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Table 3 Mechanical properties of disc

From: System reliability analysis of the scoliosis disorder

The Material Constants of Annulus Matrix and Nucleus Pulposus Using the Prony Series
Relaxation ofShear Relaxation Modulus (MPa.)Bulk Relaxation Modulus (MPa.)Relaxation Time Constant (second)
Annulus matrix, E = 8.0 (MPa.), ν = 0.45g1 = 0.399k1 = 0.399τ1 = 3.45
g2 = 0.000k2 = 0.300τ2 = 100
g3 = 0.361k3 = 0.149τ3 = 1000
g4 = 0.108k4 = 0.150τ4 = 5000
Nucleus pulposus, E = 2.0 (MPa.), ν = 0.49g1 = 0.638k1 = 0.0τ1 = 0.141
g2 = 0.156k2 = 0.0τ2 = 2.21
g3 = 0.120k3 = 0. 0τ3 = 39.9
g4 = 0.0383k4 = 0.0τ4 = 266
g5 = 0k4 = 0.0τ4 = 500