Fig. 6.

The predicted vertical displacements, fluid pressure, vertical nominal strain, and Tresca stress as a function of cartilage depth and time for Tests C and D (distributed fiber models). All parameters were taken at R = 0, where R is the referential radial coordinate. a Vertical displacement. b Fluid pressure. c Vertical nominal strain. d Tresca stress. Left column Test C. Right column Test D. The time histories of the vertical displacement at ten different depths (ξ = Z/h equal to 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0) are plotted. ξ is the normalized depth with ξ = 0 and 1.0 referring to the bone–cartilage interface and contact surface, respectively. The fluid pressure, vertical nominal strain, and Tresca stress for six time points (t equal to 500, 1000, 2000, 5000, 8000, and 12000 s) across the cartilage layer are plotted