Figure 28. Less final hourglass energy is calculated with type 4 stiffness control than with type 3 viscous control. Graph.

This graph shows two distinct lines. The first is a solid green line labeled Viscous Hourglass Control while the second is a solid blue line labeled Stiffness Hourglass Control. The vertical axis of this graph ranges from 0.00 to 0.25 and represents Ratio of Hourglass to Internal Energies while the horizontal axis of this graph ranges from 0 to 200 and represents Deflection (millimeters). The green line begins near the top of the graph at the points of 0.22 on the vertical axis and zero on the horizontal axis and runs parallel with the vertical axis straight down to the points of zero on both the vertical and horizontal axes. From there, the green line gradually rises to the points of 0.02 on the vertical axis and 140 on the horizontal axis where it rises more steeply until it runs off the graph at the points of 0.05 on the vertical axis and 200 on the horizontal axis. The blue line begins at the points of zero on both the vertical and horizontal axes and gradually rises the length of the graph until it leaves the graph at the points of 0.04 on the vertical axis and 200 on the horizontal axis.

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FHWA-HRT-05-096