On modeling the large strain fracture behaviour of soft viscous foods

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Title: On modeling the large strain fracture behaviour of soft viscous foods
Authors: Skamniotis, CG
Elliott, M
Charalambides, MN
Item Type: Conference Paper
Abstract: Mastication is responsible for food breakdown with the aid of saliva in order to form a cohesive viscous mass, known as the bolus. This influences the rate at which the ingested food nutrients are later absorbed into the body, which needs to be controlled to aid in epidemic health problems such as obesity, diabetes, and dyspepsia. The aim of our work is to understand and improve food oral breakdown efficiency in both human and pet foods through developing multi-scale models of oral and gastric processing. The latter has been a challenging task and the available technology may be still immature, as foods usually exhibit a complex viscous, compliant, and tough mechanical behaviour. These are all addressed here through establishing a novel material model calibrated through experiments on starch-based food. It includes a new criterion for the onset of material stiffness degradation, a law for the evolution of degradation governed by the true material’s fracture toughness, and a constitutive stress-strain response, all three being a function of the stress state, i.e., compression, shear, and tension. The material model is used in a finite element analysis which reproduces accurately the food separation patterns under a large strain indentation test, which resembles the boundary conditions applied in chewing. The results lend weight to the new methodology as a powerful tool in understanding how different food structures breakdown and in optimising these structures via parametric analyses to satisfy specific chewing and digestion attributes.
Issue Date: 29-Nov-2017
Date of Acceptance: 19-Oct-2017
ISSN: 1070-6631
Publisher: AIP Publishing
Journal / Book Title: Physics of Fluids
Volume: 29
Issue: 12
Copyright Statement: © 2017 The Author(s). Published by AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Physics of Fluids and may be found at
Sponsor/Funder: Mars Care and Treats
Funder's Grant Number: 2003625024
Conference Name: Meeting of the Institute-of-Non-Newtonian-Fluid-Mechanics (INNFM)
Keywords: Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
01 Mathematical Sciences
02 Physical Sciences
09 Engineering
Fluids & Plasmas
Publication Status: Published
Start Date: 2017-04-10
Finish Date: 2017-04-12
Conference Place: Llanwddyn, WALES
Appears in Collections:Faculty of Engineering
Mechanical Engineering

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