Abstract
Abstract Times-to-failure vs. static load ([sgrave]c) in moist air and water were determined for aluminum butt-joints bonded with DGEBA-epoxy resins. A characteristic fracture marking was observed on the failed surfaces similar in shape to the mirror-markings observed on glass fracture surfaces. These markings were associated with the stress corrosion process and identified as regions of slow flaw growth originating from the bond edge. The flaw depth, rc , and the failure stress were correlated by ac/rc ½ =constant. Fracture energies, c, characteristic of the stress corrosion failure were calculated and the values obtained were in the range of 8 to 14J/m2 which are comparable to the threshold stress corrosion fracture energies, ISCC, of epoxy-aluminum bonds as determined by Mostovoy and Ripling (J. Adhesion 3, 145 (1971)). These results are discussed in terms of a slow flaw growth at the resin/metal boundary and an embrittlement of the material in the interfacial region.
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