Fitness-for-Service Analysis Procedure – Determine Stress Intensity at Flaw

1. Using the principal membrane and bending stresses calculated above, calculate the stress intensity at the flaw (KI) using the following equation:

Mm = correction factor for membrane stress (see Figure 700-2 for subsurface flaws; Figure 700-3 for surface flaws)
Mb = correction factor for bending stress (see Figure 700-4 for subsurface flaws; Figure 700-5 for surface flaws)

Shape Factors for Flaw Model

Bending Stress Correction Factor for Subsurface Flaws

Bending Stress Correction Factor for Surface Flaws

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