Measurement of the cyclic bridging law in a titanium matrix composite and its application to simulating crack growth

摘要

The cyclic bridging traction law for a fiber reinforced titanium matrix composite (TMC) has been measured using a multiple fiber pullout specimen geometry. The test specimens were cut from fati- gued specimens containing a single full bridged matrix crack. The two key parameters obtained from such measurements are the interface sliding stress and the fiber bundle strength. The sliding stress was fond to be considerable lower than the pristine values reported for other TMCs (by a factor of -5), a result of wear of the fiber coatings.