The Report describes tests, whose object is the study of the resistance to slipping, under dynamic fatigue loading, of high strength bolted connections with protected faying surfaces. It also gives the results of similar tests made by other organizations. Fatigue tests were made with specimens having faying surfaces which had been given protective coatings of sprayed aluminum or of alkaline silicate zinc dust paint. For each of the two methods of protection, the fatigue tests were made in the pulsating tensile range of applied loading with R = P sub u: p sub o = 0.075; specimens with a protective coating of sprayed aluminum were also tested in the alternating range of the applied loading with R = 1. The results of the fatigue tests showed that both in the dynamic tensile tests and in the alternating tests the specimens sustained two million load cycles without the slip exceeding 150 microns. The maximum loads for a value of R = 0.075, allowed the calculation of coefficients of friction up to: 0.75 in the case of faying surfaces with a protective coat of sprayed aluminum, 0.75 in the case of faying surfaces with a protective coat of alkaline silicate dust paint and for a value R = -1 at least: 0.70. For neither of the two methods of protection did the fatigue loading have a more adverse effect on the coefficient of friction than that resulting from static loading of short or prolonged durations.

  • Supplemental Notes:
    • Restrictions on the use of this document are contained in the explanatory material.
  • Corporate Authors:

    International Union of Railways

    Office of Research and Experiments
    Utrecht,   Netherlands 
  • Publication Date: 1970-10

Media Info

  • Features: Figures; Tables;
  • Pagination: 47 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00052901
  • Record Type: Publication
  • Source Agency: International Union of Railways
  • Report/Paper Numbers: D90/RP 5/E
  • Files: TRIS
  • Created Date: Nov 23 1976 12:00AM