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Stress |
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The Nastran Punch (PCH) format file contains various supported output across multiple solution sequences. The output request initiation and corresponding parameters are controlled by the STRESS I/O Options and Subcase Information Entry.
The Stress output format and information in the PCH file vary based on:
| 1. | Solution Sequence |
| 2. | Requested corresponding output parameters |
This document contains details about PCH output for various solution sequences, with corresponding output parameters (wherever applicable). Example: PCH output from actual models is illustrated with information about the various sections of the output.
Similar PCH format documents are available for all supported output variables (STRAIN, ESE, and so on). See the .pch file for a full list of supported output variables in conjunction with PCH output format, along with a link to each detailed PCH format documents. For additional information about Output available in OptiStruct, refer to the Output section.
The information in the PCH file varies depending on the requested output, however, some parts of the PCH file are common and the syntax is similar to most output data. The PCH file consists of data blocks, each containing corresponding information for the listed Subcase or the subsequent subset data (for example, eigenvalue or time step).
Each data block is printed with the following format.
Line 1 - $TITLE = This represents the Solver Name (OptiStruct) and the version Number (for example, 14.0.220).
Line 2 - $SUBTITLE =
Line 3 – $LABEL = This is the label of the Current Subcase (this is input in the model)
Line 4 - $<result type> This represents the type of results being printed in this data block.
Line 5 - $SUBCASE ID = This represents the ID of the subcase for which the results are printed in this data block. The $LABEL field in line 3 corresponds to this subcase.
Line 6 (Optional) - $<sorting> This is only printed if results of type <result type> can be further segregated based on additional filters (for example, additional filter: eigenvalue for result type: eigenvector or additional filter: ELEMENT TYPE for result type: STRESS).
The supported Stress output parameters for Linear Static Analysis are:
For Stress results the output is presented in the following format. Note that the format for elemental results such as stress is dependent on the element type. Therefore, the following sections illustrate the format and stress entities for each element type.
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
CBEAM Grid ID |
2 |
Station/Location Distance along the beam where stress is output |
3 |
Longitudinal Stress at Point C |
4 |
Longitudinal Stress at Point D |
5 |
Longitudinal Stress at Point E |
6 |
Longitudinal Stress at Point F |
7 |
Maximum Stress |
8 |
Minimum Stress |
9 |
Safety Margin in Tension |
10 |
Safety Margin in Compression |
11 |
The above result block is repeated for all intermediate stations and the other end of the beam. Currently intermediate stations are not supported and are output as 0.0. |
Stress Results are output at ends A and B at stress recovery points C, D, E, and F. For PBEAM, the stress recovery points are user-defined on the PBEAM bulk data entry. For PBEAML, the stress recovery points are automatically defined by the beam type and dimensions. Stress recovery at intermediate stations along the CBEAM element is currently not supported.
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
CBAR Element ID |
2 |
Bending Stress at Point C of End A |
3 |
Bending Stress at Point D of End A |
4 |
Bending Stress at Point E of End A |
5 |
Bending Stress at Point F of End A |
6 |
Axial Stress |
7 |
Maximum Stress at End A |
8 |
Minimum Stress at End A |
9 |
Safety Margin in Tension |
10 |
Bending Stress at Point C of End B |
11 |
Bending Stress at Point D of End B |
12 |
Bending Stress at Point E of End B |
13 |
Bending Stress at Point F of End B |
14 |
Maximum Stress at End B |
15 |
Minimum Stress at End B |
16 |
Safety Margin in Compression |
Stress Results are output at ends A and B at stress recovery points C, D, E, and F. For PBAR, the stress recovery points are user-defined on the PBAR bulk data entry. For PBARL, the stress recovery points are automatically defined by the beam type and dimensions.
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
CELAS Element ID |
2 |
Stress along component listed on CELAS entry |
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
CROD Element ID |
2 |
Axial Stress |
3 |
Axial Stress Safety Margin |
4 |
Torsional Stress |
5 |
Torsional Stress Safety Margin |
CTUBE element results are listed as CROD results in the .pch file.
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
CWELD Element ID |
2 |
Axial Stress |
3 |
Maximum Stress at End A |
4 |
Minimum Stress at End A |
5 |
Maximum Stress at End B |
6 |
Minimum Stress at End B |
7 |
Maximum Shear Stress |
8 |
Bearing Stress |
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
CBUSH Element ID |
2 |
Stress Translational X |
3 |
Stress Translational Y |
4 |
Stress Translational Z |
5 |
Stress Moment X |
6 |
Stress Moment Y |
7 |
Stress Moment Z |
Element Stress results are not output for CFAST elements in the .pch file.
The type of stress information printed for 2D elements (CQUAD4, CQUAD8, CTRIA3, and CTRIA6) is common. However, the results format and information depends on the results location requested on the STRESS entry.
This is the default option for the location argument. The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
2D Element ID |
2 |
Fiber Distance (at location Z1 defined on PSHELL) |
3 |
Normal XX Stress (at location Z1 defined on PSHELL) |
4 |
Normal YY Stress (at location Z1 defined on PSHELL) |
5 |
Shear XY Stress (at location Z1 defined on PSHELL) |
6 |
Principal Stress Angle (at location Z1 defined on PSHELL) |
7 |
Major Principal Stress (at location Z1 defined on PSHELL) |
8 |
Minor Principal Stress (at location Z1 defined on PSHELL) |
9 |
von Mises Stress (at location Z1 defined on PSHELL) |
10 |
Fiber Distance (at location Z2 defined on PSHELL) |
11 |
Normal XX Stress (at location Z2 defined on PSHELL) |
12 |
Normal YY Stress (at location Z2 defined on PSHELL) |
13 |
Shear XY Stress (at location Z2 defined on PSHELL) |
14 |
Principal Stress Angle (at location Z2 defined on PSHELL) |
15 |
Major Principal Stress (at location Z2 defined on PSHELL) |
16 |
Minor Principal Stress (at location Z2 defined on PSHELL) |
17 |
von Mises Stress (at location Z2 defined on PSHELL) |
Stress results are output at element center and grid points. The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
2D Element ID |
2 |
CEN/ flag identifying that the current result block displays element center results. |
3 |
An Integer listing the number of grid points of the element at which results are output in the subsequent block after the central results. |
4 |
Fiber Distance (at location Z1 defined on PSHELL) |
5 |
Normal XX Stress (at location Z1 defined on PSHELL) |
6 |
Normal YY Stress (at location Z1 defined on PSHELL) |
7 |
Shear XY Stress (at location Z1 defined on PSHELL) |
8 |
Principal Stress Angle (at location Z1 defined on PSHELL) |
9 |
Major Principal Stress (at location Z1 defined on PSHELL) |
10 |
Minor Principal Stress (at location Z1 defined on PSHELL) |
11 |
von Mises Stress (at location Z1 defined on PSHELL) |
12 |
Fiber Distance (at location Z2 defined on PSHELL) |
13 |
Normal XX Stress (at location Z2 defined on PSHELL) |
14 |
Normal YY Stress (at location Z2 defined on PSHELL) |
15 |
Shear XY Stress (at location Z2 defined on PSHELL) |
16 |
Principal Stress Angle (at location Z2 defined on PSHELL) |
17 |
Major Principal Stress (at location Z2 defined on PSHELL) |
18 |
Minor Principal Stress (at location Z2 defined on PSHELL) |
19 |
von Mises Stress (at location Z2 defined on PSHELL) |
20 |
Grid Point ID at which stress results are output in the subsequent block. |
21 |
Fiber Distance (at location Z1 defined on PSHELL) |
22 |
Normal XX Stress (at location Z1 defined on PSHELL) |
23 |
Normal YY Stress (at location Z1 defined on PSHELL) |
24 |
Shear XY Stress (at location Z1 defined on PSHELL) |
25 |
Principal Stress Angle (at location Z1 defined on PSHELL) |
26 |
Major Principal Stress (at location Z1 defined on PSHELL) |
27 |
Minor Principal Stress (at location Z1 defined on PSHELL) |
28 |
von Mises Stress (at location Z1 defined on PSHELL) |
29 |
Fiber Distance (at location Z2 defined on PSHELL) |
30 |
Normal XX Stress (at location Z2 defined on PSHELL) |
31 |
Normal YY Stress (at location Z2 defined on PSHELL) |
32 |
Shear XY Stress (at location Z2 defined on PSHELL) |
33 |
Principal Stress Angle (at location Z2 defined on PSHELL) |
34 |
Major Principal Stress (at location Z2 defined on PSHELL) |
35 |
Minor Principal Stress (at location Z2 defined on PSHELL) |
36 |
von Mises Stress (at location Z2 defined on PSHELL) |
37 |
Items 20 to 36 are repeated in sequence for all grid points of the element ID mentioned in item 1. The number of grid points for each element is mentioned in item 3. |
GAUSS results are currently not supported for PCH output.
The type and formatting of stress information printed for 3D elements (CHEXA, CTETRA, and CPENTA) is common. The order of information printed in the .pch file is:
This is the default option for the location argument. The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
3D Element ID |
2 |
Placeholder negative integer (-1). |
3 |
GRID flag |
4 |
Number of Grids at which results are output for the element mentioned in item 1 (set to 0 if only element center results are requested). |
5 |
CENTER flag indicating that element center results are output in the following block. |
6 |
Normal XX Stress |
7 |
Shear XY Stress |
8 |
Major Principal Stress |
9 |
Major Principal X Cosine |
10 |
Mid Principal X Cosine |
11 |
Minor Principal X Cosine |
12 |
Mean Stress |
13 |
von Mises Stress |
14 |
Normal YY Stress |
15 |
Shear YZ Stress |
16 |
Mid Principal Stress |
17 |
Major Principal Y Cosine |
18 |
Mid Principal Y Cosine |
19 |
Minor Principal Y Cosine |
20 |
Normal ZZ Stress |
21 |
Shear XZ Stress |
22 |
Minor Principal Stress |
23 |
Major Principal Z Cosine |
24 |
Mid Principal Z Cosine |
25 |
Minor Principal Z Cosine |
Stress results are output at element center and grid points. The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
3D Element ID |
2 |
Placeholder negative integer (-1). |
3 |
GRID flag |
4 |
Number of Grids at which results are output for the element mentioned in item 1 (set to 0 if only element center results are requested). |
5 |
CENTER flag indicating that element center results are output in the following block. |
6 |
Normal XX Stress |
7 |
Shear XY Stress |
8 |
Major Principal Stress |
9 |
Major Principal X Cosine |
10 |
Mid Principal X Cosine |
11 |
Minor Principal X Cosine |
12 |
Mean Stress |
13 |
von Mises Stress |
14 |
Normal YY Stress |
15 |
Shear YZ Stress |
16 |
Mid Principal Stress |
17 |
Major Principal Y Cosine |
18 |
Mid Principal Y Cosine |
19 |
Minor Principal Y Cosine |
20 |
Normal ZZ Stress |
21 |
Shear XZ Stress |
22 |
Minor Principal Stress |
23 |
Major Principal Z Cosine |
24 |
Mid Principal Z Cosine |
25 |
Minor Principal Z Cosine |
26 |
Grid ID indicating that stress results in the subsequent block are output at the specified Grid. |
27 |
Normal XX Stress |
28 |
Shear XY Stress |
29 |
Major Principal Stress |
30 |
Major Principal X Cosine |
31 |
Mid Principal X Cosine |
32 |
Minor Principal X Cosine |
33 |
Mean Stress |
34 |
von Mises Stress |
35 |
Normal YY Stress |
36 |
Shear YZ Stress |
37 |
Mid Principal Stress |
38 |
Major Principal Y Cosine |
39 |
Mid Principal Y Cosine |
40 |
Minor Principal Y Cosine |
41 |
Normal ZZ Stress |
42 |
Shear XZ Stress |
43 |
Minor Principal Stress |
44 |
Major Principal Z Cosine |
45 |
Mid Principal Z Cosine |
46 |
Minor Principal Z Cosine |
47 |
Items 26 to 46 are repeated in sequence for all grid points of the element ID mentioned in item 1. The number of grid points for each element is mentioned in item 3. |
GAUSS results are currently not supported for PCH output.
