CRUSHING STRENGTH AND MODULUS OF ELASTICITY OF UNMACHINED LODGEPOLE PINE STEM SECTIONS COMPARED TO MACHINED DOWELS OF THE SAME DIAMETER - KERFED AND KERF-FREE, ROUND AND HALF-ROUND.

Edwin J. Burke, Peter Koch

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Six-inch-long cylindrical or half-cylindrical stem sections from suppressed stands in two western Montana locations, tested when dry in compression, showed that specific gravity and two mechanical properties - maximum crushing strength parallel to the grain, and modulus of elasticity (MOE) - are positively correlated with average rings per inch. Unmachined (not doweled) 2-inch-diameter and larger rounds have about one-third higher MOE and one-tenth higher maximum crushing strength than dowels of the same diameter that have had 1/4 to 1/2 inch of radius machined from them in the doweling process. A sub-experiment indicated that MOE of cylindrical stem sections nondestructively measured in compression parallel to the grain did not differ significantly from MOE measured on the sections in tension and bending.

    Original languageEnglish
    Pages (from-to)31-38
    Number of pages8
    JournalForest Products Journal
    Volume36
    Issue number3
    StatePublished - Mar 1986

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