Abstract
The fundamentals associated with acoustic emission monitoring of fatigue crack initiation and propagation of Ti-6Al-4V were studied. Acoustic emission can detect and locate incipient fatigue crack extensions of approximately 10 μm. The technique therefore can serve as a sensitive warning to material failure. There are three distinct stages during which acoustic emission is generated. These stages are: crack initiation, slow crack propagation and rapid crack propagation. The distinction between the stages is based primarily on the rate of acoustic emission event accumulation. These three stages of acoustic emission correspond to the three stages of the failure process that occurs during fatigue loading. That is, changes in acoustic emission event rate correspond to changes in crack extension rate. Acoustic emission event intensities are greater during crack initiation than during slow crack propagation and greatest during rapid crack propagation. In a given fatigue cycle, event intensities increase with increasing stress and most high-intensity events occur near or at the maximum stress. Acoustic emission may therefore be used with confidence to detect, monitor and anticipate failure, in real-time.
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References
J. G. Bakuckas andJ. Awerbuch, in “ISTFA Advanced Materials Symposium“ (ASM International, Metals Park, OH, 1987) p. 33.
T. Ohira, T. Kishi andR. Horiuchi, in “Proceedings of the 5th International AE Symposium“ (The Japanese Society for Non-Destructive Inspection, Tokyo, 1980) p. 137.
S. Yuyama, T. Kishi, Y. Hisamatsu andT. Kakimi, in “Progress in Acoustic Emission”, Proceedings of the 6th International AE Symposium, edited by M. Onoe, K. Yamaguchi and T. Kishi (The Japanese Society for Non-Destructive Inspection, Susono, Japan, 1982) p. 126.
G. Chancy, B. Pige andH. Paqueton, in “Titanium, Science and Technology”, Proceedings of the 5th International Conference on Titanium, edited by G. Lutjering, U. Zwicker and W. Bunk (Deutsche Gesellschaft Fur Metallkunde, Oberursel, FRG. 1985) p. 1891.
M. A. Friesel andS. H. Carpenter,Met. Trans. 15A (1984) 1849.
Idem., Mater. Sci. Engng 68 (1984) 107.
J. R. Kennedy,Script Metall. 16 (1982) 525.
H. Tanaka andR. Horiuchi,ibid. 9 (1975) 777.
T. Kishi, H. S. Park, R. Horiuchi, T. Kakimi, M. Nakanose andT. Tanabe, in “Titanium '80 Science and Technology”, Proceedings of the 4th International Conference on Titanium, edited by H. Kimura and O. Izumi (The Metallurgical Society of AIME, Warrendale, PA, 1980) p. 1709.
T. Kishi, T. Ohira andH. Ohyama, in “Titanium Science and Technology”, Proceedings of the 5th International Conference on Titanium, edited by G. Lutjering, U. Zwicker and W. Bunk (Deutsche Gesellschaft Fur Metallkunde, Oberursel, FRG, 1985) p. 2039.
C. E. Hartbower, C. F. Morais, W. G. Reuter andP. P. Crimmins,Engng Fract. Mech. 5 (1973) 765.
O. A. Shinaishin, M. S. Darlow andS. J. Acquaviva,Mater. Eval. 34 (1976) 137.
D. H. Kohn, P. Ducheyne andJ. Awerbuch,J. Mater. Sci. (1992) in press.
ASTM standard F136-84, in “Annual Book of ASTM Standards, Vol 13.01 “Medical Devices“ (ASTM, Philadelphia, 1987) p. 28.
G. Lutjering, A. Gysler andL. Wagner, in “Titanium Science Technology and Applications”, Proceedings of the 6th World Conference on Titanium, edited by P. Lacombe, R. Tricot, and G. Beranger (Les Editions de Physique, Paris, 1989) p. 2.
L. Wagner andG. Lutjering,ibid.in.
D. Broek, “Elementary Engineering Fracture Mechanics”, (Martinus Nijhoff, The Hague, 1984).
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Kohn, D.H., Ducheyne, P. & Awerbuch, J. Acoustic emission during fatigue of Ti-6Al-4V: Incipient fatigue crack detection limits and generalized data analysis methodology. J Mater Sci 27, 3133–3142 (1992). https://doi.org/10.1007/BF01116003
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DOI: https://doi.org/10.1007/BF01116003