Figure 44. Although the grade 1 pine post breaks earlier in time with Q subscript T equals 0.40 and Q subscript C equals 0.70, the calculated energy and velocity histories are similar. Graphs.

The first graph shows four distinct lines. The first line is solid black and is labeled Q subscript T equals 0.47 and Q subscript C equals 0.63 while the second is solid green and is labeled Q subscript T equals 0.40 and Q subscript C equals 0.70. The remaining two lines are both solid pink and are labeled Performance Envelopes. The vertical axis of this graph ranges from o to 10,000 and represents Energy (kilonewton-millimeters) while the horizontal axis of this graph ranges from 0 to 200 and represents Deflection (millimeters). All four lines begin at the points of zero on both the vertical and horizontal axes. The solid black line runs in a continuous slope across the length of the graph where it leaves the graph at the points of 4,600 on the vertical axis and 200 on the horizontal axis. The solid green line slopes upward to the points of 4,400 on the vertical axis and 200 on the horizontal axis where it ends. The first pink line slopes upward to the points of 5,000 on the vertical axis and 165 on the horizontal axis where it finds its end while the second pink line slopes up to the points of 3,800 on the vertical axis and 165 on the horizontal axis where it ends.

This second graph shows three distinct lines. The first line is pink dashed and is labeled Grade 1 Southern Yellow Pine test 657. The second line is solid black and is labeled Q subscript T equals 0.47 and Q subscript C equals 0.63 while the third and final line is solid green and is labeled Q subscript T equals 0.40 and Q subscript C equals 0.70. The vertical axis of this graph ranges from 0.0 to 1.0 and represents Velocity Reduction (meters per second) while the horizontal axis of this graph ranges from 0 to 60 and represents Time (milliseconds). All three lines begin at the points of zero on both the vertical and horizontal axes. The pink dashed line first peaks at the points of 0.45 on the vertical axis and 13 on the horizontal axis where it then slopes back down to the points of 0.32 on the vertical axis and 24 on the horizontal axis. From there the pink dashed line rises again to the points of 0.45 on the vertical axis and33 on the horizontal axis where it wavers across the remainder of the graph and exits at the points of 0.48 on the vertical axis and 60 on the horizontal axis. The solid black line slopes up steeply to the points of 0.54 on the vertical axis and 24 on the horizontal axis where it ends. The solid green line slopes up steeply where it comes to its end at the points of 0.6 on the vertical axis and 35 on the horizontal axis.

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FHWA-HRT-05-096