According to the fracture mechanics theory, the dissipated energy equation of the total new area produced by the fracture is expressed as (22) ... The average crushing energy was selected according to the inference (e.g. Guo et al., 2016) and used in Eq. (23). The theoretical value of the crushing energy density in coal was obtained, …
The crushing energy is analysed based on the first law of thermodynamics. The shear strength of irregular granular materials shows significantly …
According to their theory, the membrane energy should vary with the width, thickness, and angle of the wall. However, most of the research has focused on the theoretical and numerical aspects. ... and the hourglass deformation was well-restrained. During the crushing, the kinetic energy is too small to be considered. It approaches …
The results show that: there is a significant difference between the characteristic stress-characteristic strain states when particles with similar shapes and sizes are crushed, the proposed multi-stage crushing theory accurately explains this complex crushing behavior; The evolution of the input energy, strain energy, and dissipation …
The most acceptable theory is based on the fact that in a size reduction process as the mean particle size decreases, the surface area of the particles increases. ... Comparison between bond crushing energy and fracture energy of rocks in a jaw crusher using numerical simulation. J South Afr Inst Mining Metall, 109 (2009), pp. 709-717. …
Under axial compression, multi-cell tubes are considered more effective than single-cell tubes. Regular hexagonal multi-cell tubes (HMT) were designed, tested, and analyzed by finite element modeling (FEM). The crushing mechanism of the HMT was revealed by compression testing and FEM. Experiments and FEM revealed that the …
It is the purpose of this paper to record and interpret a series of experiments made for the purpose of studying the consumption of …
Finally, theoretical prediction models were developed using simplified super folding element (SSFE) theory to gain deeper insights into crushing behavior and performance of BLS. The present study provided valuable insights into the in-plane crushing and energy absorption capabilities of BLS. Moreover, it highlighted the …
Semantic Scholar extracted view of "A crushing index for granular soils based on comminution energy consumption theory" by Xin Liu et al. Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 220,830,731 papers from all fields of science. Search ...
The power consumption theory of material crushing is the theory about the function conversion law in the material crushing process. That is, the research on the relationship between the energy input to the crushing process and the particle size of the product under a certain feed size condition.
The comminution theory builds a bridge between crushing energy and particle size, making it possible to define a crushing index based on the theory. In the …
ally through milling. In the minerals industry, the goal of blasting is to reduce the in situ rock to a size that is readily transportable, whereas crushing and milling aims to liberate the …
The relationship between coal crushing energy and particle size distribution after crushing conforms to the new surface theory, which states that the energy consumed during coal–rock crushing is proportional to the newly generated surface area (Wen, 1995). Therefore, the coal crushing energy can be calculated by …
In this study, the fractal particle-size-distribution theory was used to calculate the surface areas of coal particles after impact crushing. Combining the …
The energy absorption mechanism is analyzed to calculate the mean crushing force. Theoretical predictions are compared well with the results of three groups of experiments and forty simulation models. Errors between the mean crushing force calculated by theory and experimental results are less than 10%.
The surface energy of coal particles under QSC and DI calculated by the traditional theory, which does not take into account the crack area, is 240.10 J/m 2 and 180.92 J/m 2, respectively, independent of the crushing ratio. The surface energy calculated by the fractal model is 3.55 J/m 2, taking into account the frictional heat.
The crushing energy dissipation mechanism of metal TTRS tubes is presented. ... Axial crushing theory of externally fiber-reinforced thin-walled multiple (twelve) right-angle section tubes. Because fiber-reinforced composite is an anisotropic material whose properties depend on the fiber orientation and stacking sequence, …
The gas content is crucial for evaluating coal and gas outburst potential in underground coal mining. This study focuses on investigating the in-situ coal seam gas content and gas sorption ...
Section snippets Fractal energy consumption model of rock crushing. Fractal geometry was originally developed by Mandelbrot to describe highly irregular and self-similar objects (Mandelbrot, 1982); subsequently, fractal theory was applied to many other scientific fields (Perfect, 1997, Lai and Wang, 2015, Hu et al., 2016).
This research delineates the energy dissipation characteristics in coal crushing under impact loads, leveraging the capabilities of Separated Hopkinson Pressure Bar experimental system. A ...
The crushing response and the energy absorption capacity of a quasi-isotropic C-shaped composite panel is presented to simulate the progressive damage and failure …
Subsequently, a series of numerical studies were conducted to analyze the in-plane dynamic crushing behaviour and energy absorption characteristics at different impact velocities.
The crushing energy of coal plays an important role in mining, gas extraction, occurrence of outburst accidents, and coal pulverisation engineering. To calculate the crushing energy of coal, a fractal model considering the crack area was established. ... The energy distribution theory of comminution specific surface energy, …
The energy consumption in single particle shear crushing was measured and the fractal theory was introduced to analyze the mass distribution of crushed particles. With the help of crushing specific energy consumption, a fractal prediction model of crushing energy consumption was established, and R-R model was used to correct the model.
The crushing energy is composed of the surface energy and frictional heat [10], [11].To simplify the crushing energy, the frictional heat, which is generated by the plastic deformation and intergranular friction, is assumed to be a fixed value per unit surface, which is proposed by Rittinger's law [7], [10].Although Rittinger's law assumes …
The energy consumption model of rock crushing is developed based on fractal and fracture mechanics theory. • A quantitative relationship between the energy …
Energy theory of particle crushing. Xie et al. [31] has thoroughly examined the energy evolution mechanism in rock damage and analyzes energy dissipation and release during rock loading [32], [33]. Subsequently, more scholars have investigated the energy properties of rock damage on this basis [34], [35]. These studies have used rock …
The energy dissipation mechanism of hybrid square tubes wrapped with antisymmetric angle-ply is analyzed. • Membrane force and bending moments are derived considering the effect of stacking sequences of FRP on energy absorption. • The mean crushing force of hybrid square tubes is obtained and validated by experiments and …
The research of crushing theory is mainly summarized as the following three major aspects: the study of strength theory, the research of crushing effect, and the research of crushing power ...
This paper provides an energy consumption model and explains how the operating conditions and structural parameters of a crushing chamber affect energy consumption. Energy consumption is closely related to compressive pressure and displacement. The relationship between pressure, displacement and structural …