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.op2 file

.op2 file

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.op2 file

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The .op2 file is a Nastran output2 format for model and results data.

File Creation

This file is created when the O2, OUT2, or OUTPUT2 formats are chosen. (See documentation for the I/O Option OUTPUT).

File Contents

Result

Description

Acceleration

Acceleration results from frequency response, acoustic, 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 element strain energy.

Displacement

Displacement results from static, frequency response, acoustic, 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.

Element energy
loss per cycle

Element energy loss per cycle and energy loss per cycle density output from frequency response analysis.

Output is controlled by the I/O Option EDE.

Element force

Element force results from static, frequency response, acoustic, and transient response analyses.

Output is controlled by the I/O Option FORCE (or ELFORCE).

Element kinetic energy

Element kinetic energy and kinetic energy density output from frequency response analysis.

Output is controlled by the I/O Option EKE.

Element strain energy

Element strain energy and strain energy density results from static, normal modes, frequency response, and transient response analyses.

Output is controlled by the I/O Option ESE.

Grid point stress

Grid point stress results for 3D elements from static analyses.

Output is controlled by the I/O Option GPSTRESS (or GSTRESS).

MPC force

Multi-point force of constraint results from static, frequency response, acoustic, and transient response analyses.

Output is controlled by the I/O Option MPCFORCE.

PSD element strain

Power spectral density function of element strains from random response analysis.

Output is controlled by the I/O Option STRAIN.

PSD element stress

Power spectral density function of element stresses from random response analysis.

Output is controlled by the I/O Option STRESS.

RMS element strain

Root mean square value of element strains from random response analysis.

Output is controlled by the I/O Option STRAIN.

RMS element stress

Root mean square value of element stresses from random response analysis.

Output is controlled by the I/O Option STRESS.

SPC force

Single-point force of constraint results from static, frequency response, acoustic, and transient response analyses.

Output is controlled by the I/O Option SPCFORCE.

Strain

Strain results from static, frequency response, acoustic, transient response, and multi-body dynamics analyses.

Output is controlled by the I/O Option STRAIN.

Stress

Stress results from static, frequency response, acoustic, transient response, and multi-body dynamics analyses.

Output is controlled by the I/O Option STRESS (or ELSTRESS).

Velocity

Velocity results from frequency response, acoustic, transient response, and multi-body dynamics analyses.

Output is controlled by the I/O Option VELOCITY.

Comments

1.The I/O Option RESULTS controls the frequency of output for analytical results during an optimization.
2.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.
3.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.
4.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.