Figure 35. These correlations between the LS-DYNA calculations and energy-deflection data were used to confirm that grade 1 Douglas fir can be simulated with the same parallel fracture energy and rate-effect parameters as grade 1 southern yellow pine, but with different quality factors. Graphs.

This graph shows eight distinct lines. The first line is solid aqua and is labeled Q subscript T equals 0.47 Q subscript C equals 0.63 G subscript F equals 50 while the second line is solid blue and is labeled Q subscript T equals 0.40 Qc equals 0.70 G subscript F equals 50. The remaining six lines are all solid pink and are labeled Grade 1 Douglas Fir Data. The vertical axis of this graph ranges from 0 to 10,000 and represents Energy (kilonewton-millimeters) while the horizontal axis of this graph ranges from 0 to 250 and represents Deflection (millimeters). All eight lines begin at the points of zero on both the vertical and horizontal axes. The solid aqua line slopes upward continually and off the graph at the points of 5,900 on the vertical axis and 250 on the horizontal axis. The solid blue line slopes upward gradually to the points of 4,200 on the vertical axis and 120 on the horizontal axis where it plateaus. The plateau rises slightly and runs off the graph at the points of 4,900 on the vertical axis and 250 on the horizontal axis. The first pink line slopes up to the points of 6,000 on the vertical axis and 150 on the horizontal axis where it ends. The second pink line slopes up to the points of 4,000 on the vertical axis and 170 on the horizontal axis while the third and fourth pink line slope up to the points of 3,800 on the vertical axis and 150 on the horizontal axis. The latter three lines all end at these points. The fifth pink line slopes up to the points of 3,300 on the vertical axis and 160 on the horizontal axis while the final pink line slopes up to the points of 3,000 on the vertical axis and 160 on the horizontal axis. These lines also end at those points.

The second graph shows three distinct lines. The first line is solid pink and is labeled Grade 1 Douglas Fir Test 2006 while the second line is solid aqua and is labeled Q subscript T equals 0.47 Q subscript C equals 0.63 G subscript F equals 50. The third and final line is sold blue and is labeled Q subscript T equals 0.40 Qc equals 0.70 G subscript F equals 50. 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 solid pink line moves across the graph in wave-like format, peaking first at the points of 0.42 on the vertical axis and 13 on the horizontal axis. From there it slopes downward to the points of 0.35 on the vertical axis and 23 on the horizontal axis. The pink line then slopes back up to the points of 0.45 on the vertical axis and 32 on the horizontal axis. The solid aqua line slopes up to the points of 0.7 on the vertical axis and 33 on the horizontal axis where it finds it end. The solid blue line slopes upward to the points of 0.5 on the vertical axis and 33 on the horizontal axis where it also ends.

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FHWA-HRT-05-096