Abstract
In this paper, toward the establishment of repair or strengthening method of steel structures by externally bonded patch plates, the static tensile tests and fatigue tests of adhesively bonded joints are carried out and the fatigue durability is evaluated. Two types of epoxy resin, Konishi E250 and Konishi E258R and two types of patch plates, steel and CFRP laminates are considered varying the thickness of patch plates and the applied stress ranges. The result shows that the fatigue life of adhesively bonded joints can be evaluated in the function of principal stress ratio, the ratio of principal stress range against principal stress at debonding by tensile test, independently to either the thickness/type of patch plates or type of adhesives under these two types of epoxy resin used in this study. Also, the fatigue limit is confirmed to be approximately at 30% of principal stress at debonding by tensile test.
