Fractographic analysis revealed that fatigue fracture surfaces consist of a fatigued region and a fast fracture region.
This chapter presents an analytical method of determining safe weld excavation lengths, preventing both plastic collapse and fast fracture of the pipe during weld defect repair.
The failure was the result of fast fracture through both shock tubes at the location where the tubes were press fit into the shock upper crown.
Assuming a fast cleavage model of fracture, Ta, Re, Os and W are predicted to have a weak strengthening effect on Mo for the Σ5 310) tilt GB, and Mn, Fe, Co and Nb are predicted to have reasonable strengthening effects for the Σ5(100) twist GB.
A combination of factors lead to LCP fracture and these include: brittle crack initiation due to phosphorus, segregation at grain boundaries, crack propagation due to cyclic loading and final fast fracture favored by the loss of ductility due to cold work.
To place fatigue fracture in context, we apply monotonic, static, and cyclic load, and observe three types of fracture behavior: fast fracture, delayed fracture, and fatigue fracture.
The BAS said it was confident of mounting a fast uplift of personnel during summer months should the fracturing of the ice shelf occur.
This was further confirmed by observations of delamination in the fast fracture domain.
This fast turnover also results in a fast development of new wells drilled in unconventional gas fields aside from re-fracturing old wells.
Based on fracture mechanics, and an estimate of the bending stress from a 1-m drop, it is confirmed that the fatigue cracks present on the fracture surface were large enough to induce fast fracture.
WASHINGTON -- The Obama administration, seeing increased domestic natural gas production as a linchpin in its long-term energy strategy, has named a panel of experts to find ways to make hydraulic fracturing, a fast-growing method of extracting natural gas, safer and cleaner.