The supported Stress output parameters for Frequency Response Analysis are:
For Stress results output is presented in the following format. Note that the format for elemental results such as stress is dependent on the element type. Therefore, the following sections illustrate the format and stress entities for each element type.
Frequency response stress results may be output in Real/Imaginary or Magnitude/Phase formats via the REAL/IMAG or PHASE arguments, respectively on the STRESS entry.
Frequency response stress results may be output in either SORT1 or SORT2 formats. The following information is presented in SORT1 format (which is the default for Frequency Response analysis).
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
CBEAM Element ID |
2 |
CBEAM Grid ID |
3 |
Station/Location Distance along the beam where stress is output |
4 |
Real Part (or Magnitude) of Longitudinal Stress at Point C |
5 |
Real Part (or Magnitude) of Longitudinal Stress at Point D |
6 |
Real Part (or Magnitude) of Longitudinal Stress at Point E |
7 |
Real Part (or Magnitude) of Longitudinal Stress at Point F |
8 |
Imaginary Part (or Phase) of Longitudinal Stress at Point C |
9 |
Imaginary Part (or Phase) of Longitudinal Stress at Point D |
10 |
Imaginary Part (or Phase) of Longitudinal Stress at Point E |
11 |
Imaginary Part (or Phase) of Longitudinal Stress at Point F |
12 |
The above result block from entry 2 to 11 is repeated for all intermediate stations and the other end of the beam. Currently intermediate stations are not supported and are output as 0.0. |
Stress Results are output at ends A and B at stress recovery points C, D, E, and F. For PBEAM, the stress recovery points are user-defined on the PBEAM bulk data entry. For PBEAML, the stress recovery points are automatically defined by the beam type and dimensions. Stress recovery at intermediate stations along the CBEAM element is currently not supported.
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
CBAR Element ID |
2 |
Real Part (or Magnitude) of Bending Stress at Point C of End A |
3 |
Real Part (or Magnitude) of Bending Stress at Point D of End A |
4 |
Real Part (or Magnitude) of Bending Stress at Point E of End A |
5 |
Real Part (or Magnitude) of Bending Stress at Point F of End A |
6 |
Real Part (or Magnitude) of Axial Stress |
7 |
Imaginary Part (or Phase) of Bending Stress at Point C of End A |
8 |
Imaginary Part (or Phase) of Bending Stress at Point D of End A |
9 |
Imaginary Part (or Phase) of Bending Stress at Point E of End A |
10 |
Imaginary Part (or Phase) of Bending Stress at Point F of End A |
11 |
Imaginary Part (or Phase) of Axial Stress |
12 |
Real Part (or Magnitude) of Bending Stress at Point C of End B |
13 |
Real Part (or Magnitude) of Bending Stress at Point D of End B |
14 |
Real Part (or Magnitude) of Bending Stress at Point E of End B |
15 |
Real Part (or Magnitude) of Bending Stress at Point F of End B |
16 |
Imaginary Part (or Phase) of Bending Stress at Point C of End B |
17 |
Imaginary Part (or Phase) of Bending Stress at Point D of End B |
18 |
Imaginary Part (or Phase) of Bending Stress at Point E of End B |
19 |
Imaginary Part (or Phase) of Bending Stress at Point F of End B |
Stress Results are output at ends A and B at stress recovery points C, D, E, and F. For PBAR, the stress recovery points are user-defined on the PBAR bulk data entry. For PBARL, the stress recovery points are automatically defined by the beam type and dimensions.
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
CELAS Element ID |
2 |
Real Part (or Magnitude) of Stress along component listed on CELAS entry |
3 |
Imaginary Part (or Phase) of Stress along component listed on CELAS entry |
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
CROD Element ID |
2 |
Real Part (or Magnitude) of Axial Stress |
3 |
Imaginary Part (or Phase) of Axial Stress |
4 |
Real Part (or Magnitude) of Torsional Stress |
5 |
Imaginary Part (or Phase) of Torsional Stress |
CTUBE element results are listed as CROD results in the .pch file.
CWELD results are not supported in Frequency Response Analysis in the PCH file.
