Abstract
A test stand designed for experimental study of the kinetics of fatigue fracture is examined as a nonlinear dynamic system with variable parameters. A analytical model is constructed to describe the loading of a specimen having a fatigue crack and subjected to symmetric cyclic loading. The equation of the loading process is obtained and, for fixed parameter values, expanded into a Fourier series. It is shown that the process of crack growth is characterized by the appearance of a constant component and harmonics that are multiples of the exciting frequency in the output signal. An information parameter is chosen that determines the change in compliance over time during the growth of the fatigue crack in the specimen. Algorithms are developed and instrument configurations found to determine the law governing the change in compliance. An example of the use of the instrument to record crack nucleation and growth is examined.
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Deceased.
Translated from Problemy Prochnosti, No. 2, pp. 110–119, February, 1996.
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Butseroga, V.P. Unit for experimental study of fatigue-crack growth. Strength Mater 28, 158–165 (1996). https://doi.org/10.1007/BF02215843
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DOI: https://doi.org/10.1007/BF02215843