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Power Cable SCF for fatigue analysis
Fatigue shall be calculated in 1st and second armour (ARM1 and ARM2) and conductor (COND1) (but not in metallic screen with very high fatigue life).
The axial and bending SCF input in DLW are calculated as follows: * Outer diameter \(D\) (stress post-processing outer diameter). This value is arbitrary but the calculation takes into account this value and other values should be consistent with this one. * Stress area \(A\) * Young modulus \(E\) * Axial stiffness \(EA\) (IAC equivalent properties) * Axial stiffness \(EA’= E * A\) (stress post processing in DLW)
| Component | Curvature Kc [Pa/(1/m)] | Tension Kt [Pa/N] |
|---|---|---|
| ARM1 | \(Kc_{ARM1}\) | \(Kt_{ARM1}\) |
| ARM2 | \(Kc_{ARM2}\) | \(Kt_{ARM2}\) |
| COND1 | \(Kc_{COND1}\) | \(Kt_{COND1}\) |
| Metallic Screen | \(Kc_{MS}\) | \(Kt_{MS}\) |
- The values used as input in DLW are calculated as follows:
\(SFb_{DLW}\) is the bending SCF
\(SFa_{DLW}\) is the axial SCF
Once SCF are calculated, the fatigue analysis can be done using rainflow counting as described here.
