Three dimensional location and quantitative evaluation of cracking size in Ti alloy by acoustic emission source characterization
Attempts were made to characterize the microcrack nucleation processes in Ti-6Al-4V alloy specimens using acoustic emission (AE) data as a probe. Notched one-inch thick compact specimens were subjected to tensile forces to failure. Piezoelectric transducers were attached in three planes of the specimens to monitor the fracture mode, size and mean velocity of the microcracks and locate them in three dimensions. A source function was defined in terms of a displacement tensor to evaluate the AE data obtained. The results support a model of the nucleation of 200-300 microns diameter quasi-cleavage microcracks at a pre-fatigue crack tip along the crack front. Crack growth then proceeds along the path which features the most coalescence of microcracks in the thickness of the material.
- Research Organization:
- Tokyo Univ., Japan; Kobe Steel, Ltd., Japan
- OSTI ID:
- 5633645
- Report Number(s):
- CONF-8510159-
- Journal Information:
- J. Acoust. Emiss.; (United States), Vol. 4; Conference: 2. international conference on acoustic emission, Lake Tahoe, NV, USA, 28 Oct 1985
- Country of Publication:
- United States
- Language:
- English
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