Coarse particle fracture with the ultrafast load cell

Tuzcu, E. Tuğcan; Dhawan, Nikhil; Rajamani, Raj K.

doi:10.1007/bf03402449

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…This would not invalidate the proposed methods in this study or alter the physical meaning of f Mat and xE m,min as material parameters, but it may prevent f Mat and xE m,min being used interchangeably between single particle impact experiments and DEM simulations. Further fundamental work needs to be carried out using a combined approach of DEM simulations and single particle or particle bed impact tests to determine the accuracy of impact energy distributions as well as the use of ultrafast load cells to determine fracture energies more accurately.…”

Section: Resultsmentioning

confidence: 99%

Formulation of a physically motivated specific breakage rate parameter for ball milling via the discrete element method

2014

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A physically based specific breakage rate parameter of the population balance model for batch dry‐milling is formulated, which explicitly accounts for the impact energy distribution calculated by the discrete element method (DEM). Preliminary DEM simulations of particle impact tests were first performed, which concluded that dissipation energy should be used in contrast to collision energy to accurately define the impact energy distribution. Subsequently, DEM simulations of the motion of spheres representing silica glass beads in a ball mill were performed to determine the specific breakage rate parameter, which was in good agreement with those found experimentally. An analysis of the impact energy distribution, which was only possible within context of the physically motivated specific breakage rate parameter, emphasized the importance of accounting for a threshold impact energy. Without proper assessment of the impact energy distribution, DEM simulations may lead to an erroneous evaluation of milling experiments. © 2014 American Institute of Chemical Engineers AIChE J, 60: 2404–2415, 2014

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Section: Resultsmentioning

confidence: 99%

Formulation of a physically motivated specific breakage rate parameter for ball milling via the discrete element method

2014

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“…The force acting on a single particle caught between the ball and the rod can be computed from the measured signal. Details of the UFLC equipment and experimental measurement of the force and fracture energies are given elsewhere [10]. Hertz [11] was the first to view the contact of two bodies as an equivalent problem in electrostatics and suggests a theory of local indentations.…”

Section: Uflc Theorymentioning

confidence: 99%

Particle Internal Fracture Energy Measurement by Ultrafast Load Cell

Tuzcu¹

2016

SDÜ Fen Bil Enst Der

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Ultrafast Load Cell (UFLC) device is used in micro-scale modeling of particle fracture. Electro-mechanical device measures the internal fracture energy of the particles during the fracture event under impact. The sphere and/or cylinder weight is dropped onto particle staying on a plane cylinder surface. The point where the particle is divided into two pieces without secondary, tertiary breakages is called the fracture point. UFLC is equipped with two Wheatstone bridges. These bridges convert compressive strain signals produced during the impact event to a voltage signal. This signal can be expressed as force, energy, and displacement. All the information gained during the fracture is then used to estimate breakage rates of the particles. In this study, two parameter Weibull distribution is used in modeling the internal fracture energy distributions of the particles those ranges between 7mm and 45mm. It is concluded from the study that the median internal specific fracture energy of the particles of the size 45mm and 7mm are 2.2 Joule /kg and 24.4 Joule /kg, respectively. This study quantitatively shows the relationship between the particle specific fracture energy and the size.

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“…A different version of a drop-weight tester known as ultrafast load cell or more recently known as the impact load cell has been used to understand the fracture and deformation characteristics of particles under impact loading [9][10][11]. Ultra-fast load cells can measure the particle fracture energy, strength and stiffness.…”

Section: Introductionmentioning

confidence: 99%