American Society of Agricultural and Biological Engineers

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Time-Dependent Aspects of the Strength and Rheology of Vegetative Tissue

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Transactions of the ASAE. 26 (4): 1275-1280. (doi: 10.13031/2013.34116) @1983
Authors:   R. E. Pitt, H. L. Chen

ABSTRACT THIS paper presents a mathematical model for the cellular structure of vegetative tissue, taking into account the viscoelastic properties of the individual cells. The model is used to develop qualitative predictions for the effect of cell turgidity and rate of loading on tissue stiffness, stress at failure, and strain at failure. For a single cell, the model indicates that yielding can occur due either to cell wall failure or cell relaxation from the migration of cell fluids out of the cell. A review of previous experiments and new data presented in this paper indicate that the model gives a good representation of the time-dependent behavior of apple tissue in compression. Strain at failure is significantly lower at high strain rates and/or with more turgid samples. Stress at failure may or may not be affected by turgidity and rate of loading. Tissue stiffness is increased by increased cell turgidity and rate of loading.

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