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An experimental study was undertaken to assess the repeatability of debond growth rates in adhesively bonded joints subjected to constant-amplitude cyclic loading. This was done by comparing debond growth rates from two sets of cracked-lap-shear specimens that were fabricated by two different manufacturers and tested in different laboratories. The fabrication method and testing procedure were identical for both sets of specimens. The specimens consisted of aluminum adherends bonded with FM-73 adhesive. Critical values of strain-energy-release rate were also determined from specimens that were monotonically loaded to failure. The test results showed that the debond growth rates for the two sets of specimens were within a scatterband similar to that observed in fatigue crack growth in metals. Cyclic debonding occurred at strain-energy-release rates that were more than an order of magnitude less than the critical strain-energy-release rate in static tests.
fatigue, adhesive, cyclic debonding, strain energy, repeatability
Structures Laboratory, U.S. Army Research and Technology Laboratories (AVSCOM), NASA Langley Research Center, Hampton, VA
Aero-Space Technologist, NASA Langley Research Center, Hampton, VA