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Journal of Applied Mechanics and Technical Physics

2018 year, number 1

Relationship between the Crack Velocity, Fractal Dimension, and Dynamic Fracture Toughness of a Material

A. M. Bragov1, A. Yu. Konstantinov1, A. V. Kuznetsov2, A. K. Lomunov1, G. G. Savenkov2,3
1Lobachevsky State University of Nizhni Novgorod, Nizhni Novgorod, 603950, Russia
2Armalit Machine-building factory, St. Petersburg, 198097, Russia
3St. Petersburg State Technological Institute, St. Petersburg, 190013, Russia
Keywords: скорость трещины, фрактальная размерность, динамическая трещиностойкость, crack velocity, fractal dimension, dynamic fracture toughness


This paper presents the results of experimental studies of the crack propagation velocity and dynamic fracture toughness of St. 45 steel and D16T duralumin using a modified Kolsky method on a split Hopkinson bar. The results of microfractografic analysis of samples are given, and the fractal dimension is determined. The critical stress intensity factors are determine using the obtained fractal dimension values.