A strain sweep test was performed on the natural fiber composites in order to establish the linear viscoelastic regime and to characterize
the strain dependent viscoelastic properties of the
samples, 0.002 was a chosen strain from this linear regime. After
which a dynamic frequency sweep tests were performed using this
strain amplitude of 0.002. The complex torsional modulus (G⁄) calculated
using Eq. (2) below can be assimilated to the torsion modulus
[26]: