Tests on steel plates without overt stress concentrations show that hot-dip galvanizing reduces the fatigue strength by only about 4 percent when cycled from zero to tension. Galvanizing in the presence of a notch reduces fatigue strengths by up to 28 percent at some stress levels when cycled from zero to tension. An analysis of the results indicates that this reduction is due to the loss of ductility of the galvanized steel plate as compared to the as-rolled (black) Plate. Initial coefficients of friction for galvanized plates in these tests (0.12) were about half of the value for plates with mill scale (0.21). In tests on high-strength bolted joints, under reversed loading, galvanized joints locked up after a few cycles of load, and cyclic slip ceased. Because of the action and the fact that fatigue failures of the connections occurred in front of the net section, the fatigue strength of galvanized friction type connections was comparable to that of identical black connections when cycled from zero to tension and from one-half compression to tension.

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  • Accession Number: 00043916
  • Record Type: Publication
  • Report/Paper Numbers: Proc Paper 9410
  • Files: TRIS
  • Created Date: Jun 1 1973 12:00AM