Cyclic Debonding of Unidirectional Composite Bonded to Aluminum Sheet for Constant-Amplitude Loading.
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
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Cyclic debonding rates were measured during constant-amplitude loading of specimens made of graphiteepoxy bonded to aluminum and S-glassepoxy bonded to aluminum. Both room-temperature and elevated-temperature curing adhesives were used. Debonding was monitored with a photoelastic coating technique. The debonding rates were compared with three expressions for strain-energy release rate calculated in terms of the maximum stress, stress range, or a combination of the two. The debonding rates were influenced by both adherend thickness and the cyclic stress ratio. For a given value of maximum stress, lower stress ratios and thicker specimens produced faster debonding. Microscopic examination of the debonded surfaces showed different failure mechanisms both for identical adherends bonded with different adhesive and, indeed, even for different adherends bonded with identical adhesives. jg p3
- Adhesives, Seals and Binders
- Inorganic Chemistry
- Laminates and Composite Materials
- Properties of Metals and Alloys