Characterization of nonlinear creep behavior of two food products
作者:
Renfu Lu,
V. M. Puri,
期刊:
Journal of Rheology
(AIP Available online 1991)
卷期:
Volume 35,
issue 6
页码: 1209-1233
ISSN:0148-6055
年代: 1991
DOI:10.1122/1.550172
出版商: The Society of Rheology
关键词: Nonlinear viscoelasticity;Nonlinear material property functions;Uniaxial and triaxial tests;Creep;Food products;CREEP;NONLINEAR PROBLEMS;STRESS−STRAIN RELATION;LOADS;APPLES;POTATOES
数据来源: AIP
摘要:
A simplified three‐dimensional viscoelastic equation, based on the Green–Rivlin theory, was used to characterize the nonlinear creep behavior of two food products, i.e., apple and potato. Uniaxial and triaxial creep tests were conducted to evaluate the nonlinear behavior of apple and potato flesh. Four material property functions in the nonlinear constitutive equation were determined using experimental results. The nonlinear constitutive equation was then used to predict the load response of both apple and potato flesh under various loading conditions. The nonlinear constitutive model calculated values compared favorably with the experimental data. Results show that the nonlinearity of apple flesh under the uniaxial creep loading was significant especially for extended loading time periods. The initial load response has a pronounced effect on the nonlinearity of potato flesh under the uniaxial creep loading.
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