SEDL / STP / STP1157-EB / STP15354S

Acoustic Emission Monitoring of Fatigue in Titanium Aluminide XD Composite

Lee, EU
Materials engineer, mechanical engineer, and physicist, Naval Air Warfare Center, Warminster, PA

Granata, DM
Materials engineer, mechanical engineer, and physicist, Naval Air Warfare Center, Warminster, PA

Scott, WR
Materials engineer, mechanical engineer, and physicist, Naval Air Warfare Center, Warminster, PA

Pages: 19    Published: Jan 1992

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Abstract

The feasibility of acoustic emission (AE) monitoring of fatigue crack growth in titanium aluminide XD composites was investigated. Under tension-tension and compression-compression loading, the total accumulated number of AE events corresponds closely to the fatigue crack growth. The majority of the AE occurs near the maximum load during uploading. In the tension fatigue test, the AE is controlled by the stress intensity factor, and its relationship is given by the equations An=(1.1×10−3)·(Kmax)6.3 An=(1.1×10−3)·(ΔK)6.3 where An is the total number of AE events, K^max the maximum stress intensity factor, and ΔK the range of stress intensity factor.