Strain-Life Method Material Fatigue Data
Description: Specifies material property data needed for fatigue analysis. This entry is used if a MAT1, MAT2, MAT8, MAT9, or MAT12 entry is specified with the same MID.
Format:
Example:
| Field | Definition | Type | Default |
|---|---|---|---|
| MID | Identification number of a MAT1, MAT2, MAT8, MAT9, or MAT12 entry. | Integer > 0 | Required |
| SF | Coefficient of fatigue strength. See Remark 3. | Real > 0.0 | See Remark 2 |
| EF | Coefficient of fatigue ductility. See Remark 3. | Real > 0.0 | See Remark 2 |
| B | Exponent of fatigue strength. See Remark 3. | Real > 0.0 | See Remark 2 |
| C | Exponent of fatigue ductility. See Remark 3. | Real > 0.0 | See Remark 2 |
Remarks:
- ENDATA entries must all have unique set identification numbers.
- VFATIGUE and FATIGUE entries provide defaults to ENDATA. Values not specified on ENDATA entries will be replaced with ones from the VFATIGUE or FATIGUE entry STRAIN continuation.
- The
curve shown in Figure 1 is characterized by the equation:
where,
is the range of strain (
-
)
is the number of cycles to failure
is the modulus of elasticity
Figure 1. Strain-Life Curve Format