Annex 9D Weld Residual Stress Distribution

The Annex 9D weld residual stress distribution profiles are implemented at the weld centerline. Checking the box "Include Annex 9D weld residual stress distribution" will display a series of selections for determining the applicable profile from Annex 9D

Stress Profiles Data Entry

The top portion of this screen is used to enter the stress profiles in the through thickness direction. Eight blank boxes for pasting columns of data are provided to enter the stress profiles into the software.  The software allows for updating of individual columns.

All columns entered must contain numeric values and have the same number of rows.

x REQUIRED

Paste in the x values in the requested units (inch or mm) in a column format into this "paste box". This data is required.

These values are the through wall thickness position, which must range from 0 to the wall thickness. The software will use the maximum entered value in this column as the wall thickness. Note that the x = 0 position is indicated on the illustration in the Geometry Data Entry Screen (once a Geometry has been selected).

Analysis Case 1

The FFSWeb software allows modeling of load cycling using up to two stress profiles for crack growth simulation. Each Analysis Case requires definition of a Max and Min stress profile. These stress profiles should contain the Maximum and Minimum combined Simultaneous Primary and Secondary Stresses. 

If compressive residual stresses are to be modeled, then these stresses must be entered in the Min FEA Stress Profile column and also included as part of the Max FEA Stress Profile, and the box indicating this should be checked.

If the fracture mechanics approach is limited to a FAD stability assessment, these profiles are not required as long as the Max Primary Stress profile is entered.

Max Stress Profile

Paste in the Maximum Stress Values in the requested units (psi or MPa) in a column format into this "paste box".

Data should be in the direction of max principal stress at each nodal point.

Min Stress Profile

Paste in the Minimum Stress Profile in the requested units (psi or MPa) in a column format into this "paste box".

Data should be in the direction of min principal stress at each nodal point.

Primary Only Stress Profile

Paste in the Maximum Primary Stress Profile in the requested units (psi or MPa) in a column format into this "paste box".

Data should be in the direction of max principal stress at each nodal point.

This profile is used for the FAD assessment. If the Max Stress Profile for Analysis Case 1 includes Primary and Secondary stresses, it is important for this profile to be entered for the software to accurately model the maximum primary only loads for the FAD assessment. If this profile is left blank, then the Max and Min Analysis Case 1 Stress Values are used to determine the max primary stress profile.

If the fracture mechanics approach is to be limited to a FAD stability assessment, then the Analysis Case 1 profiles are not required as long as the Max Primary Stress Profile is entered.

Secondary (Thermal) Only Stress Profile

Paste in the Maximum Secondary (Thermal) Stress Profile in the requested units (psi or MPa) in a column format into this "paste box".

Data should be in the direction of max principal stress at each nodal point.

This profile is used for the FAD assessment as it is included in the total secondary/residual stress profile.

Analysis Case 2

The FFSWeb software allows modeling of load cycling using up to two stress profiles for crack growth simulation. Each Analysis Case requires definition of a Max and Min Stress Profiles. These stress profiles should contain the Maximum and Minimum combined Simultaneous Primary and Secondary Stresses. 

Analysis Case 2 should be smaller in magnitude than Analysis Case 1, so that the Analysis Case 2 stresses are bounded by Analysis Case 1 stress values.

Max Stress Profile

Paste in the Maximum Stress Values in the requested units (psi or MPa) in a column format into this "paste box".

Data should be in the direction of max principal stress at each nodal point.

Min Stress Profile

Paste in the Minimum Stress Profile in the requested units (psi or MPa) in a column format into this "paste box".

Paste Button

The paste button on this page will populate the Profiles Data tables, to be used in the Fracture Mechanics simulation. Any existing columns of data will be overwritten.

Profiles Entered Data

Display area for the populated data which is to be used in the Fracture Mechanics simulation.

Clear Buttons

The clear buttons below each column of data are used to delete that particular profile.