K = 85 MPa√m < KIC = 100 MPa√m
K = (σ√(πa)) * Y
where da/dN is the crack growth rate, C and m are material constants, and ΔK is the stress intensity factor range. principles of fracture mechanics rj sanford pdf pdf work
da/dN = C * (ΔK)^m
where Y is a geometric factor that depends on the crack configuration and the component geometry. K = 85 MPa√m < KIC = 100
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.
The team decided to apply the principles of fracture mechanics to analyze the failure. They used the stress intensity factor (K) to characterize the stress field around the crack tip. As a result, the weld region had a
The team also used the fracture toughness (KIC) to determine the critical stress intensity factor for the material. The fracture toughness is a measure of a material's resistance to fracture, and is defined as: