The effect of compressibility, loading position and probe shape on the rupture probability of tomato fruits

Li, Zhiguo

doi:10.1016/j.jfoodeng.2013.06.024

Cited by 24 publications

(15 citation statements)

References 20 publications

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“…Mechanical damage to fruit, manifested at the macro scale, is caused ultimately by failure of cells at the micro scale (Li & Thomas, 2015b). Investigation of the viscoelastic-plastic behavior of single cells is necessary to macro-scale modelling, simulation and prediction of mechanical damage to fruits (Li, 2013).…”

Section: Introductionmentioning

confidence: 99%

Viscoelastic-plastic behavior of single tomato mesocarp cells in high speed compression-holding tests

Zhang

Thomas

2016

Innovative Food Science & Emerging Technologies

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The micromechanics of isolated tomato fruit cells were investigated by microcompression-holding. Covering the cells with deionized water after isolation caused no significant volume changes, suggesting that cells suspended in water for compression testing were representative of those in the original tissue. The viscoelastic-plastic behavior of such cells was characterized by compression at 4900 ± 200 μm s-1 , then holding. Although the cells were generally not spherical initially and some cell deformation appeared to be local, the force-time data were fitted by the Hertz-Maxwell model for relaxation of viscoelastic spheres. The force at 15% deformation, instantaneous and equilibrium elastic moduli, yield strength, and first and second relaxation times were 2.5 ± 0.6 mN, 0.6 ± 0.3 MPa, 0.22 ± 0.08 MPa, 0.03 ± 0.01 MPa, 0.48 ± 0.05 s, 0.033 ± 0.004 s, respectively. These parameters showed little sensitivity to several reasonable definitions of cell size nor to changes in the (assumed) Poisson's ratio. Industrial Relevance: Fresh fruit is very susceptible to damage during industrial handling (e.g. mechanical harvesting, packaging and transport). Mechanical damage to fruit, manifested at the macro scale, is caused ultimately by failure of cells at the micro scale. Viscoelastic-plastic characterization of single cells isolated from tissue is vital to macro-scale modelling, simulation and prediction of mechanical damage to fruits. The method might be extended to single cells of other fruits.

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Section: Introductionmentioning

confidence: 99%

Viscoelastic-plastic behavior of single tomato mesocarp cells in high speed compression-holding tests

Zhang

Thomas

2016

Innovative Food Science & Emerging Technologies

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“…Above the critical strain value, continuously increasing external forces will cause plastic deformation of the fruit materials; with further increasing external forces, failure such as cell burst (Blewett and others ), tissue/cuticle breakage (Bargel and Neinhuis ; Li and others ), and/or fruit rupture will occur (Matas and others ; Li ). There has not been much investigation of the plastic/failure mechanics of fruit materials.…”

Section: Rheological Characteristics Of Fruit Materialsmentioning

confidence: 99%

“…The physical properties of fruit, which are regarded as a part of contact mechanics in food engineering (Barbosa-Canovas and others 2006), are an important consideration in the design of postharvest mechanical handling facilities. The physical and mechanical properties of fruits are main determinants of intelligent harvesting strategies (Li andothers 2011, 2013b), the size, material, power, and mechanical structure of grippers (Baeten and others 2008;Font and others 2014), and the design of separation devices and conveyor chains in fruit harvesting machines (Caprara and Pezzi 2011;Li and others 2012;Gonzalez-Montellano and others 2014). They are also necessary in the design of hoppers and sponge-drying sheets in washing machines (Ai-Katary and others 2010), the gap between adjacent rotary brushes in waxing machines (Zeng 2012), the structure and power of grading screws and separator devices, the material and structure of cushioning and shock absorbing devices (Brown and others 1990;Guyer and others 1991), and the control mode and geometric size of conveyor devices in sorting and packaging lines (Pla and others 2001;Zhao and Li 2009).…”

Section: Design Of Mechanical Handling Equipmentmentioning

confidence: 99%

“…The mechanical simulation of fruits with a multiscale geometrical model linking the macroscopic (whole fruit) scale through the mesoscopic (tissue) scale to the microscopic (cellular) scale (Fratzl 2003;Aizenberg and others 2005) would be scientifically and commercially valuable in understanding how external mechanical damage to fruit causes internal cellular damage and other changes that lead to bruising. There are some kinds of fruits such as apple (Dintwa and others 2008), watermelon (Sadrnia and others 2008), and tomato (Li andothers 2013a, 2017) for which multitissue geometrical models have been developed to simulate the complex impact and compression mechanical behavior. More realistic fruit models would be more accurate in simulations using finite element analysis, but they would take a long time to compute, maybe even unachievable within the limits of existing computing power (Li and others 2015).…”

Section: Prediction Of Mechanical Damagementioning

confidence: 99%

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Mechanical Models of Compression and Impact on Fresh Fruits

Miao

Andrews

2017

Comp Rev Food Sci Food Safe

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Well-designed and well-operated postharvest mechanical handling processes are vital if fresh fruits are to enter markets with minimal damage. The susceptibility of fruit to quality loss during handling is largely determined by mechanical contact and damage. This article reviews current understanding concerning the effect of impact and other mechanical contacts on fruits. It also discusses the major mechanical models that represent the interaction between fruits or a fruit and a surface. In total, 25 mechanical models associated with compression and impact behaviors of fresh fruits, mainly characterizing such behavior between 2 deformable spherical bodies and between a deformable spherical body and a rigid plate are reviewed. Finally, possible future research directions are discussed. The main challenge in fruit handling is to recognize and prevent microscopic damage to fruits, especially internal tissue/cell damage and microcracks resulting from multiple/repetitive impacts and compressions.

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“…Mechanical damage in fruits and vegetables is the rupture of the cellular structure caused by mechanical interactions such as impact, cutting, abrasion, and compression. Many studies found in the literature (Li, 2013;Tezotto et al, 2011;Sousa et al, 2017;Komarnicki et al, 2016;Stropek & Golacki, 2013;Fadiji et al, 2016) carried out analyses in the laboratory and related the physiological behavior observed with the applied force or tension as the final objective.…”

Section: Introductionmentioning

confidence: 99%

Deformation of Peaches Submitted to Cyclic Loading Using the Discrete Element Method

Pinto

Ferraz

2018

Eng. Agríc.

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This study aimed to use and validate a simple contact force model that describes the behavior of peaches stored in a wooden box, loaded cyclically, by using the discrete element method. The Kelvin-Voigt contact force model was used and the cyclic loading in the simulation was performed with an amplitude of 1 mm and frequency of 12 Hz for time intervals of 3600, 5400, and 7200 s. The laboratory test was performed with a peach box attached to a vibrating table by applying the same excitation conditions used in the simulation. For validation, model results were compared with those from the laboratory test by using deformation values of fruits in the contact regions. To measure this deformation, we adapted the methodology for determining the radius of curvature. The Kelvin-Voigt linear contact model, despite its simplicity in representing the viscoelastic behavior, adequately estimated the final deformation in peaches submitted to cyclic loading.

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The effect of compressibility, loading position and probe shape on the rupture probability of tomato fruits

Cited by 24 publications

References 20 publications

Viscoelastic-plastic behavior of single tomato mesocarp cells in high speed compression-holding tests

Viscoelastic-plastic behavior of single tomato mesocarp cells in high speed compression-holding tests

Mechanical Models of Compression and Impact on Fresh Fruits

Deformation of Peaches Submitted to Cyclic Loading Using the Discrete Element Method

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