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
CBUSH Element ID |
2 |
Real Part (or Magnitude) of Stress Translational X |
3 |
Real Part (or Magnitude) of Stress Translational Y |
4 |
Real Part (or Magnitude) of Stress Translational Z |
5 |
Real Part (or Magnitude) of Stress Moment X |
6 |
Real Part (or Magnitude) of Stress Moment Y |
7 |
Real Part (or Magnitude) of Stress Moment Z |
2 |
Imaginary Part (or Phase) of Stress Translational X |
3 |
Imaginary Part (or Phase) of Stress Translational Y |
4 |
Imaginary Part (or Phase) of Stress Translational Z |
5 |
Imaginary Part (or Phase) of Stress Moment X |
6 |
Imaginary Part (or Phase) of Stress Moment Y |
7 |
Imaginary Part (or Phase) of Stress Moment Z |
Element Stress results are not output for CFAST elements in the .pch file.
The type of stress information printed for 2D elements (CQUAD4, CQUAD8, CTRIA3, and CTRIA6) is common. However, the results format and information depends on the results location requested on the STRESS entry. Frequency response stress results may be output in Real/Imaginary or Magnitude/Phase formats via the REAL/IMAG or PHASE arguments, respectively on the STRESS entry.
This is the default option for the location argument. The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
2D Element ID |
2 |
Fiber Distance (at location Z1 defined on PSHELL) |
3 |
Real Part (or Magnitude) of Normal XX Stress (at location Z1 defined on PSHELL) |
4 |
Imaginary Part (or Phase) of Normal XX Stress (at location Z1 defined on PSHELL) |
5 |
Real Part (or Magnitude) of Normal YY Stress (at location Z1 defined on PSHELL) |
6 |
Imaginary Part (or Phase) of Normal YY Stress (at location Z1 defined on PSHELL) |
7 |
Real Part (or Magnitude) of Shear XY Stress (at location Z1 defined on PSHELL) |
8 |
Imaginary Part (or Phase) of Shear XY Stress (at location Z1 defined on PSHELL) |
9 |
Fiber Distance (at location Z2 defined on PSHELL) |
10 |
Real Part (or Magnitude) of Normal XX Stress (at location Z2 defined on PSHELL) |
11 |
Imaginary Part (or Phase) of Normal XX Stress (at location Z2 defined on PSHELL) |
12 |
Real Part (or Magnitude) of Normal YY Stress (at location Z2 defined on PSHELL) |
13 |
Imaginary Part (or Phase) of Normal YY Stress (at location Z2 defined on PSHELL) |
14 |
Real Part (or Magnitude) of Shear XY Stress (at location Z2 defined on PSHELL) |
15 |
Imaginary Part (or Phase) of Shear XY Stress (at location Z2 defined on PSHELL) |
Stress results are output at element center and grid points. The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
2D Element ID |
2 |
CEN/ flag identifying that the current result block displays element center results. |
3 |
An Integer listing the number of grid points of the element at which results are output in the subsequent block after the central results. |
4 |
Fiber Distance (at location Z1 defined on PSHELL) |
5 |
Real Part (or Magnitude) of Normal XX Stress (at location Z1 defined on PSHELL) |
6 |
Imaginary Part (or Phase) of Normal XX Stress (at location Z1 defined on PSHELL) |
7 |
Real Part (or Magnitude) of Normal YY Stress (at location Z1 defined on PSHELL) |
8 |
Imaginary Part (or Phase) of Normal YY Stress (at location Z1 defined on PSHELL) |
9 |
Real Part (or Magnitude) of Shear XY Stress (at location Z1 defined on PSHELL) |
10 |
Imaginary Part (or Phase) of Shear XY Stress (at location Z1 defined on PSHELL) |
11 |
Fiber Distance (at location Z2 defined on PSHELL) |
12 |
Real Part (or Magnitude) of Normal XX Stress (at location Z2 defined on PSHELL) |
13 |
Imaginary Part (or Phase) of Normal XX Stress (at location Z2 defined on PSHELL) |
14 |
Real Part (or Magnitude) of Normal YY Stress (at location Z2 defined on PSHELL) |
15 |
Imaginary Part (or Phase) of Normal YY Stress (at location Z2 defined on PSHELL) |
16 |
Real Part (or Magnitude) of Shear XY Stress (at location Z2 defined on PSHELL) |
17 |
Imaginary Part (or Phase) of Shear XY Stress (at location Z2 defined on PSHELL) |
18 |
Grid Point ID at which stress results are output in the subsequent block. |
19 |
Fiber Distance (at location Z1 defined on PSHELL) |
20 |
Real Part (or Magnitude) of Normal XX Stress (at location Z1 defined on PSHELL) |
21 |
Imaginary Part (or Phase) of Normal XX Stress (at location Z1 defined on PSHELL) |
22 |
Real Part (or Magnitude) of Normal YY Stress (at location Z1 defined on PSHELL) |
23 |
Imaginary Part (or Phase) of Normal YY Stress (at location Z1 defined on PSHELL) |
24 |
Real Part (or Magnitude) of Shear XY Stress (at location Z1 defined on PSHELL) |
25 |
Imaginary Part (or Phase) of Shear XY Stress (at location Z1 defined on PSHELL) |
26 |
Fiber Distance (at location Z2 defined on PSHELL) |
27 |
Real Part (or Magnitude) of Normal XX Stress (at location Z2 defined on PSHELL) |
28 |
Imaginary Part (or Phase) of Normal XX Stress (at location Z2 defined on PSHELL) |
29 |
Real Part (or Magnitude) of Normal YY Stress (at location Z2 defined on PSHELL) |
30 |
Imaginary Part (or Phase) of Normal YY Stress (at location Z2 defined on PSHELL) |
31 |
Real Part (or Magnitude) of Shear XY Stress (at location Z2 defined on PSHELL) |
32 |
Imaginary Part (or Phase) of Shear XY Stress (at location Z2 defined on PSHELL) |
33 |
Items 18 to 32 are repeated in sequence for all grid points of the element ID mentioned in item 1. The number of grid points for each element is mentioned in item 3. |
GAUSS results are currently not supported for PCH output.
