Effect of Incising on Bending Properties of Redwood Dimension Lumber.
Forest Service research paper,
FOREST PRODUCTS LAB MADISON WIS
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Three incising patterns were evaluated for their effects on the important bending properties of dimension-size redwood lumber. Two of the patterns were open, not widely spaced, incisings a third was a closely spaced diagonal pattern. Test material was above the fiber saturation point and included a range in specific gravity representative of redwood. Incising effects on bending properties of redwood varied with pattern and depth of incisions. Values for energy absorbed were reduced most for modulus of elasticity, least and for modulus of rupture, to an intermediate degree. Two open patterns of incising, on the average, reduced modulus of rupture about 10 and modulus of elasticity about 5. A closely spaced diagonal pattern of incising caused about twice as much loss in strength.
- Wood, Paper and Related Forestry Products