAIN, and CFAILURE, the largest value is used in the composite stress, strain and failure indices calculations.
- When CFAILURE is not present, composite strength ratios are not output. CSTRESS and CSTRAIN entries cannot be used to request failure indices.
- For shell elements, the NDIV field is supported for linear static, nonlinear static (small and large displacement), normal modes, direct frequency response, modal frequency response, direct transient, modal transient and nonlinear transient (small and large displacement) analysis types only. The NDIV field is supported for first and second order elements.
- For solid elements, NDIV is always equal to 3, regardless of the user input.
- The HDF5 output is printed to a .h5 binary results file. For details of the supported analysis types and elements when the .h5 output format is requested, refer to the .h5 file.
- Composite Stress Statistics are
supported for Direct and Modal Linear Transient Analysis types.
Only H3D output is supported for Composite Stress Statistics.
The following statistics over time are output for Transient Analysis when STATIS or OSTATIS is specified.- Statistics
- Supported Composite Stress Result Types
- Minimum and Time of Minimum
- P1 (Major), P2 (Mid), P3 (Minor), Normal Stresses in Material (Ply) coordinate system
- Maximum and Time of Maximum
- von Mises, P1 (Major), P2 (Mid), P3 (Minor), Normal Stresses in Material (Ply) coordinate system
- Absolute Maximum and Time of Absolute Maximum
- P1 (Major), P2 (Mid), P3 (Minor), Normal Stresses in Material (Ply) coordinate system
- Arithmetic Mean
- Normal Stresses in Material (Ply) coordinate system
- Root Mean Square (RMS)
- Normal Stresses in Material (Ply) coordinate system
- Variance
- Normal Stresses in Material (Ply) coordinate system
- Standard Deviation
- Normal Stresses in Material (Ply) coordinate system
The Composite Stress Statistics in HyperView can be viewed, after loading the H3D file.
- Corner results are available for linear static and nonlinear static (small and large displacement) analysis types only. Currently, only H3D output is supported.