Title
Determining tangential contact force model parameters for viscoelastic materials (apples) using a rheometer Determining tangential contact force model parameters for viscoelastic materials (apples) using a rheometer
Author
Faculty/Department
Faculty of Sciences. Mathematics and Computer Science
Publication type
article
Publication
Subject
Biology
Pharmacology. Therapy
Source (journal)
Postharvest biology and technology: an international journal
Volume/pages
33(2004) :2 , p. 111-125
ISSN
0925-5214
ISI
000222677400002
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
A computer model, based on discrete element method (DEM), can simulate damage to fruit during handling. A contact force model is one of the basic ingredients of a DEM model. A rheometer device was used to measure and validate a tangential contact force model for 'Jonagold' apples. The Mindlin and Deresiewicz model for torsion was used to simulate quasi-static torsion and extended to include a viscous term in order to simulate dynamic torsion. The measured parameters were the dynamic friction coefficient, the shear modulus and the viscosity of the apples. For model validation purposes, the angular deformation, the torque, the contact surface and the normal force were measured as well. The model describes, in a satisfactory way, the phenomenon of slip-stick at the contact surface of the apples. By adding the viscous term, the model was improved. (C) 2004 Elsevier B.V. All rights reserved.
E-info
https://repository.uantwerpen.be/docman/iruaauth/e6d9c8/80d6742.pdf
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