Effect of Pyrolytic Temperatures on the Longitudinal Strength of Dry Douglas-Fir

    Volume 1, Issue 4 (July 1973)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Page Count: 11


    Schaffer, EL
    Research engineer, Forest Products Laboratory, USDA,

    Abstract

    Compressive and tensile strength of dry Douglas-fir was measured through rapid constant deformation rate tests at temperatures from 25 to 288°C, at initial thermoequilibrium and after 2 h of heating.

    The tensile strength decreased slowly with increasing temperatures to 175°C. Above 175°C, the tensile strength reduces rapidly. This is attributed to alteration of the cellulosic fraction of wood.

    The compressive strength decreases more uniformly with temperatures increasing to 288°C due to changes occurring in all three basic wood components with change in temperature.

    A first-order reaction equation for bond rupture/formation was adopted to describe the response. Including only terms for bond rupture resulted in good correlation to the observed strength response at reaching thermoequilibrium.


    Paper ID: JTE10025J

    DOI: 10.1520/JTE10025J

    ASTM International is a member of CrossRef.

    Author
    Title Effect of Pyrolytic Temperatures on the Longitudinal Strength of Dry Douglas-Fir
    Symposium , 0000-00-00
    Committee D07