A Corrosion Inhibiting Coating for Structural Airframe Fasteners

Document Number: 730901

Date Published: February 1973

Author(s):
J. H. Ruhl - Huck Manufacturing Co.
R. L. Hurd - Huck Manufacturing Co.

Abstract:
This paper summarizes the common knowledge available on the fatigue characteristics of low-shear transfer aircraft joints and explores some of the means for providing the desired performance with improved fastener systems. Factors to be considered for this type of joint to provide optimum joint redundance are: provide for optimum interference conditions in the shank area or produce optimum hole cold expansion; provide for flush recess material cold working and/or produce head interference as close to optimum as possible; clamp faying surfaces during hole preparation and shot peen this area; produce high quality holes that minimize irregularities, galling, laps, sharp edges, or excessive temperatures; provide protruding head and nut/collar local com- pression loading at hold edges, or coin around the hole with the fastener assembly; use the proper fastener preloads to provide adequate clamp force friction and to minimize fretting; and test chosen joint materials with the selected fastener geometries and characteristics to the aircraft flight spectrums under study.

Product Status: In Stock

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