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Publication Information

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Title: Analytical determination of the surface area of a threaded fastener

Author: Rammer, Douglas R.; Zelinka, Samuel L.;

Date: 2008

Source: Journal of testing and evaluation. Vol. 36, no. 1 (Jan. 2008): Pages 1-9.

Publication Series: Miscellaneous Publication

Description:

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.

Keywords: Metals, testing, fasteners, corrosion, joints, failure, screws, mathematical models, equations, wood preservatives, connectors, surface area, preservatives, chromated copper arsenate, CCA, preservative treated wood, treated wood

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

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Citation:


Rammer, Douglas R.; Zelinka, Samuel L. 2008. Analytical determination of the surface area of a threaded fastener. Journal of testing and evaluation. Vol. 36, no. 1 (Jan. 2008): Pages 1-9.

 


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