Structural Scale Levels of Plastic Deformation and Fracture of High-Strength Titanium Alloy Welds

Панин, В. Е.; Panin, S. V.; Pochivalov, Yu. I.; Смирнова, А. С.; Еремин, А. В.

doi:10.1134/s1029959918050107

Cited by 15 publications

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“…The opening or relative shear of the upper and lower planes of the crack during its propagation can occur only according to one of the following three fracture mechanisms (or combination thereof): normal shear, transverse shear, and longitudinal shear [29]. The mechanism of crack nucleation and propagation was investigated in this monograph [30]. In that paper, the following was observed regarding the origin and the propagation of a crack:…”

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confidence: 99%

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Theoretical and Experimental Studies of an Elastic Plate as a Means of Identification of the Energy-efficient Fracturing of the Ore

Кондратец¹,

Matsui²

2018

CSITA

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To investigate an elastic plate as a means of identifying energy-efficient fracturing of the ore, with the objective of providing a basis for developing an efficient ball mill ore-mass-induced overload control device. Research methods. The analysis methods, the methods of the free oscillations theory, the energy balance method, the methods of the rock fracture theory, the methods of physical modeling, the experimental method, the method of measurement and comparison were used. The scientific novelty lies in the fact that for the first time a method for determining the concentration of large ore pieces in a ball mill drum has been theoretically substantiated and experimentally verified by measuring energy consumption for their fracturing. The practical significance of the research conducted is high, as its findings open up the prospect of developing efficient means of measuring the loading and overloading of a ball mill with ore without running the risk of plunging the process unit into an emergency mode. It has been shown that the concentration of coarse solids in a ball mill can be determined by the energy consumption during the process of fracturing the solids, in particular, by the measured deformation of the elastic elements or by the duration of fracturing. The deformation of an elastic element when a certain-mass ball falls down from a constant height depends on the stiffness of the former. In case ore is placed on the elastic element, that element's deformation is conditioned both by its stiffness and the volume of the solids. In the event of the constant stiffness of the elastic element, the deformation difference will depend only on the volume of the ore fractured. The verification of the theoretical points by experimental research has shown the correctness of the former.

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“…It may be argued that the fracture is preceded by the formation of the noncrystallographic structural levels of deformation, along which a shear (macrofragmentation) takes place. Then, a crack propagates along the noncrystallographic boundaries of the distribution of macro-fragments (as a relaxation mechanism of a rotary type) [30].…”

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confidence: 99%