Eurocode 3
List of Classification Parameters
- Evaluation Distance
- Reference distance to find the 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.
- Safety Factor (Gmf)
- Used in calculation of the corrected weld detail category.
- Fatigue Limit Slope - Normal Stress (Md)
- Slope of the curve at the fatigue limit for normal stress components of tensor. Refer to location 2 in the graph.
- Fatigue Limit Slope - Shear Stress (Md)
- Slope of the curve at the fatigue limit for shear stress components of tensor. Refer to location 2 in the graph.
- Cutoff Limit Slope - Normal Stress (Ml)
- Slope of the curve at the cutoff limit for normal stress components of tensor. Refer to location 3 in the graph.
- Cutoff Limit Slope - Shear Stress (Ml)
- Slope of the curve at the cutoff limit for shear stress components of tensor. Refer to location 3 in the graph.
- Number of Cycles at Fatigue Limit (Nd)
- Number of cycles in the S-N curve at the fatigue limit.
- Number of Cycles at Cutoff Limit (Nd)
- Number of cycles in the S-N curve at the cutoff limit.
- Desired Cycles Detail From
- Parameter that will show where HL-WC is reading the desired number of cycles from.
Location Wise Parameters
- Weld Detail Category - Transverse Location_X
- Weld detail category from the image below that will be considered for the calculation of fatigue and cutoff limits of the normal stress component in the transverse direction (perpendicular to the axis of the weld) at ‘X’.
- Weld Detail Category - Longitudinal Location_X
- Weld detail category from the image below that will be considered for the calculation of fatigue and cutoff limits of the normal stress component in the longitudinal direction (parallel to the axis of the weld) at ‘X’.
- Weld Detail Category - Shear Location_X
- Weld detail category from the image below that will be considered for the calculation of fatigue and cutoff limits of the shear stress component at ‘X’.
- Material Yield - Location_X
- Material yield value used for the static evaluation.
Symbols
- Weld detail category (Normal) - Δσc
- Weld detail category (Shear) - Δτc
- Safety factor for strength - γMf
Static Assessment
- Retrieve the six components of stress from the element at the evaluation location.
- Calculate the von Mises stress value using these stress components.
- Retrieve the material yield value from the Points context.
- Determine the static strength ratio: element von Mises stress / material yield value
Formulation
- Stress Component Considered for Evaluation
- ΔσT - Transverse component (perpendicular to the axis of the weld)
- Corrected Weld Detail Category
- Δσc(Corrected)=Δσc,BasicγMf
- Calculation of the Assessment Stress
- In the case of Eurocode, stress range is used as assessment stress.
- Fatigue Limit Calculation (ΔσD)
- For Normal Component: ΔσD=Δσc·(2,0e+6ND)(1/mD)
- Cutoff Limit Calculation (ΔσL)
- For Normal Component: ΔσL=ΔσD·(NDNL)(1/mL)
- Permissible Number of Cycles (Nperm)
- If Δσ≥ΔσD Nperm=ND·(ΔσΔσD)(−mD)If ΔσD>Δσ≥ΔσL Nperm=NL·(ΔσΔσL)(−mL)If Δσ<ΔσL Nperm=∞
- Damage Calculation
-
D=NNperm
Where:
- N - Desired number of cycles per load case combination, derived either from the range data file or the classification area.
- Resultant Damage Calculation (D)
-
D=12 · (|Dδ,x+Dδ,y|+√(Dδ,x−Dδ,y)2+4 · Dτ,xy2)<1.0
Where:
- Dδ,x - Damage in longitudinal direction (parallel to the axis of the weld)
- Dδ,y - Damage in transverse direction (perpendicular to the axis of the weld)
- Dτ,xy - Damage in the shear direction
- Calculation of Accumulated Damage
- For the corresponding damage components:
Dδ,x,acc=∑Dx,iDδ,y,acc=∑Dy,iDτ,xy,acc=∑Dxy,i
EN 1999-1-3:2011-11 (November
2011)
. Permission to use and reproduce information contained in the
Eurocode 3 standards was granted by DIN.