The elasticity index (IE), which quantifies the relative
contributions of the elastic and plastic deformations, is
defined as (Ozkan, Xin, & Chen, 2002):
IE ¼
We
Wt
ð7Þ
The elasticity index (IE) is 1.0 for a perfect elastic
material, 0 for a perfect rigid-plastic material, and is
between 0 and 1.0 for an elasto-plastic material. The
determination of IE would be an additional useful parameter
for assessing the texture of the hamburger
samples.
The three parameters (rh¼2mm, S, and IE) obtained
from the analysis of the compression tests would provide
a good assessment of the quality of the hamburger
samples obtained from the two different cooking methods.
The elasticity index characterises the degree of
‘‘elasticity’’ of the cooked meats. If the cooked meat is
very rubbery and chewy, then the value of the IE for the
cooked meat is expected to be high. Both rh¼2mm, and S
can be used to represent the hardness of the cooked