A Study of Fatigue Crack Propagation in a Coating Film on Base Metal

概要

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The strain concentration at the tip of fatigue crack in coating film such as electroplating, painting, lining, etc., is restrained by the base metal when both the materials are completely bonded. And the strain in the base metal increases due to the strain concentration in the coating film. As the binding effect decreases in the direction of thickness from the interface, the strain at the surface of coating film decreases with the thickness of the coating film. The strain also depends on the elastic moduli of coating film and base metal. In the present paper, the binding effect is calculated elastically with a simple model. The stress distribution near the circular hole of epoxy resin plate is measured by the reflective polariscope, before and after the plate has been bonded to another non-notched resin plate. The experimental results are found to agree well with the results of calculation on the simple model. These results are also applicable to the effect of lining thickness on the propagation rate of fatigue crack in bearing alloys lining on steel plates reported in the previous paper.
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