Contact modelling for discrete element modelling of ball mills

Zhang, D.; Whiten, W. J.

doi:10.1016/s0892-6875(98)00055-7

Cited by 8 publications

(2 citation statements)

References 4 publications

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“…In DEM, the forces resulting from a contact between two particles are related to their virtual overlap by a contact force model. The overall contact force can be decomposed into a normal component (perpendicular to the contact surface) and a tangential component (parallel to the contact surface) (Zhang and Whiten , , ; Zhang and Vu‐Quoc 2002a,b; Mao et al . ; Raji and Favier 2004a,b; Van Zeebroeck et al .…”

Section: Introductionmentioning

confidence: 99%

Dynamic Properties of Golden Delicious and Red Delicious Apple under Normal Contact Force Models

Barikloo

Ahmadi

2013

Journal of Texture Studies

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Dynamic forces cause the most bruise damage during fruit transport and handling. In order to reduce this damage, it is necessary to model the impact forces. Limited information is available in the literature about the behavior dynamic and dynamic modeling for apple. The normal force‐displacement relationship between a viscoelastic sphere (fruit apple) and an impactor was analyzed using the Kuwabara and Kond and Tsuji models as normal force models. Fruits were subjected to dynamic loading by means of a pendulum at impact levels. In order to estimate the parameters (spring, “k” and damping, “c”) of the mentioned models for normal impacts, the nonlinear least squares technique (optimization method) was used. Practical Applications A very promising approach for the simulation of fruit impact damage during transport and handling is the contact force discrete element method (DEM). In order to do so, models for the forces acting between particles (like fruits) in contact need to be specified. Forces acting between the two particles are decomposed into normal and tangential components. In this paper, the focus is set on normal contacts. The presented research determines the parameters of normal contact forces models suited for DEM simulation of viscoelastic materials (fruit).

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Section: Introductionmentioning

confidence: 99%

Dynamic Properties of Golden Delicious and Red Delicious Apple under Normal Contact Force Models

Barikloo

Ahmadi

2013

Journal of Texture Studies

View full text Add to dashboard Cite

show abstract

“…In the DEM, the forces resulting from a contact between two particles are related to their virtual overlap by a contact force model. The overall contact force can be decomposed into a normal component (perpendicular to the contact surface) and a tangential component (parallel to the contact surface) (Zhang and Whiten 1996, 1998, 1999; Zhang and Vu Quoc 2002a,b; Mao et al . 2004; Raji and Favier 2004a,b; Van Zeebroeck et al .…”

Section: Introductionmentioning

confidence: 99%

Dynamic Modeling of Peach Fruit During Normal Impact

Ahmadi

Ghassemzadeh

Sadeghi

et al. 2011

J Food Process Engineering

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Impact forces during the contact are the main sources of damage in Peach fruit. In order to reduce this damage, it is necessary to model the impact forces during handling and transporting. An experimental procedure was conducted to determine the parameters of a viscoelastic normal contact force model. Peaches were subjected to dynamic loading by means of a pendulum at the levels of impact. In order to estimate the values of the parameters (spring, "k" and damping, "c") of the Kuwabara and Kono viscoelastic contact force models for normal impacts the nonlinear least squares technique to be calculated. Two prediction models were constructed for the parameters "k" and "c" using multiple linear regression analyses. In these models, impact velocity and two fruit properties (the effective radius of curvature and acoustic stiffness) were used as independent variables. Significant effect of impact velocity, the effective radius of curvature and acoustic stiffness and some interactions on the parameters "k" and "c" were obtained at 5% probability level with the 6 Corresponding 483 coefficient of determination of 0.99 for models. It was concluded that lowering the impact velocity and increasing the effective radius of curvature and acoustic stiffness will enhance the parameters "k" and "c" of the peach fruit, but there was no significant effect of the acoustic stiffness on the damping parameter. PRACTICAL APPLICATIONSA very promising approach for the simulation of fruit impact damage during transport and handling is the contact force discrete element method (DEM). In order to do so, models for the forces acting between particles (like fruits) in contact need to be specified. Forces acting between the two particles are decomposed into normal and tangential components. In this paper the focus is set on normal contacts. The presented research determines the parameters of normal contact forces models suited for DEM simulation of viscoelastic materials (peach fruit). 484E. AHMADI ET AL.The most frequently employed models in discrete element simulations are the linear models. In order to include energy dissipation, their normal force always consists of two parts, one for modeling the elastic repulsion, the other DYNAMIC MODELING OF PEACH FRUIT 485 DYNAMIC MODELING OF PEACH FRUIT 487

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Optimizing the design of rockfall embankments with a discrete element method

Plassiard

Donzé

2010

Engineering Structures

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Contact modelling for discrete element modelling of ball mills

Cited by 8 publications

References 4 publications

Dynamic Properties of Golden Delicious and Red Delicious Apple under Normal Contact Force Models

Dynamic Properties of Golden Delicious and Red Delicious Apple under Normal Contact Force Models

Dynamic Modeling of Peach Fruit During Normal Impact

Optimizing the design of rockfall embankments with a discrete element method

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