Volume 36, Issue 1 (January 2008)

    Analytical Determination of the Surface Area of a Threaded Fastener

    (Received 19 September 2006; accepted 3 September 2007)

    Published Online: 2007

    CODEN: JTEOAD

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    Abstract

    Accurate determination of corrosion rates for threaded fasteners hinges on the ability to determine the surface area on which corrosion is occurring. Currently, no general analytical expression of surface area exists for the threaded fastener types. A recent voluntary withdrawal of chromated copper arsenate as the primary, long-standing preservative treatment for wood resulted in the need to determine the corrosion rates of threaded fasteners. This paper developed general analytical surface area equations for a wedge-shaped thread and the area between the threads for three cases: (1) an increasing thread root and crest diameter, (2) constant thread root and crest diameters, and (3) a constant thread root but a decreasing thread crest diameter. The expressions are applied, numerically verified, and compared to simplified models for a No. 10–2.54 cm (1-in.) long wood screw.


    Author Information:

    Rammer, Douglas R.
    Research General Engineer and Materials Engineer, U.S.D.A. Forest Service, Forest Products Laboratory, Madison, WI

    Zelinka, Samuel L.
    Research General Engineer and Materials Engineer, U.S.D.A. Forest Service, Forest Products Laboratory, Madison, WI


    Stock #: JTE100806

    ISSN: 0090-3973

    DOI: 10.1520/JTE100806

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    Author
    Title Analytical Determination of the Surface Area of a Threaded Fastener
    Symposium , 0000-00-00
    Committee G01