Fatigue User’s Guide > Total Life and Crack Initiation > FEFAT Batch Operation
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FEFAT Batch Operation
FEFAT Batch Operation for Preprocessor Option
FEFAT can be operated in batch mode also with the following keywords:
 
/OPT=P
To specify preprocessing option.
/INPut
The name of the input file, usually the jobname for the global multi‑node/element analysis run.
/OUTput
The name of the file where the results will be stored. A default answer of the input file name will be offered (Note: the output file type is jobname.fpp).
/OVerwrite
Forces an overwrite of any output file with the same name as that specified by the user.
/TIMe history
The name of the loading time history for load case n. This is ignored if a transient analysis is used. If more than one time history is involved, use this keyword multiple times for each time history. They must be entered in the proper ascending order corresponding to the load case numbers.
/UNIts
The equivalent units for the analysis.
/NUNits
The number of equivalent units.
/SIZE
The size of the rainflow matrix created by FEFAT may be specified. The size may be 32, 64 or 128. The high the number, the more accurate the results, however computational speed is the price paid. The default size is 32.
/STIM
If a single node or element has been indicated for processing, the ability to output a stress time history exists. Specify YES or NO with this parameter. If YES, a jobnamenn.dac file will be created which can be viewed in PTIME, where nn is the node/element number.
/ANAlysis
Answering YES here will cause the fatigue analyzer of FEFAT, to start immediately after the preprocessing has completed.
/*=TT
If the user wishes to see output sent to the screen, he must include this parameter exactly as shown. Any value other than TT after the equal sign will send the output to a file by that name.
Example:
fefat /opt=p/inp=mymodel/ov=yes/tim=load1/anal=yes
This batch line would open mymodel.fes and use a time history called load1.dac. Any files existing with the same name as the output files created would be overwritten. The FE-Fatigue Analyzer option of FEFAT, is automatically started after termination of the preprocessor.
FEFAT Batch Operation for Analysis
If the fatigue analysis is initiated from the preprocessor option, these keywords will not be required.
 
/OPT=F
To specify fatigue analysis option.
/INPut
The name of the input preprocessed data file, usually the jobname for the global multi-node/element analysis run.
/OUTput
The name of the file where the results will be stored. A default answer of the input file name will be offered. (Note that the output file type is .fef.)
/OVerwrite
Forces an overwrite of any output file with the same name as that specified by the user.
/*=TT
If the user wishes to see output sent to the screen, he must include this parameter exactly as shown. Any value other than TT after the equal sign will send the output to a file by that name.
Example:
fefat /opt=f/inp=mymodel/ov=yes
FEFAT Batch Operation for Factor of Safety
Most of the batch keywords are presented here; however, not all of them are described. To find the appropriate batch keyword for the operation(s) enter FEFAT and use the Help of Question available under Help pull-down menu with the field of interest highlighted or active to find out what the batch keyword is. At the end of each help page that is displayed, is the keyword for that option.
 
/OPT=S
To specify factor of safety analysis option.
/JOBname=
This is the name of the job to run (/JOB=myjob)
/LOCation=
This is the node or element number. Can be “ALL”. (/LOC=13)
/ANALysis=
This is the analysis type: Stress or Life-based. (/ANAL=S)
/LIFE=
The design life. (/LIFE=1000)
/MAXFAC=
The maximum factor. (/MAXFAC=100)
/USECUT=
Use material cutoff (YES/NO). (/USECUT=Y)
/OUTput=
The output file name (jobname.fos). (/OUT=myjob)
/STRESS=
The reference stress. (/STRESS=50)
/OV=
Overwrite flag if an existing file is to be overwritten. (/OV=Y)
Example:
fefat /opt=s/job=myjob/anal=l/loc=all/out=myjob/ov=y /life=1000/maxfac=8/usecut=y
This example will run FEFAT in batch and will use the file myjob.fpp in a life‑based factor of safety analysis with the design life set to 1000, the maximum factor allowed set at 100 and will use the material cutoff in the calculation. The results will be written to the file myjob.fos and, if it exists, will be overwritten.
FEFAT Batch Operation for Utilities
/OPT=U
To specify utility option.
/UOPTion=
The options are A, B, L, C, V, and R corresponding to the submenu picks under the utilities menu.
/OUTput=
Output file name. Only the jobname need be input. A file suffix of ASC or FES is assumed depending on the main menu option. The default is the input jobname.
/INPut=
The input file name. This is usually the jobname. A file suffix of ASC or FES is assumed depending on the main menu option.
/OVerwrite=
This parameter sets automatic overwrite of existing files on or off.
/OV=Y sets overwrite on. /OV=N sets overwrite off. Off is the default.
/*=TT
If it is desirable to see output sent to the screen this parameter can be included exactly as shown. Any value other than TT after the equal sign will send output to a file by that name.
Example:
fefat /opt=u/uopt=a/inp=mymodel/out=mymodel/ov=y/*=tt
This example selects the utility option in FEFAT and executes the submenu option of creating an ASCII file from a binary file (A), with a jobname of mymodel. It will search for a file called mymodel.fes and create an output file called mymodel.asc.