Abstract
In order to study the deformation displacement and the stress field of brittle rocks under harmonic dynamic loading, a series of systematic numerical simulations are conducted in this paper. A 3D uniaxial compression simulation is carried out to calibrate and determine the property parameters of sandstone and a model of the cylindrical indenter intruding the rock is proposed to analyze the process of elastic deformation. Four main parameters are taken into account, namely the position on the rock, the frequency and the amplitude of dynamic load, the type of indenter and the loading conditions (static and static-dynamic). Based on the analysis undertaken, it can be concluded that both of the deformation displacement and stress field of the rock change in a harmonic manner under the static-dynamic loads. The frequency and the amplitude of harmonic dynamic load determine the period and the magnitude of the rock response, respectively. In addition, the existence of harmonic dynamic load can aggravate the fatigue damage of the rock and allow a reduction in static load. Our investigations confirm that the static-dynamic loads are more conducive to rock fracture than static load.
Highlights
In order to improve the crushing efficiency of hard rocks or some unconventional resources [1], some auxiliary rock-breaking tools, such as axial hydraulic impactor [2], and few emerging rock-breaking methods, such as Resonance Enhanced Drilling (RED) [3,4] and ultrasonic drilling [5,6], have been proposed
The static-dynamic loads have an additional harmonic dynamic load compared to the static load, the average force applied to the indenter is the same under two loading conditions, which means that no extra work is done on the indenter
This paper only focuses on the deformation displacement and the stress field of the brittle rock which is the process before fracture
Summary
In order to improve the crushing efficiency of hard rocks or some unconventional resources [1], some auxiliary rock-breaking tools, such as axial hydraulic impactor [2], and few emerging rock-breaking methods, such as Resonance Enhanced Drilling (RED) [3,4] and ultrasonic drilling [5,6], have been proposed. The interaction between the rock and the indenter has been studied mainly focusing on two aspects: deformation and stress field [13,14,15], and fracture and fragmentation of the rock [16,17,18,19]. Both of them are of great significance to the mechanism research, optimization of operation parameters and process of mechanical tools for rock fragmentation
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