Calculate accumulated fatigue damage from stress amplitude and stress cycles data using Miner's rule (DNVGL-RP-C203 section 2.2).
Enter stress values as comma separated pairs (nominal stress, number of cycles), with each pair on a new line. Use the thickness exponent and stress concentration factor options to calculate the hot spot stress amplitude.
Tool Input
- jointtype : Joint Or Material Type
- csntype : SN Curve Type
- walltype : Weld Joint Type
- tru : User Defined Reference Thickness
- kfactype : Thickness Exponent Type
- ku : User Defined Thickness Exponent
- scftype : Stress Concentration Factor Type
- SCFu : User Defined Stress Concentration Factor
- dfftype : Design Fatigue Factor Type
- DFFu : User Defined Design Fatigue Factor
- ratype : Forging Surface Roughness Type
- temptype : Temperature Derating Type
- Tu : User Defined Design Temperature
- systype : System Effect Factor Type
- Rsu : User Defined System Effect Log Factor
- Sdata : Nominal Stress Data Values (Without SCF)
- Ndata : Number Of Cycles Data Values
- tn : Wall Thickness
Tool Output
- η : Usage Factor (= 1 / DFF)
- D* : Unit Accumulated Fatigue Damage
- DFF : Design Fatigue Factor
- N : Total Number Of Cycles
- Rm : Material Thickness Derating Log Factor
- Rs : System Effect Log Factor
- Rt : Temperature Derating Log Factor
- SCF : Stress Concentration Factor
- Smax : Maximum Stress Amplitude (With SCF)
- k : Thickness Exponent
- tref : Reference Thickness