Conclusions
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1.
Nondimensional time at the moment of stress and strain-rate field stabilization is independent of the load applied σo and of the theoretical stress intensity factor, and is determined by the type of stressed condition prevailing.
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2.
In austenitic-class steels such as 18-8, the accumulated damage is localized mainly at an angle 45–50° to notch plane.
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3.
At high applied load levels (σo>0.5σT) shear fracture of specimens takes place without the trunk crack penetrating to a considerable depth, but at low levels (σo>0.4σT) it occurs by growth of the trunk crack.
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4.
The temperature dependence of the\(\dot J_C \)-integral with regard to the moment of crack start is due to the temperature dependence of the creep rate.
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5.
If the small-scale yield is retained, the crack growth rate can be described by the modified stress intensity factor K *cr .
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Additional information
Leningrad. Translated from Problemy Prochnosti, No. 7, pp. 40–45, July, 1983.
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Aminova, I.Y., Petrov, V.A. & Rybin, Y.I. Analytic-experimental determination of kinetic damage and failure at a sharp notch tip in creep conditions. Strength Mater 15, 931–938 (1983). https://doi.org/10.1007/BF01528935
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DOI: https://doi.org/10.1007/BF01528935