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MECHANICAL PROPERTIES AND VISCOELASTIC CHARACTERISTICS OF TWO VARIETIES OF YAM TUBERS (DIOSCOREA ALATA) |
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| Authors: | ARMANDO ALVIS MAR VILLAMIEL MAITE RADA-MENDOZA |
| Affiliation: | University of Córdoba vía Cereté, Córdoba, Colombia; Instituto de Fermentaciones Industriales (CSIC) c/ Juan de la Cierva, 3. 28006, Madrid, Spain; Chemistry Department, Investigation Group BICAMSA University of Cauca Popayán, Colombia |
| Abstract: | The main mechanical properties and viscoelastic characteristics of two different cultivars of yam have been measured in this work. Using an Instron machine, some different tests has been applied: puncture, uniaxial compression and bending in order to calculate the parameters: maximum stress of penetration, stress and strain at fracture, deformability modulus and the constants " a " and " b " from the Peleg model. It is concluded that the Pico de Botella cultivar has a fracture stress higher (0.57 MPa) than the Diamante 22 cultivar (0.31 MPa). Also, the degree of deformation at fracture is higher (32 versus 21%). In relation with the constants from the Peleg viscoelasticity model, there are no differences between cultivars, both having the same value of the asintotic stress ( a = 0.43) and very similar for the relaxation stress rates (Pico de Botella, b = 0.03 and Diamante 22, b = 0.02). PRACTICAL APPLICATIONSInformation on mechanical properties of yam that has not been reported in the literature. |
| Keywords: | Mechanical properties viscoelasticity yam |