# Find Evaluation Positions

The main objective of this function is to find the evaluation locations or positions for each of the 1D weld elements. The evaluation positions vary for each weld type.

Evaluation positions are determined based on the evaluation distance calculation specified by the weld regulations.
Note: In the classification area, if the evaluation distance method is set to manual, then the Evaldist value is used to find the evaluation positions.

The following inputs are required to determine the evaluation positions:

1. Evaluation distance
2. Weld width factor
3. Shell thickness
4. Direction vectors for the 1D elements

The calculations to arrive at the evaluations positions for the different types of welds are shown below.

## For T and L Welds

Evaluation Distance
Evaldist = Standard distance from the specification
Weld Width
Weldwidth = Weld Width Factor * Min Shell Thickness
Evaluation Position from Weld Element Centroid
(Thickness / 2.0) + Evaldist + Weldwidth

## For B and O Welds

Evaluation Distance
Evaldist = Standard distance from the specification
Weld Width
Weldwidth = Weld Width Factor * Min Shell Thickness
Evaluation Position from Weld Element Centroid
Evaldist + Weldwidth

Using this relative evaluation distance and the centroid data of the 1D element, the absolute coordinates of the evaluation positions are determined.

For each of these evaluation positions, the nearest shell element and the closest node of the shell element are determined. These entities will be used to get the stress results.

## Evaluation Method

Selection of Evaluation Method, Nominal or Hotspot, calculates evaluation distance with one or two points. Nominal or Hotspot method is regulation independent and can be applied to any regulation (Specification Context) or weldline (Points Context).

Applying Evaluation Method in Specification context, assigns the selected Method, Nominal/ Hotspot, to each weldline in Points context.

## Evaluation Distance with 1 Point

Auto evaluation distance calculation
Example: T weld
Method: Auto

L1 = (Shell Thickness / 2.0) + Evaldist 1 + Weldwidth

where,

Evaldist1
Constant1 * Min Shell Thickness
Weld Width
Weld Width Factor * Min Shell Thickness
Weld Width Factor (default) = 1
Stress
Stress is queried from Element at L1
Note: For Manual Distance, L1 is directly specified by the user.

## Evaluation Distance with 2 Points

Auto evaluation distance calculation
Example: T weld
Method: Auto

L1 = (Shell Thickness / 2.0) + Evaldist 1 + Weldwidth
L2 = (Shell Thickness / 2.0) + Evaldist 2 + Weldwidth

where,

Evaldist 1
Constant1 * Min Shell Thickness
Evaldist 2
Constant2 * Min Shell Thickness
Weld Width
Weld Width Factor * Min Shell Thickness
Weld Width Factor (default) = 1
Extrapolated Stress
Constant2 (Stress at L1) - Constant1 (Stress at L2)
Stress at L1
Stress is queried from Element at L1
Stress at L2
Stress is queried from Element at L2
Note:
• For Manual Distance, L1 and L2 is directly specified by the user.
• When evaluating with element data, the stress is taken from the closest element centroid. This is not necessarily matching the exact evaluation distance.
• For an evaluation of solid welds, an evaluation distance with two points is supported for DVS1608, DVS1612, EuroCode 3, and FKM only.

## Evaluation Distance with Corner Data

When evaluating with corner data, stress interpolation (method: Inverse distance weighting) is employed to average the stress from corner data of the element to the required evaluation point in both auto and manual methods.

## Evaluation Distance per Component

Nominal and Hotspot evaluation distances are exposed for each weld direction/component in Points Context. Stress query for Transverse, Longitudinal and Shear will be based on the total distance calculated from the evaluation distance formulae listed for 1 Point or 2 Point approach.