Principles Of Fracture Mechanics Rj Sanford Pdf Pdf Work -

The stress intensity factor is a measure of the stress field around a crack tip, and is defined as:

da/dN = 10^(-10) * (50 MPa√m)^2.5 = 2.5 * 10^(-5) inches/cycle

K = (σ√(πa)) * Y

The team used the following equation to calculate the stress intensity factor:

KIC = σ√(πac)

where σ is the applied stress, a is the crack length, and π is a constant.

K = σ√(πa)

The team concluded that the pipeline had failed due to a fatigue crack that had grown to a critical size. The crack had formed in the weld region, which had a lower toughness than the base metal.