The type and formatting of stress information printed for 3D elements (CHEXA, CTETRA, and CPENTA) is common. The order of information printed in the .pch file is:
This is the default option for the location argument. The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
3D Element ID |
2 |
Placeholder negative integer (-1). |
3 |
GRID flag |
4 |
Number of Grids at which results are output for the element mentioned in item 1 (set to 0 if only element center results are requested). |
5 |
CENTER flag indicating that element center results are output in the following block. |
6 |
Real Part (or Magnitude) of Normal XX Stress |
7 |
Real Part (or Magnitude) of Normal YY Stress |
8 |
Real Part (or Magnitude) of Normal ZZ Stress |
9 |
Real Part (or Magnitude) of Shear XY Stress |
10 |
Real Part (or Magnitude) of Shear YZ Stress |
11 |
Real Part (or Magnitude) of Shear ZX Stress |
12 |
Imaginary Part (or Phase) of Normal XX Stress |
13 |
Imaginary Part (or Phase) of Normal YY Stress |
14 |
Imaginary Part (or Phase) of Normal ZZ Stress |
15 |
Imaginary Part (or Phase) of Shear XY Stress |
16 |
Imaginary Part (or Phase) of Shear YZ Stress |
17 |
Imaginary Part (or Phase) of Shear ZX Stress |
Stress results are output at element center and grid points. The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
3D Element ID |
2 |
Placeholder negative integer (-1). |
3 |
GRID flag |
4 |
Number of Grids at which results are output for the element mentioned in item 1 (set to 0 if only element center results are requested). |
5 |
CENTER flag indicating that element center results are output in the following block. |
6 |
Real Part (or Magnitude) of Normal XX Stress |
7 |
Real Part (or Magnitude) of Normal YY Stress |
8 |
Real Part (or Magnitude) of Normal ZZ Stress |
9 |
Real Part (or Magnitude) of Shear XY Stress |
10 |
Real Part (or Magnitude) of Shear YZ Stress |
11 |
Real Part (or Magnitude) of Shear ZX Stress |
12 |
Imaginary Part (or Phase) of Normal XX Stress |
13 |
Imaginary Part (or Phase) of Normal YY Stress |
14 |
Imaginary Part (or Phase) of Normal ZZ Stress |
15 |
Imaginary Part (or Phase) of Shear XY Stress |
16 |
Imaginary Part (or Phase) of Shear YZ Stress |
17 |
Imaginary Part (or Phase) of Shear ZX Stress |
18 |
Grid ID for which the subsequent result block is output. |
19 |
Real Part (or Magnitude) of Normal XX Stress |
20 |
Real Part (or Magnitude) of Normal YY Stress |
21 |
Real Part (or Magnitude) of Normal ZZ Stress |
22 |
Real Part (or Magnitude) of Shear XY Stress |
23 |
Real Part (or Magnitude) of Shear YZ Stress |
24 |
Real Part (or Magnitude) of Shear ZX Stress |
25 |
Imaginary Part (or Phase) of Normal XX Stress |
26 |
Imaginary Part (or Phase) of Normal YY Stress |
27 |
Imaginary Part (or Phase) of Normal ZZ Stress |
28 |
Imaginary Part (or Phase) of Shear XY Stress |
29 |
Imaginary Part (or Phase) of Shear YZ Stress |
30 |
Imaginary Part (or Phase) of Shear ZX Stress |
31 |
Items 18 to 30 are repeated in sequence for all grid points of the element ID mentioned in item 1. The number of grid points for each element is mentioned in item 3. |
GAUSS results are currently not supported for PCH output.
The supported Stress output parameters for Random Response Analysis are:
For Stress results with the default settings, for example if STRESS(PUNCH)=ALL/SID is used, the output is presented in the following format. For Random Response Analysis, the Stress results are basically Power Spectral Density Stress values for each loading . PSD output (via PSDF argument) and RMS total over all frequencies are output to the PCH file. RMS cumulative up to a particular frequency are not printed to the PCH file. The format for
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
CBEAM Element ID |
2 |
CBEAM Grid ID |
3 |
Station/Location Distance along the beam where stress is output |
4 |
Longitudinal PSDF/RMS-over-Frequencies Stress at Point C |
5 |
Longitudinal PSDF/RMS-over-Frequencies Stress at Point D |
6 |
Longitudinal PSDF/RMS-over-Frequencies Stress at Point E |
7 |
Longitudinal PSDF/RMS-over-Frequencies Stress at Point F |
8 |
The above result block is repeated for all intermediate stations and the other end of the beam. Currently intermediate stations are not supported and are output as 0.0. |
Stress Results are output at ends A and B at stress recovery points C, D, E, and F. For PBEAM, the stress recovery points are user-defined on the PBEAM bulk data entry. For PBEAML, the stress recovery points are automatically defined by the beam type and dimensions. Stress recovery at intermediate stations along the CBEAM element is currently not supported.
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
CBAR Element ID |
2 |
Bending PSDF/RMS-over-Frequencies Stress at Point C of End A |
3 |
Bending PSDF/RMS-over-Frequencies Stress at Point D of End A |
4 |
Bending PSDF/RMS-over-Frequencies Stress at Point E of End A |
5 |
Bending PSDF/RMS-over-Frequencies Stress at Point F of End A |
6 |
Axial Stress |
10 |
Bending PSDF/RMS-over-Frequencies Stress at Point C of End B |
11 |
Bending PSDF/RMS-over-Frequencies Stress at Point D of End B |
12 |
Bending PSDF/RMS-over-Frequencies Stress at Point E of End B |
13 |
Bending PSDF/RMS-over-Frequencies Stress at Point F of End B |
Stress Results are output at ends A and B at stress recovery points C, D, E, and F. For PBAR, the stress recovery points are user-defined on the PBAR bulk data entry. For PBARL, the stress recovery points are automatically defined by the beam type and dimensions.
