Conclusions
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1.
Alloy AMtsS specimens with a crack fracture under low-cycle loading after three stages of fatigue crack growth: elastic crack growth (rp<0.05 mm); elastic-plastic growth ((r p/lk)<10, δ<0,1 mm); quasistatic growth (r p/lk>10, δ>0.1 mm).
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2.
The fracture of flat-rolled structural elements made of alloy AMtsS with surface cracks is quasistatic under conditions of axial low-cycle loading.
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3.
The nominal net stress equal to the yield strength is a criterion of the transition from elastic-plastic to quasistatic crack growth in alloy AMtsS under low-cycle loading.
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4.
Crack opening equal to the critical crack opening in short-term static strength tests,\(\delta _{c_s } = \delta _{c_c } \), is a criterion of unstable growth of surface cracks in alloy AMtsS under low-cycle loading.
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Literature Cited
A. L. Kaplinskii, “Study of the effect of the scale factor on the low-cycle fatigue of aluminum alloys,” Probl. Prochn., No. 5, 18–20 (1984).
V. A. Strizhalo and A. L. Kaplinskii, “Method of testing flat-rolled specimens of full-scale thickness for low-cycle fatigue,” Probl. Prochn., No. 4, 115–119 (1984).
Additional information
Institute of Strength Problems, Academy of Sciences of the Ukrainian SSR, Kiev. Translated from Problemy Prochnosti, No. 9, pp. 28–31, September, 1984.
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Kaplinskii, A.L. Laws of surface crack growth in alloy AMtsS during low-cycle loading. Strength Mater 16, 1244–1247 (1984). https://doi.org/10.1007/BF01529997
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DOI: https://doi.org/10.1007/BF01529997