Figure 50. Comparison of ShoopDarnell model results with measured
contact areas (for coarse and fine meshes).
Figure 51. Comparison of the smooth and ribbed modal analysis tire models
with measured contact areas.
contact area is slightly less than the smooth model,
inside of the tire shoulder due to buckling of the car-
even after being corrected for the tread voids.
cass (as discussed later). This behavior strongly af-
fects the contact stress and area since adjacent nodes
Contact stress distribution
may alternate between high loads and no contact.
Contact stress measurements for the Wrangler HT
Figure 50 compares the ShoopDarnell models to the
were provided by Goodyear. For comparison, the
measured data.
modeled contact stresses were displayed at the same
Comparisons of the smooth and ribbed tread mo-
contour levels and color scheme, as shown in Figure
dal analysis models to measured data are shown in
52. Both models and measurements show high stress
Figure 51. Both models provide contact areas less
values at the tire shoulder and, to a lesser extent,
than the measured data at the high loads, indicating
along the tire centerline. Agreement with the meas-
that the models are slightly stiff. The ribbed model
ured contact stress distribution is excellent.
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