Element PSDF Stress results are not output for CFAST, CWELD, CBUSH, CROD, and CELAS elements in the .pch file.
The type of stress information printed for 2D elements (CQUAD4, CQUAD8, CTRIA3, and CTRIA6) is common. However, the results format and information depends on the results location requested on the STRESS entry.
This is the default option for the location argument. The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
2D Element ID |
2 |
Fiber Distance (at location Z1 defined on PSHELL) |
3 |
Normal XX PSDF/RMS-over-Frequencies Stress (at location Z1 defined on PSHELL) |
4 |
Normal YY PSDF/RMS-over-Frequencies Stress (at location Z1 defined on PSHELL) |
5 |
Shear XY PSDF/RMS-over-Frequencies Stress (at location Z1 defined on PSHELL) |
6 |
Fiber Distance (at location Z2 defined on PSHELL) |
7 |
Normal XX PSDF/RMS-over-Frequencies Stress (at location Z2 defined on PSHELL) |
8 |
Normal YY PSDF/RMS-over-Frequencies Stress (at location Z2 defined on PSHELL) |
9 |
Shear XY PSDF/RMS-over-Frequencies Stress (at location Z2 defined on PSHELL) |
Stress results are output at element center and grid points. The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
2D Element ID |
2 |
CEN/ flag identifying that the current result block displays element center results. |
3 |
An Integer listing the number of grid points of the element at which results are output in the subsequent block after the central results. |
4 |
Fiber Distance (at location Z1 defined on PSHELL) |
5 |
Normal XX PSDF/RMS-over-Frequencies Stress (at location Z1 defined on PSHELL) |
6 |
Normal YY PSDF/RMS-over-Frequencies Stress (at location Z1 defined on PSHELL) |
7 |
Shear XY PSDF/RMS-over-Frequencies Stress (at location Z1 defined on PSHELL) |
8 |
Fiber Distance (at location Z2 defined on PSHELL) |
9 |
Normal XX PSDF/RMS-over-Frequencies Stress (at location Z2 defined on PSHELL) |
10 |
Normal YY PSDF/RMS-over-Frequencies Stress (at location Z2 defined on PSHELL) |
11 |
Shear XY PSDF/RMS-over-Frequencies Stress (at location Z2 defined on PSHELL) |
12 |
Grid Point ID at which stress results are output in the subsequent block. |
13 |
Fiber Distance (at location Z1 defined on PSHELL) |
14 |
Normal XX PSDF/RMS-over-Frequencies Stress (at location Z1 defined on PSHELL) |
15 |
Normal YY PSDF/RMS-over-Frequencies Stress (at location Z1 defined on PSHELL) |
16 |
Shear XY PSDF/RMS-over-Frequencies Stress (at location Z1 defined on PSHELL) |
17 |
Fiber Distance (at location Z2 defined on PSHELL) |
18 |
Normal XX PSDF/RMS-over-Frequencies Stress (at location Z2 defined on PSHELL) |
19 |
Normal YY PSDF/RMS-over-Frequencies Stress (at location Z2 defined on PSHELL) |
20 |
Shear XY PSDF/RMS-over-Frequencies Stress (at location Z2 defined on PSHELL) |
21 |
Items 12 to 20 are repeated in sequence for all grid points of the element ID mentioned in item 1. The number of grid points for each element is mentioned in item 3. |
GAUSS results are currently not supported for PCH output.
The type and formatting of stress information printed for 3D elements (CHEXA, CTETRA, and CPENTA) is common. The order of information printed in the .pch file is:
This is the default option for the location argument. The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
3D Element ID |
2 |
Placeholder negative integer (-1). |
3 |
GRID flag |
4 |
Number of Grids at which results are output for the element mentioned in item 1 (set to 0 if only element center results are requested) |
5 |
CENTER flag indicating that element center results are output in the following block. |
6 |
Normal XX PSDF/RMS-over-Frequencies Stress |
7 |
Normal YY PSDF/RMS-over-Frequencies Stress |
8 |
Normal ZZ PSDF/RMS-over-Frequencies Stress |
9 |
Shear XY PSDF/RMS-over-Frequencies Stress |
10 |
Shear YZ PSDF/RMS-over-Frequencies Stress |
11 |
Shear ZX PSDF/RMS-over-Frequencies Stress |
Stress results are output at element center and grid points. The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
3D Element ID |
2 |
Placeholder negative integer (-1). |
3 |
GRID flag |
4 |
Number of Grids at which results are output for the element mentioned in item 1 (set to 0 if only element center results are requested) |
5 |
CENTER flag indicating that element center results are output in the following block. |
6 |
Normal XX PSDF/RMS-over-Frequencies Stress |
7 |
Normal YY PSDF/RMS-over-Frequencies Stress |
8 |
Normal ZZ PSDF/RMS-over-Frequencies Stress |
9 |
Shear XY PSDF/RMS-over-Frequencies Stress |
10 |
Shear YZ PSDF/RMS-over-Frequencies Stress |
11 |
Shear ZX PSDF/RMS-over-Frequencies Stress |
12 |
Grid ID indicating that stress results in the subsequent block are output at the specified Grid. |
13 |
Normal XX PSDF/RMS-over-Frequencies Stress |
14 |
Normal YY PSDF/RMS-over-Frequencies Stress |
15 |
Normal ZZ PSDF/RMS-over-Frequencies Stress |
16 |
Shear XY PSDF/RMS-over-Frequencies Stress |
17 |
Shear YZ PSDF/RMS-over-Frequencies Stress |
18 |
Shear ZX PSDF/RMS-over-Frequencies Stress |
19 |
Items 12 to 18 are repeated in sequence for all grid points of the element ID mentioned in item 1. The number of grid points for each element is mentioned in item 3. |
GAUSS results are currently not supported for PCH output.
