Abstract
The strength of cylindrical butt joints, fabricated by bonding either aluminum or steel adherends together with an epoxy adhesive, has been determined for a wide range of bond thicknesses. Joint strength varied significantly with bond thickness. The measured strength of joints with steel adherends varied as the inverse cube root of bond thickness, while the strength of joints with aluminum adherends varied as the inverse fourth root of bond thickness. This bond thickness dependence is accurately predicted by an analysis that assumes failure occurs at a critical value of the interface corner stress intensity factor. The difference in the measured joint strength-bond thickness relation for joints with aluminum and steel adherends is a consequence of the difference in the order of the interface corner stress singularity.
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Reedy, E., Guess, T. Interface Corner Failure Analysis of Joint Strength: Effect of Adherend Stiffness. International Journal of Fracture 88, 305–314 (1997). https://doi.org/10.1023/A:1007436110715
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DOI: https://doi.org/10.1023/A:1007436110715