Calculation Model of Growth of a Fatigue Macrocrack in Case of the Ⅰ + Ⅲ Mixed-Mode Macromechanism of Fracture

Issues » Volume 38, Issue 3

D. V. Rudavskyy$^{1}$, Yu. I. Kanyuk$^{1}$, V. R. Bas$^{2}$

$^{1}$Karpenko Physico-Mechanical Institute, NAS of Ukraine, 5, Naukova Str., 79060 Lviv, Ukraine
$^{2}$JSC ‘Lvivskyy Lokomotyvoremontnyy Zavod’, 1a Zaliznychna Str., 79018 Lviv, Ukraine

Received: 11.06.2015; final version - 17.02.2016. Download: PDF

Based on energy approach in the mechanics of fracture, the calculation model of fatigue macrocrack propagation in three-dimensional elastoplastic body is constructed for the case of Ⅰ + Ⅲ mixed-mode of fracture macromechanism. Subcritical period of fatigue macrocrack growth, which corresponds to residual lifetime of metalware element with a crack under external cyclic loading, can be determined using the obtained kinetic equation. The kinetic equation of the model contains only two experimental constants of the material, which are determined from tests on cyclic fatigue. The proposed calculation model can be used for development of techniques of residual lifetime estimation of metallic structural elements with fatigue cracks grown according to Ⅰ + Ⅲ mixed-mode of fracture macromechanism.

Key words: fatigue cracks, residual lifetime, mixed-mode of fatigue fracture, plastic zone, fracture energy.

URL: http://mfint.imp.kiev.ua/en/abstract/v38/i03/0415.html

DOI: https://doi.org/10.15407/mfint.38.03.0415

PACS: 05.70.Ln, 46.35.+z, 46.50.+a, 46.80.+j, 62.20.M-, 81.40.Np, 83.60.Uv

Citation: D. V. Rudavskyy, Yu. I. Kanyuk, and V. R. Bas, Calculation Model of Growth of a Fatigue Macrocrack in Case of the Ⅰ + Ⅲ Mixed-Mode Macromechanism of Fracture, Metallofiz. Noveishie Tekhnol., 38, No. 3: 415—425 (2016) (in Ukrainian)

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