Figure 18. The force-deflection curve calculated with the fast-running, rigid-wall model is similar to that calculated with the full-support structure, making it useful for performing parametric calculations. Graphs A and B.

1. Force-deflection. This graph shows three distinct lines. The first line is solid red and is labeled Rigid Walls. The second line is solid black and is labeled Full Support Structure. The third and final line is dotted blue and is labeled Grade 1 test 418. The vertical axis of this graph ranges from 0 to 60 and represents Energy (kilonewton-millimeters) while the horizontal axis of this graph ranges from 0 to 180 and represents Deflection (millimeters). All three lines begin at the points of zero on both the vertical and horizontal axes. The first line, the red line, rises in at a slope to the point of 48 on the vertical axis and 50 on the horizontal axis. From this point the red line drops significantly to the point of 20 on the vertical axis and 85 on the horizontal axis where it then descends unevenly across the remainder of the graph until it leaves at the points of 6 on the vertical axis and 180 on the horizontal axis. The second line, solid black rises in at a slope to the point of 48 on the vertical axis and 50 on the horizontal axis. From this point the black line drops significantly to the point of 14 on the vertical axis and 85 on the horizontal axis where it then descends unevenly across the remainder of the graph until it leaves at the points of 4 on the vertical axis and 180 on the horizontal axis. The third line, dotted blue, rises in at a slope to the point of 48 on the vertical axis and 50 on the horizontal axis. From this point the blue line drops significantly to the point of 8 on the vertical axis and 85 on the horizontal axis where it then spikes diagonally to the point of 14 on the vertical axis and 110 on the horizontal axis. From this point the line then descends gradually in a near straight line until it leaves the graph at the point of 8 on the vertical axis and 180 on the horizontal axis.

2. Energy-deflection. This graph shows three distinct lines. The first line is solid red and is labeled Rigid Walls. The second line is solid black and is labeled Full Support Structure. The third and final line is dotted blue and is labeled Grade 1 test 418. The vertical axis of this graph ranges from 0 to 5,000 and represents energy (kilonewton-millimeters) while the horizontal axis of this graph ranges from 0 to 200 and represents Deflection (millimeters). All three lines begin at the points of zero on both the vertical and horizontal axes. The solid red line slows upwards and off the graph at the points of 4,400 on the vertical axis and 200 on the horizontal axis. The solid black line slopes upwards and off the graph at the points 4,200 on the vertical axis and 200 on the horizontal axis. Finally, the dotted blue line slopes upwards and off the graph at the points of 4,000 on he vertical axis and 200 on the horizontal axis.

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FHWA-HRT-05-096