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.
Desired Number of Cycles (N)
Desired number of cycles to be used in case the range data file is not
provided.
Location Wise Parameters
Note: Where ‘X’ in the below parameters can be any evaluation location from 1-10.
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
Formulation
Stress Component Considered for Evaluation
ΔσT - Transverse component (perpendicular to the axis of the
weld)
ΔσL - Longitudinal component (parallel to the axis of the
weld)
Δτ - Shear component
Corrected Weld Detail Category
Where:
- Weld detail category before correction.
Note: The above formulas are for the normal component. Similar formulas
are applicable to other shear components as well.
Calculation of the Assessment Stress
In the case of Eurocode, stress range is used as assessment stress.
Fatigue Limit Calculation (ΔσD)
For Normal Component:
For Shear Component:
Where:
Δσc - Corrected stress range value
ND - Number of cycles at fatigue limit
mD - Slope at fatigue limit
Cutoff Limit Calculation (ΔσL)
For Normal Component:
For Shear Component:
Where:
Δσc - Corrected stress range value
ΔσD - Fatigue limit stress value
ND - Number of cycles at fatigue limit
NL - Number of cycles at cutoff limit
mL - Slope at cutoff limit
Permissible Number of Cycles (Nperm)
Damage Calculation
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)
Where:
- Damage in longitudinal direction (parallel to the
axis of the weld)
- Damage in transverse direction (perpendicular to the
axis of the weld)
- Damage in the shear direction
Calculation of Accumulated Damage
For the corresponding damage components:
For resultant accumulated damage calculation:
Note: DIN is the copyright owner for EN 1999-1-3:2011-11 (November
2011). Permission to use and reproduce information contained in the
Eurocode 3 standards was granted by DIN.