Stress relaxation in sugar beet root under various mechanical load conditions

• Autorzy: Kołodziej Paweł , Stropek Zbigniew , Gołacki Krzysztof

Identyfikatory

DOI

10.12913/22998624/196262

• Języki publikacji: EN

Abstrakty

EN

Identification and determination of the mechanical properties of biological materials, especially fruits, vegetables and industrial plants, can be made using commonly applied stress relaxation tests. They are of particular significance because their results make it possible to propose a mechanical model of studied material. The aim of the study was to determine the effects of initial deformation and deformation velocity on the parameters of generalised Maxwell model during stress relaxation in the sugar beet root. The tests were carried out by means of the texture analyser (model TA.HD plus, Stable Micro Systems, Goldaming, UK) at the three deformations: 2.0, 3.5 and 5.0 mm and the four deformation velocities: 1, 2, 10, and 20 mm·s–1. The cut sugar beet samples used in the experiment were cylindrical in shape, with a 9.5 mm diameter and a 20 mm height. They were initially compressed along the vertical axis in a state of uniaxial stress and constant deformation was maintained while recording the force response for 35 seconds. The two-branched generalised Maxwell model with an additional elastic element was used to describe the experimental force response curves. The sample dimensions as well as the initial deformation velocity were taken into consideration in the model formula. Two relaxation times of the model decreased with the increasing deformation velocity and increased with the increasing deformation value. The dependences of the obtained relaxation times on the phenomena inside the tissue such as the flow of fluids and gases under the load were interpreted. Changes of model parameters as a function of deformation velocity could testify the appearance of internal micro damages in the material during deformation. The tendency of increase in the peak force response along with the increase of deformation velocity shows typical viscoelastic behaviour of sugar beet root flesh.

Słowa kluczowe

EN

sugar beet root; stress relaxation; mechanical properties; Maxwell model; viscoelasticity; generalized maxwell model

• Wydawca: Lublin University of Technology ; Polish Society of Ecological Engineering (PTIE), Branch of PTIE in Lublin
• Czasopismo: Advances in Science and Technology. Research Journal
• Rocznik: 2025
• Tom: Vol. 19, no. 2
• Strony: 296--303
• Opis fizyczny: Bibliogr. 30 poz., fig., tab.

Twórcy

autor

Kołodziej Paweł

• Department of Mechanical Engineering and Automatic Control, University of Life Sciences in Lublin, ul. Głęboka 28, 20-612 Lublin, Poland

• https://orcid.org/0000-0003-0479-1770

autor

Stropek Zbigniew

• Department of Mechanical Engineering and Automatic Control, University of Life Sciences in Lublin, ul. Głęboka 28, 20-612 Lublin, Poland

• https://orcid.org/0000-0002-3293-7063

autor

Gołacki Krzysztof

• Department of Mechanical Engineering and Automatic Control, University of Life Sciences in Lublin, ul. Głęboka 28, 20-612 Lublin, Poland

• https://orcid.org/0000-0003-4751-1572

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