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The dynamic fracture toughness was determined for two titanium alloys (Ti-6A1-4V and Ti-6A1-6V-2Sn) from different suppliers and in various heat-treated conditions. The strain-rate effect associated with the dynamic test is shown to increase the fracture toughness for all the alloys with the exception of mill-annealed and duplex-annealed Ti-6A1-6V-2Sn, where the fracture toughness was found to be independent of strain rate. Dial energy per unit specimen area (W/A)d for precracked Charpy specimens can be used to calculate KId as long as a relatively flat fracture appearance (small shear area) is obtained. Otherwise, when a large amount of shear is present, the energy to maximum load (W/A)m or Pmax from the load-time trace must be used to calculate KId.
impact tests, strain rate, static fracture toughness, dynamic fracture toughness, inertia loads, instruments, dynamic calibration, dial energy, energy to maximum load
California State University, Long Beach, Calif.
Head, Metallurgy Research, Materials Sciences Laboratory, The Aerospace Corporation, El Segundo, Calif.