Abstract
This work presents a study of contact stress phenomena in spherical fruits which generates non-linear relations for force and deformation. The material viscoelastic behavior is then associated with the non-linear relations due to the geometry of the body, generating a non linear viscoelastic problem. Such a nonlinearity is called geometric non linearity. Elastic-Viscoelastic correspondence principle can not support the present case due the changes in boundary conditions. A technique was developed to measure the contact area and by means of the Hertz Contact Stress Theory, a function γ(t) was defined, which is strongly influenced by force and deformation rates.
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