I/O Options and Subcase Information Entry Used in the I/O Options or Subcase Information sections to request output of fatigue life results for all fatigue subcases or individual fatigue subcases, respectively.


LIFE (format_list, THRESH=thresh, RTHRESH=rthresh, TOP=topn, RTOP=rtop, SUBSYS=SUBSYS_ID) = option


Argument Options Description
format <H3D, OPTI, blank>
Results are output in Hyper3D format (.h3d file).
Results are output in OptiStruct results format (.fat file).
blank (Default)
Results are output in all active formats for which the result is available.
THRESH <thresh>

Default = blank (Real)

Specifies an absolute threshold under which Life results should not be output.
RTHRESH <rthresh>

Default = blank (0.0 < Real < 1.0)

Specifies a relative threshold as a fraction of the total life under which results should not be output. For example, if L is the total life in the model, then life results below L*rthresh are excluded from the output.
TOP <topn>

Default = blank (Integer > 0)

Only the top “topn” life values should be output.
RTOP <rtopn>

Default = blank (0.0 < Real < 1.0)

Only the top fraction (“rtop”) of the total number of life values should be output. For example, if LTOT is the total number of life values in the model, then only the top LTOT*rtop values are output.

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.
option <YES, ALL, NO, NONE, SID>

Default = ALL

YES, ALL, blank
Results are output for all elements.
Results are not output.
If a set ID is given, results are output only for elements listed in that set.


  1. When a LIFE command is not present, fatigue life results are not output.
  2. 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.
  3. Multiple instances of this card are allowed. If instances are conflicting, the last instance dominates.