Creo Simulate > Creating Analyses > Structural Analysis > Fatigue Analysis > About the External Fatigue Material File
About the External Fatigue Material File
The external fatigue material file is a text file with a .mat extension. It defines additional material properties for a fatigue analysis. Set the sim_fatigue_external_matadata configuration option to yes, to specify an external fatigue material file for a fatigue analysis. You can define multiple external material files for a single fatigue analysis. The names of the material files must match the material names that you assigned to your model.
Use the following keywords and values to define an external fatigue material file:
Keyword
Property
Range Of Values
UTS
ultimate tensile strength*
100 to 4000 MPa
YOUNG_MODULUS
elastic modulus*
20000 to 300000 MPa
YS
yield strength*
50 to 3000 MPa
ME
elastic poisson’s ratio
0.25 to 0.35
MP
plastic poisson’s ratio
0.45 to 0.55
SF_PRIME
fatigue strength coefficient*
50 to 4000 MPa
B
fatigue strength exponent
-10.0 to -0.002
EF_PRIME
fatigue ductility coefficient
0.001 to 10.0
C
fatigue ductility exponent
-1.2 to -0.15
N_PRIME
cyclic strain hardening exponent
0.005 to 0.5
K_PRIME
cyclic strength coefficient*
50 to 12000 MPa
RC
cut-off cycles
1.0E5 to 1.0E25
SEE
standard error of log(e) (elastic)
0.0 to 10.0
SEP
standard error of log(e) (plastic)
0.0 to 10.0
SEC
standard error of log(e) (cyclic)
0.0 to 10.0
Note the following points when defining the external fatigue material file:
Properties marked with an asterisk (*) must be in stress units defined in the principal system of units.
The keywords and values must be separated by “=”.
You can add the keywords in any order.
You can either use all, or a subset of the list of keywords in a single material file.
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