|
|
vol. 5, nr. 3 (2005)
|
Effect of deformation rate on selected characteristics of viscoelastic plant materials
|
|
|
Krzysztof Gołacki, Anna Stankiewicz, Zbigniew Stropek
|
|
| (get PDF )
|
|
|
Department of Machine Theory and Automatics, University of Agriculture, ul. Doświadczalna 50 A, 20-280 Lublin |
|
|
vol. 5 (2005), nr. 3,
pp. 645-655
|
|
|
abstract:
The paper reports the results of a study on the influence of the deformation rate on the mechanical parameters of biological viscoelastic materials. It is proved, based on the Maxwell model, that the modulus of elasticity and the viscosity ratio are decreasing functions of the rate of deformation. Next the modulus of elasticity and the viscosity ratio of the apple and potato cylindrical samples are determined using discrete-time measurements of the reaction force obtained in compression and relaxation tests for six different values of the deformation rate. The stress relaxation both in the state of uniaxial stress as well as in the state of uniaxial strain is considered. The experimental results are in good agreement with theoretical analysis for both the biological materials considered.
|
|
keywords:
potato, apple, viscoelasticity, stress relaxation, Maxwell model, deformation rate
|
|
original in:
Polish
|
|
|
|
|
|
