The team integrated this equation over the number of pressure cycles to estimate the final crack length:
KIC = σ√(πac)
The investigation revealed that the pipeline had been fabricated using a welding process, and that the weld had not been properly heat-treated. As a result, the weld region had a higher yield strength and a lower toughness than the base metal. principles of fracture mechanics rj sanford pdf pdf work
where ac is the critical crack length.
The team recommended that the pipeline be replaced with a new one, fabricated using a improved welding process and inspected regularly using non-destructive evaluation techniques. The team integrated this equation over the number
where σ is the applied stress, a is the crack length, and π is a constant. a is the crack length