The supported Stress output parameters for Linear Transient Response Analysis are:
For Stress results output is presented in the following format. Note that the format for elemental results such as stress is dependent on the element type. Therefore, the following sections illustrate the format and stress entities for each element type.
Linear Transient response stress results may be output in either SORT1 or SORT2 formats. The following information is presented in SORT2 format (which is the default for Transient analysis).
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
Time step |
2 |
CBEAM Grid ID |
3 |
Station/Location Distance along the beam where stress is output |
4 |
Longitudinal Stress at Point C |
5 |
Longitudinal Stress at Point D |
6 |
Longitudinal Stress at Point E |
7 |
Longitudinal Stress at Point F |
8 |
Maximum Stress |
9 |
Minimum Stress |
10 |
Safety Margin in Tension |
11 |
Safety Margin in Compression |
12 |
The above result block is repeated for all intermediate stations and the other end of the beam. Currently intermediate stations are not supported and are output as 0.0. |
Stress Results are output at ends A and B at stress recovery points C, D, E, and F. For PBEAM, the stress recovery points are user-defined on the PBEAM bulk data entry. For PBEAML, the stress recovery points are automatically defined by the beam type and dimensions. Stress recovery at intermediate stations along the CBEAM element is currently not supported.
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
Time Step |
2 |
Bending Stress at Point C of End A |
3 |
Bending Stress at Point D of End A |
4 |
Bending Stress at Point E of End A |
5 |
Bending Stress at Point F of End A |
6 |
Axial Stress |
7 |
Maximum Stress at End A |
8 |
Minimum Stress at End A |
9 |
Safety Margin in Tension |
10 |
Bending Stress at Point C of End B |
11 |
Bending Stress at Point D of End B |
12 |
Bending Stress at Point E of End B |
13 |
Bending Stress at Point F of End B |
14 |
Maximum Stress at End B |
15 |
Minimum Stress at End B |
16 |
Safety Margin in Compression |
Stress Results are output at ends A and B at stress recovery points C, D, E, and F. For PBAR, the stress recovery points are user-defined on the PBAR bulk data entry. For PBARL, the stress recovery points are automatically defined by the beam type and dimensions.
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
Time step |
2 |
Stress along component listed on CELAS entry |
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
Time Step |
2 |
Axial Stress |
3 |
Axial Stress Safety Margin |
4 |
Torsional Stress |
5 |
Torsional Stress Safety Margin |
CTUBE element results are listed as CROD results in the .pch file.
The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
Time step |
2 |
Stress Translational X |
3 |
Stress Translational Y |
4 |
Stress Translational Z |
5 |
Stress Moment X |
6 |
Stress Moment Y |
7 |
Stress Moment Z |
Element Stress results are not output for CFAST elements in the .pch file.
The type of stress information printed for 2D elements (CQUAD4, CQUAD8, CTRIA3, and CTRIA6) is common. However, the results format and information depends on the results location requested on the STRESS entry.
This is the default option for the location argument. The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
Time step |
2 |
Fiber Distance (at location Z1 defined on PSHELL) |
3 |
Normal XX Stress (at location Z1 defined on PSHELL) |
4 |
Normal YY Stress (at location Z1 defined on PSHELL) |
5 |
Shear XY Stress (at location Z1 defined on PSHELL) |
6 |
Principal Stress Angle (at location Z1 defined on PSHELL) |
7 |
Major Principal Stress (at location Z1 defined on PSHELL) |
8 |
Minor Principal Stress (at location Z1 defined on PSHELL) |
9 |
von Mises Stress (at location Z1 defined on PSHELL) |
10 |
Fiber Distance (at location Z2 defined on PSHELL) |
11 |
Normal XX Stress (at location Z2 defined on PSHELL) |
12 |
Normal YY Stress (at location Z2 defined on PSHELL) |
13 |
Shear XY Stress (at location Z2 defined on PSHELL) |
14 |
Principal Stress Angle (at location Z2 defined on PSHELL) |
15 |
Major Principal Stress (at location Z2 defined on PSHELL) |
16 |
Minor Principal Stress (at location Z2 defined on PSHELL) |
17 |
von Mises Stress (at location Z2 defined on PSHELL) |
Stress results are output at element center and grid points. The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
Time step |
2 |
CEN/ flag identifying that the current result block displays element center results. |
3 |
An Integer listing the number of grid points of the element at which results are output in the subsequent block after the central results. |
4 |
Fiber Distance (at location Z1 defined on PSHELL) |
5 |
Normal XX Stress (at location Z1 defined on PSHELL) |
6 |
Normal YY Stress (at location Z1 defined on PSHELL) |
7 |
Shear XY Stress (at location Z1 defined on PSHELL) |
8 |
Principal Stress Angle (at location Z1 defined on PSHELL) |
9 |
