The .op2 file is a Nastran output2 format for model and results data.
This file is created when the O2, OUT2, or OUTPUT2 formats are chosen. (See documentation for the I/O options FORMAT and OUTPUT).
Result |
Description |
|
Acceleration |
Acceleration results from frequency response, transient response, and multi-body dynamics analyses. Output is controlled by the I/O option ACCELERATION. |
|
Composite ply strain |
Ply strain results for composite materials from static analyses. Output is controlled by the I/O option CSTRAIN and by the SOUTi field on the PCOMP definition. |
|
Composite ply stress |
Ply stress results for composite materials from static analyses. Output is controlled by the I/O option CSTRESS and by the SOUTi field on the PCOMP definition. |
|
Composite failure indices |
Failure indices for composite materials from static analyses. Output is controlled by the I/O option CSTRESS, by the SOUTi, SB and FT fields on the PCOMP definition, and by the related fields on the relevant material definition (see MAT1, MAT2, MAT8). |
|
Density |
Density results from topology optimizations. Output is controlled by the I/O option DENSITY. Note: Density results are reported as von Mises Strains. |
|
Displacement |
Displacement results from static, frequency response, transient response, and multi-body dynamics analyses. Output is controlled by the I/O option DISPLACEMENT. |
|
Eigenvector |
Eigenvector results from normal modes and linear buckling analyses. Output is controlled by the I/O option DISPLACEMENT. |
|
Single-point force of constraint |
Single-point force of constraint results from static analyses. Output is controlled by the I/O option SPCFORCE. |
|
Strain |
Strain results from static, frequency response, transient response, and multi-body dynamics analyses. Output is controlled by the I/O option STRAIN. |
|
Stress |
Stress results from static, frequency response, transient response, and multi-body dynamics analyses. Output is controlled by the I/O option STRESS (or ELSTRESS). |
|
Velocity |
Velocity results from frequency response analyses, transient response, and multi-body dynamics. Output is controlled by the I/O option VELCOITY. |
The I/O option RESULTS controls the frequency of output for analytical results during an optimization.
In addition to the analysis and optimization results, the finite element model description (nodes, elements, coordinates systems, and properties) is written to the .op2 file. This model can be read by HyperView and fatigue codes. To turn off the model output, use the NOMODEL option on OUTPUT, OP2.
To be able to read the model directly from the .op2 file, newer versions of FEMFAT, Medina (7.4.8 or newer), and Animator (3.0.6.6c or newer) must be used.
For dynamic analyses like frequency response, transient response, and multi-body dynamics, it is recommended that sets be used to reduce the amount of model and results output data. The output file can become very large since results are output for each frequency or time step.