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MECHANICAL PROPERTIES AND VISCOELASTIC CHARACTERISTICS OF TWO VARIETIES OF YAM TUBERS (DIOSCOREA ALATA)
Author(s) -
ALVIS ARMANDO,
VILLAMIEL MAR,
RADAMENDOZA MAITE
Publication year - 2010
Publication title -
journal of texture studies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.593
H-Index - 54
eISSN - 1745-4603
pISSN - 0022-4901
DOI - 10.1111/j.1745-4603.2009.00215.x
Subject(s) - viscoelasticity , cultivar , materials science , composite material , stress relaxation , fracture (geology) , modulus , compression (physics) , bending , flexural strength , horticulture , biology , creep
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 APPLICATIONS Information on mechanical properties of yam that has not been reported in the literature.