Acoustic-emission diagnostics of the initiation of fatigue fracture of 1201-T aluminum alloy
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We consider the specific features of generation of acoustic emission caused by the fatigue fracture of thermally strengthened 1201-T aluminum alloy. Based on the metallographic and fractographic investigations and analysis of typical signals, we establish that this alloy is destroyed by the brittle-ductile mechanism. The character of acoustic-emission radiation depends on the alloy microstructure and mechanical properties, and the area of the formed defect is proportional to the sum of amplitudes of the recorded signals. The passage from the initiation of a fatigue crack to its stable propagation is accompanied by a sharp jump of the acoustic-emission activity.
Keywordsaluminum alloy acoustic emission microstructure microfractogram wavelet transform
- 1.V. R. Skal’s’kyi and P. M. Koval’, Acoustic Emission in the Course of Fracture of Materials, Articles, and Structures [in Ukrainian], SPOLOM, Lviv (2005).Google Scholar
- 6.M. Huang, L. Jiang, P. K. Liaw, et al., “Using acoustic emission in fatigue and fracture materials research,” JOM J. Minerals, Metals Mater. Soc., 50, No. 11, 1–12 (1998).Google Scholar
- 9.C. B. Scruby, G. R. Baldwin, and K. A. Stacey, “Characterization of fatigue crack extension by quantitative acoustic emission,” Int. J. Fract., 28, No. 4, 201–222 (1985).Google Scholar
- 11.Methodical Instructions. Strength Analysis and Tests in Machine Building. Methods of the Mechanical Tests of Metals. Determination of the Characteristics of Resistance to Crack Propagation (Crack Resistance) under Cyclic Loading [in Russian], Gos. Komitet Standartov SSSR, L’vov (1979).Google Scholar
- 12.M. S. Miller and J. P. Gallagher, “An analysis of several fatigue crack growth rate description,” in: Fatigue Crack Growth Measurement and Data Analysis, Am. Soc. Test. Mater. (1981), pp. 205–251.Google Scholar
- 14.V. V. Panasyuk (editor), Fracture Mechanics and Strength of Materials: Handbook [in Russian], Vol. 4: O. N. Romaniv, S. Ya. Yarema, G. N. Nikiforchin, et al., Fatigue and Cyclic Crack Resistance of Structural Materials, Naukova Dumka, Kiev (1990).Google Scholar
- 15.W. W. Gerberich, D. G. Alteridge, and J. E. Lessar, “Acoustic-emission investigation of microscopic ductile fracture,” Met. Trans., A6, No. 2, 797–801 (1975).Google Scholar
- 18.V. R. Skal’skii, S. I. Builo, and E. M. Stankevich, “A criterion for the estimation of glass brittle fracture by acoustic-emission signals,” Defektoskopiya, No. 5, 26–34 (2012).Google Scholar
- 19.V. R. Skal’s’kyi, L. R. Botvina, and O. M. Stankevych, “Diagnostics of the fracture mechanisms of 38KhN3MFA steel by the wavelet transform of acoustic-emission signals,” Tekhn. Diagn. Nerazrush. Kontrol’, No. 3, 12–17 (2011).Google Scholar
- 20.Vallen Systeme: The Acoustic Emission Company [Virtual Resource], http://www.vallen.de.