Understanding rate sensitivity in dual phase titanium alloys - a combined experimental and computational micro-pillar study

摘要

Titanium alloys are used as structural load bearing components in aeroengines. In service, these alloys are subjected to significant cyclic loading, with high thrust (i.e. stress) excursions during takeoff, a load-hold during flight and unloading on landing. The load-hold has been shown to have a significant effect on the fatigue life performance of many dual phase titanium alloys, where a significant hold at maximum load can reduce the number of cycles to failure by an order of magnitude or more when compared with simple 'saw-tooth' load-unload fatigue cycle. This is known as the dwell debit.