Relations between parameters of fracture processes on different scale levels N.V. Mikhailova G. A. Volkov Yu. V. Petrov I. V. Smirnov P.Y. Onawumi Anish Roy Vadim Silberschmidt 2134/36529 https://repository.lboro.ac.uk/articles/journal_contribution/Relations_between_parameters_of_fracture_processes_on_different_scale_levels/9568106 © 2018, Pleiades Publishing, Ltd. Abstract: The processes of ultrasonically-assisted drilling (UAD) and the dynamic tests on split Hopkinson pressure bar (SHPB), fracture in which is implemented at various structural-scale levels, are considered. The simulation of UAD based on the Hertz contact problem and the structural−time criterion is presented. The problem of using the value of the fracture incubation time and its linear size obtained from the tests on SHPB in the simulation is considered. A principle of equal power is used for converting the strength parameters into another structural−scale level. The theoretical curve obtained in the simulation is compared with the results of experiments on conventional drilling (CD) and UAD. 2019-01-10 11:03:44 untagged Mechanical Engineering not elsewhere classified