Energy Criterion of In-plane Fracture Propagation in Geomaterials with Rotating Particles

2014 ◽  
pp. 149-154 ◽  
Author(s):  
Arcady Dyskin ◽  
Elena Pasternak
Keyword(s):  
Fracture Propagation ◽  
Energy Criterion

Fracture propagation in brittle granular matter

2007 ◽  
Vol 463 (2087) ◽  
pp. 3021-3035 ◽  
Author(s):  
Itai Einav
Keyword(s):  
Food Industry ◽  
Granular Matter ◽  
Fracture Propagation ◽  
Energy Criterion ◽  
The World ◽  
Energy Theory ◽  
Agriculture And Food ◽  
First Time ◽  
Energy Principles ◽  
Breakage Mechanics

It is nearly a century since Alan Arnold Griffith developed his energy criterion for the fracture propagation of cracks in ‘near-continuous’ solids. Needless to say that his celebrated work has revolutionized the world of material science. In a very succinct way, Griffith connected between three important aspects of the fracture process: (i) the material, (ii) the stress level, and (iii) the geometry of the crack. Nothing similar was developed for brittle granular matter, although in these materials fracture propagates in the sense of comminution. Recently, I have developed an energy theory, called breakage mechanics, based on the concept of breakage. However, the analogy between the mechanics of breakage and fracture is missing. Here I establish this relation using energy principles and derive a critical comminution pressure for brittle granular materials. This critical pressure is surprisingly complementary to Griffith's critical tensile stress for near-continuous materials. This step enables for the first time to apply the principles of fracture mechanics to all disciplines dealing with confined particles comminution such as geophysics, geology, geotechnical engineering, mineral processing, agriculture and food industry, pharmaceutics and powder technology.

Application of the energy criterion for blade processing

2012 ◽  
Vol 6 (2(8)) ◽  
pp. 11-12
Author(s):  
Наталія Сергіївна Преріс
Keyword(s):  
Energy Criterion

Process characteristics of screw impellers with a draught tube for Newtonian liquids. Pumping capacity of the impeller

1981 ◽  
Vol 46 (9) ◽  
pp. 2021-2031 ◽  
Author(s):  
Pavel Seichter
Keyword(s):  
Viscous Liquid ◽  
Energy Criterion ◽  
Velocity Profiles ◽  
Newtonian Liquid ◽  
Creeping Flow ◽  
Geometrical Arrangement ◽  
Draught Tube ◽  
Process Characteristics ◽  
Newtonian Liquids

Velocity profiles and pumping capacity have been determined using a thermistor anemometer in a vessel equipped with a screw impeller. In region of the creeping flow of a Newtonian liquid, i.e. for Re <15, the dimensionless pumping capacity is dependent on the geometrical arrangement of the mixing system. The efficiency was assessed of individual configuration from the value energy criterion expressing the dimensionless power requirements for recirculation of a highly viscous liquid in a vessel equipped with a screw impeller.

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