# FKM

Version: 6^{th} Edition 2012

## List of Classification Parameters

- 1st Evaluation Distance
- Reference distance value for the 1st evaluation location from the weld element at which the stress values are extracted.
- 2nd Evaluation Distance
- Reference distance value for the 2nd evaluation location from the weld element at which the stress values are extracted.
- Weld Width
- Width of the weld material from the web wall. This parameter is ignored if
specifying the evaluation distance is done manually.Note: Refer to - Find Evaluation Positions.
- Material Type
- Parameter to specify the material of shells. Options: steel, al.
- Notch Class - Transverse Location_X
- Notch class definition considered for the fatigue limit calculation for the
normal stress component in the transverse direction (perpendicular to the
axis of the weld) at ‘X’.Note: Where ‘X’ can be any evaluation location.
- Notch Class - Longitudinal Location_X:
- Notch class definition considered for the fatigue limit calculation for the normal stress component in the longitudinal direction (parallel to the axis of the weld) at ‘X’.
- Notch Class - Shear Location_X
- Notch class definition considered for the shear stress component at ‘X’.
- Material Yield - Location_X
- Material yield value used for the static evaluation.
- Residual Stress factor (KEnormal)
- Residual stress factor used for calculations for the normal components of stress.
- Residual Stress factor (KEtau)
- Residual stress factor used for calculations for the shear components of stress.
- Mean Stress sensitivity (Mnormal)
- Mean stress sensitivity factor used for calculations for the normal components of stress.
- Mean Stress sensitivity (Mtau)
- Mean stress sensitivity factor used for calculations for the shear components of stress.
- Overload Situation
- Parameter to decide overload situation. Options: F1, F2, F3, F4. Based on the selection, the fatigue limit calculation formula may vary.
- Reference Number of Cycles (Nc)
- Reference number of cycles for welded components.
- Number of Cycles at Knee point - Normal (Ndnormal)
- Number of cycles at knee point of normal component constant amplitude S-N curves.
- Number of Cycles at Knee point - Shear (Ndtau)
- Number of cycles at knee point of shear component constant amplitude S-N curves.
- If Edge - Layer solidification
- Possible options are yes or no.
- Slope Exponent – Normal
- Slope exponent for the normal component of constant amplitude S-N curves.
- Slope Exponent – Shear
- Slope exponent for the shear component of constant amplitude S-N curves.
- If Material GJL
- Parameter used to indicate GJL behavior.
- Material GJL factor (Knle)
- Constant allowing for the non-linear elastic stress-strain behavior of GJL.
- Exponent N for thickness
- Thickness Factor
- Temperature Factor (Ktd)
- Solidification Factor (Kv)
- Plastic Support (npl)
- Weld Line Factor (aw)
- Softening Factor (Pwez)
- Material Safety Factor (jF)
- Load Safety Factor (jS)

## Static Assessment

The following process is followed for Static assessment:

- Collect the max. absolute Stresses in transverse and shear component (${\sigma}_{x};\tau $ ) across all assigned loadcases.
- Calculate Equivalent Static Stress (${\text{\sigma}}_{VW}$ ) with transverse and shear component.
- Retrieve the material yield (Rp) value from the Points context.
- Calculate Static Strength (
${\text{\sigma}}_{SK,W}$
)$${\text{\sigma}}_{SK,W}=Rp*{\alpha}_{w}\text{*}{n}_{pl}\text{*}{\rho}_{WEZ}$$
- ${a}_{w}$ = Weld Factor
- ${n}_{pl}$ = Plastic support factor
- ${\rho}_{WEZ}$ = Softening factor

- Calculate static utilization (
${a}_{SK}$
)$${a}_{SK}=\frac{{\text{\sigma}}_{VW}}{{\text{\sigma}}_{SK,W}/{\gamma}_{Stat}}$$
- ${\gamma}_{Stat}$ = Static Safety factor