Major Principal Stress (at location Z1 defined on PSHELL) |
10 |
Minor Principal Stress (at location Z1 defined on PSHELL) |
11 |
von Mises Stress (at location Z1 defined on PSHELL) |
12 |
Fiber Distance (at location Z2 defined on PSHELL) |
13 |
Normal XX Stress (at location Z2 defined on PSHELL) |
14 |
Normal YY Stress (at location Z2 defined on PSHELL) |
15 |
Shear XY Stress (at location Z2 defined on PSHELL) |
16 |
Principal Stress Angle (at location Z2 defined on PSHELL) |
17 |
Major Principal Stress (at location Z2 defined on PSHELL) |
18 |
Minor Principal Stress (at location Z2 defined on PSHELL) |
19 |
von Mises Stress (at location Z2 defined on PSHELL) |
20 |
Grid Point ID at which stress results are output in the subsequent block. |
21 |
Fiber Distance (at location Z1 defined on PSHELL) |
22 |
Normal XX Stress (at location Z1 defined on PSHELL) |
23 |
Normal YY Stress (at location Z1 defined on PSHELL) |
24 |
Shear XY Stress (at location Z1 defined on PSHELL) |
25 |
Principal Stress Angle (at location Z1 defined on PSHELL) |
26 |
Major Principal Stress (at location Z1 defined on PSHELL) |
27 |
Minor Principal Stress (at location Z1 defined on PSHELL) |
28 |
von Mises Stress (at location Z1 defined on PSHELL) |
29 |
Fiber Distance (at location Z2 defined on PSHELL) |
30 |
Normal XX Stress (at location Z2 defined on PSHELL) |
31 |
Normal YY Stress (at location Z2 defined on PSHELL) |
32 |
Shear XY Stress (at location Z2 defined on PSHELL) |
33 |
Principal Stress Angle (at location Z2 defined on PSHELL) |
34 |
Major Principal Stress (at location Z2 defined on PSHELL) |
35 |
Minor Principal Stress (at location Z2 defined on PSHELL) |
36 |
von Mises Stress (at location Z2 defined on PSHELL) |
37 |
Items 20 to 36 are repeated in sequence for all grid points of the element ID mentioned in item 1. The number of grid points for each element is mentioned in item 3. |
GAUSS results are currently not supported for PCH output.
The type and formatting of stress information printed for 3D elements (CHEXA, CTETRA, and CPENTA) is common. The order of information printed in the .pch file is:
This is the default option for the location argument. The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
Time step |
2 |
Placeholder negative integer (-1). |
3 |
GRID flag |
4 |
Number of Grids at which results are output for the element mentioned in item 1 (set to 0 if only element center results are requested) |
5 |
CENTER flag indicating that element center results are output in the following block. |
6 |
Normal XX Stress |
7 |
Shear XY Stress |
8 |
Major Principal Stress |
9 |
Major Principal X Cosine |
10 |
Mid Principal X Cosine |
11 |
Minor Principal X Cosine |
12 |
Mean Stress |
13 |
von Mises Stress |
14 |
Normal YY Stress |
15 |
Shear YZ Stress |
16 |
Mid Principal Stress |
17 |
Major Principal Y Cosine |
18 |
Mid Principal Y Cosine |
19 |
Minor Principal Y Cosine |
20 |
Normal ZZ Stress |
21 |
Shear XZ Stress |
22 |
Minor Principal Stress |
23 |
Major Principal Z Cosine |
24 |
Mid Principal Z Cosine |
25 |
Minor Principal Z Cosine |
Stress results are output at element center and grid points. The order of information printed in the .pch file is:
Number |
Result Type |
|---|---|
1 |
Time step |
2 |
Placeholder negative integer (-1). |
3 |
GRID flag |
4 |
Number of Grids at which results are output for the element mentioned in item 1 (set to 0 if only element center results are requested) |
5 |
CENTER flag indicating that element center results are output in the following block. |
6 |
Normal XX Stress |
7 |
Shear XY Stress |
8 |
Major Principal Stress |
9 |
Major Principal X Cosine |
10 |
Mid Principal X Cosine |
11 |
Minor Principal X Cosine |
12 |
Mean Stress |
13 |
von Mises Stress |
14 |
Normal YY Stress |
15 |
Shear YZ Stress |
16 |
Mid Principal Stress |
17 |
Major Principal Y Cosine |
18 |
Mid Principal Y Cosine |
19 |
Minor Principal Y Cosine |
20 |
Normal ZZ Stress |
21 |
Shear XZ Stress |
22 |
Minor Principal Stress |
23 |
Major Principal Z Cosine |
24 |
Mid Principal Z Cosine |
25 |
Minor Principal Z Cosine |
26 |
Grid ID indicating that stress results in the subsequent block are output at the specified Grid. |
27 |
Normal XX Stress |
28 |
Shear XY Stress |
29 |
Major Principal Stress |
30 |
Major Principal X Cosine |
31 |
Mid Principal X Cosine |
32 |
Minor Principal X Cosine |
33 |
Mean Stress |
34 |
von Mises Stress |
35 |
Normal YY Stress |
36 |
Shear YZ Stress |
37 |
Mid Principal Stress |
38 |
Major Principal Y Cosine |
39 |
Mid Principal Y Cosine |
40 |
Minor Principal Y Cosine |
41 |
Normal ZZ Stress |
42 |
Shear XZ Stress |
43 |
Minor Principal Stress |
44 |
Major Principal Z Cosine |
45 |
Mid Principal Z Cosine |
46 |
Minor Principal Z Cosine |
47 |
Items 26 to 46 are repeated in sequence for all grid points of the element ID mentioned in item 1. The number of grid points for each element is mentioned in item 3. |
GAUSS results are currently not supported for PCH output.