Table 33.
Elastic constants of wood (108 N/m2) measured on increment cores of 5 mm diameter of a pruned Douglas tree compared with a Douglas control tree grown in the same area. Measurements were at 12% wood moisture content [71].
| Elastic constants | ||||
|---|---|---|---|---|
| Elastic constants of wood (108 N/m2) |
||||
| Wave type | Pruned tree | Control tree | Difference (%) | |
| CLL | P waves | |||
| Average | 121.7 | 112.8 | 7.3 | |
| Range of variation | 32.4–292.6 | 25.2–261.3 | ||
| CTT | P waves | |||
| Average | 16.47 | 16.40 | 0.4 | |
| Range of variation | 11.3–27.4 | 10.1–29.1 | ||
| GLR | S waves | |||
| Average | 11.58 | 12.21 | −5.4 | |
| Range of variation | 5.4–17.9 | 7.29–20.3 | ||
| GLT | S waves | |||
| Average | 10.58 | 10.98 | −3.7 | |
| Range of variation | 6.5–15.9 | 6.4–16.5 | ||
| GTR | S waves | |||
| Average | 1.51 | 1.31 | 13.2 | |
| Range of variation | 0.6–4.6 | 0.67–2.8 | ||
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