Conclusions
The proposed criteria of similarity of local failure make it possible to compare under similar conditions the behavior of metals and alloys at the moment of occurrence of plastic instability at the apex of a crack (defect). It was established that the critical size of the zone of plastic deformation at a defect (crack) with the exceeding of which under the given loading conditions plastic instability occurs is determined by the ratio of the yield strengths of the given material in shear and in tension and depends upon the mechanism of plastic deformation realized at the moment of occurrence of plastic instability.
With the use of the criteria of similarity of the constriction of plastic deformation it is fundamentally possible to convert the critical parameters controlling the occurrence of plastic instability at the apex of a crack (defect) under various loading conditions.
The results obtained require further analysis and experimental confirmation.
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Translated from Fiziko-Khimicheskaya Mekhanika Materialov, Vol. 13, No. 5, pp. 31–45, September–October, 1977.
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Ivanova, V.S. Determining the fracture toughness of metals and alloys under conditions of similarity of local failure. Mater Sci 13, 491–502 (1978). https://doi.org/10.1007/BF00717547
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DOI: https://doi.org/10.1007/BF00717547