Issues »  Volume 39, Issue 4

On the Concentration Criterion of Fracture

L. R. Botvina, A. P. Soldatenkov

A.A. Baikov Institute of Metallurgy and Materials Science, RAS, 49 Leninskii Ave., 119334 Moscow, Russia

Received: 13.12.2016; final version - 31.03.2017. Download: PDF

The kinetics of microcracks’ accumulation at various stages of cyclic and static loading of specimens of the low-carbon grade 20, medium-carbon grade 45, and stainless 12Kh18N10T steels is studied. Concentration criterion of fracture ($k$-criterion) characterizing the initiation of process of microcracks’ coalescence and macrocrack formation as well as the characteristics of cumulative microcracks’ distribution over their lengths are estimated. As shown, the $k$-criterion is associated with residual lifetime of a material by means of the power-law dependence. Some general regularities of defect interaction manifesting themselves at fracture of metal specimens are considered.

Key words: concentration criterion of fracture, damage accumulation, tension, microcracks’ density, fatigue, residual lifetime.

URL: http://mfint.imp.kiev.ua/en/abstract/v39/i04/0477.html

DOI: https://doi.org/10.15407/mfint.39.04.0477

PACS: 62.20.mm, 62.20.mt, 75.78.Fg, 81.40.Np, 81.70.Bt, 81.70.Fy, 91.30.Px

Citation: L. R. Botvina and A. P. Soldatenkov, On the Concentration Criterion of Fracture, Metallofiz. Noveishie Tekhnol., 39, No. 4: 477—490 (2017)

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