Tl. Foutz et al., A PROPOSED PHENOMENOLOGICAL MODEL TO CHARACTERIZE MECHANICAL-PROPERTIES OF FLUE-CURED TOBACCO-LEAVES, Transactions of the ASAE, 36(4), 1993, pp. 1203-1207
It was determined that the visco-elastic behavior of four flue-cured t
obacco leaves could be modeled by the equation; sigma(I) = E(I)epsilon
+ C(I)epsilon1+b + sigma(d); where sigma(I) = stress index (N/mm), E(
I) = elastic index coefficient (N/mm), c(I) = non-linear elastic index
parameter (N/mm), b = elastic exponent, mu = damping coefficient depe
ndent on strain rate (N/mm) and d = damping exponent. The relationship
between mu and strain rate was determined to be mu = GAMMAepsilon(bet
a) where GAMMA = viscous constant (Ns(beta)/mm), beta = constant, and
epsilon = strain rate (Lls). In all cases, the coefficient of determin
ation (R2) Was above 95% thereby indicating that this phenomenological
model can be used to describe the non-linear loading curve of these t
obacco leaves. Results indicated the non-linear elastic parameter (c(I
)) influenced the response of the tissue more than the linear elastic
coefficient (E(I)). Viscous behavior was non-linear and resembled the
characteristics of pseudoplastic flow.