Abstract
The article reviews the possibilities, technical peculiarities, and advantages of the new experimental method of determining quantitatively the level of damage to ductile structural materials at the onset of macrofailure. The method is based on the analysis of the change of elastic properties of the ductile material in the zone of macrofailure at supercritical stages of loading (corresponding to the descending branch of the stress-strain diagram). On the example of the aluminum alloy AMtsS and steels St. 3, 08Kh18N10T the article analyzes the kinetics of damage cumulation at the stages of deformation preceding the onset of macrofailure, and the effect of stress raisers on the limit damage to the material at the instant of the onset of macrofailure. The article presents experimental data indicating that the limit damage of the tested materials is constant in the process of the self-similar growth (without change of micromechanisms) of the ductile macrocrack.
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Institute of the Strength of Materials, Academy of Sciences of the Ukrainian SSR, Kiev. Translated from Problemy Prochnosti, No. 9, pp. 14–18, September, 1989.
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Lebedev, A.A., Chausov, N.G. & Evetskii, Y.L. Determination of the damage parameters of ductile materials at the stage of softening. Strength Mater 21, 1137–1141 (1989). https://doi.org/10.1007/BF01529285
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DOI: https://doi.org/10.1007/BF01529285