.cstr file

The .cstr file is an OptiStruct ASCII format results file.

File Creation

This file is created when the OPTI, OS or BOTH formats are chosen. (See documentation for the I/O Option OUTPUT).

File Contents

Result Description
Composite stress or strain Composite stress, composite strain, and composite failure results from linear static and normal modes analyses are output to the .cstr file.

Output is controlled by the I/O Options CSTRESS, CSTRAIN or CFAILURE. On PCOMP, SOUT=YES needs to be selected.

File Format

The composite stress file format is self-explanatory. It gives the stress, strain and composite failure for each element and its plies.


  1. The I/O Option Previously Supported Results controls the frequency of output for analytical results during an optimization.