Experimental and Theoretic Viscoelastic Behavior of Functional Spinal Unit, In Stress Relaxation Test

The objective of the study was to design a simulation model that approximates the real viscoelastic behavior of spinal units in stress relaxation tests. The spinal units were sampled from porcine and used in fresh condition, without frizzing or drying. The mechanical tests were conducted on Mecmesin 5i testing machine using the appropriate devices for compression tests. On the other hand, using Maxwell constitutive equation for relaxation, a Simulink model was created. At the end, the relaxation curve derived from the simulation model was draw next to experimental obtained data in order to represent the fitting.