Conclusions
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1.
The low-frequency components of the field of internal stresses have the determining action on crack propagation as the result of the longer damping of them and the high amplitude of the oscillations.
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2.
The source of the low-frequency components of the field of internal stresses is the external loads, in the absence of which crack propagation is impossible.
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3.
Significant bending of the crack growth trajectory in failure of a rod by three-point bending is caused by more rapid damping of the external load applied to the short end of the rod in comparison with the total time of crack propagation and with the time of relaxation of the external load applied to the long end.
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Literature Cited
E. N. Vysotskii and V. V. Grishaev, “An experimental investigation of the stressed condition of a specimen with an edge crack in bending”, Probl. Prochn., No. 6, 37–40 (1987).
E. Skuchik, Fundamentals of Acoustics [Russian translation], Vol. 1, Mir, Moscow (1976).
G. S. Pisarenko, V. A. Agarev, A. L. Kvitka, et al., The Resistance of Materials [in Russian], Tekhnika, Kiev (1967).
S. P. Timoshenko and J. Goodier, The Theory of Elasticity, [in Russian], Nauka, Moscow (1979).
Additional information
Donetsk Physicotechnical Institute. Translated from Problemy Prochnosti, No. 2, pp. 25–28, February, 1988.
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Vysotskii, E.N., Grishaev, V.V. Evaluation of the damping of stresses in a specimen with an edge crack being failed by bending. Strength Mater 20, 164–167 (1988). https://doi.org/10.1007/BF01522916
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DOI: https://doi.org/10.1007/BF01522916