Abstract
To study the mesoscale damage evolution law of irregular sandstone particles, based on RFPA2D and digital image processing technology, a real mesostructure numerical model of irregular sandstone particles is established to simulate the breakage process of particles, the effects of loading conditions and mesoscale heterogeneity on irregular sandstone particle damage are studied, and the calculation method of fractal dimension of irregular rock particles mesoscale fracture is proposed. The results show that the fracture damage degree (ω) and fractal dimension (D) maximum values of the constrained particles are 0.733 and 1.466, respectively, and the unconstrained particles are 0.577 and 1.153, respectively. The final failure mode of constrained particles is more complicated than unconstrained particles, the damage is more serious, and the fracture is more complete. Thus, the larger values of D yield a more complicated final failure mode of the particles. Consequently, with the larger ω, the final damage is more serious, and the breakage effect is comparatively better. The study is of great significance for exploring the laws of rock particle breakage and energy consumption, rock breakage mechanism, and searching for efficient and energy-saving rock-breaking methods.
Highlights
Crushing is the process of turning a large piece of material into a small piece of material under external force, which is widely used in the mineral industry. e crushing operation is the first step to reduce the particle size of the ore or to dissociate useful minerals from the monomer in the ore in the crushing process, which aims to reduce the particle size
The breakage behavior of single particles under without confinement conditions is not the same as that under with confinement conditions; when stress is applied to confinement particles, the stress distribution on the surface will be more complicated. erefore, it is necessary to accurately model the breakage condition of a single particle when studying the breakage behavior of the particles, which will be Advances in Materials Science and Engineering affected by multiple loads from adjacent particles [3]. erefore, in the simulation of particle breakage, the confinement conditions should be considered to better understand the breakage process between particles
The breakage behavior of rock particles is affected by their loading conditions, shape, and size [3]
Summary
Crushing is the process of turning a large piece of material into a small piece of material under external force, which is widely used in the mineral industry. e crushing operation is the first step to reduce the particle size of the ore or to dissociate useful minerals from the monomer in the ore in the crushing process, which aims to reduce the particle size. Tang et al developed the RFPA2D software based on the mesodamage mechanics theory, simulated the breakage process of rock particles under different loading conditions, and verified that RFPA2D is a suitable tool to study particle breakage [5]. The above research results are based on the knowledge gained from the rule test pieces; few attempts have been made to study the breakage process in rock particles by establishing a numerical model based on the real mesostructure of irregular rock particles under different loading conditions. Based on the above problems, this paper uses digital image processing technology to characterize the spatial distribution of minerals in irregular sandstone particles, so as to obtain the real mesostructure of the particles and map it to the finite element mesh, combined with RFPA2D-DIP software to establish a real mesostructure numerical model of irregular sandstone particles. Based on the above problems, this paper uses digital image processing technology to characterize the spatial distribution of minerals in irregular sandstone particles, so as to obtain the real mesostructure of the particles and map it to the finite element mesh, combined with RFPA2D-DIP software to establish a real mesostructure numerical model of irregular sandstone particles. e mesoscale breakage process of sandstone particles under different loading conditions is simulated, the effects of different loading conditions and mesononuniformity on breakage of irregular sandstone particles are studied, and the fractal characteristics, damage evolution, and acoustic emission distribution of breakage process of rock particles in numerical experiments are discussed
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