Anisotropic Relaxation Properties of Pear

The relaxation phenomena are the critical aspect of fruit rheological properties. Little detailed information is available on the nonhomophonous and anisotropic relaxation properties of fruits. The objective of this study is to determine the effects of specimen orientation and location with the pear on the equilibrium modulus, the decay modulus, relaxation time and specific viscosity in the relaxation model. The stress relaxation tests were performed on Dangshan pear using the Instron universal testing machine. The decay modulus, the equilibrium modulus, relaxation time and specific viscosity in the relaxation model are significantly influenced by specimen orientation, latitude, depth. The longitude of specimen and initial deformation are not significant.