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Adhesive Lap Joint

A single-lap bonded joint carries load in shear over the overlap: τ_avg = P/(b·L). The real stress peaks sharply at the two ends of the overlap, so beyond a certain length adding overlap buys little — design to the average with margin, and keep adherends thin and stiff.

Applied load P (N)

Bond width b (mm)

Overlap length L (mm)

Adhesive shear strength (MPa)

Average shear

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Factor of safety

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Overlap for FoS = 1

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Average-shear (uniform) model — ignores the end peak stresses of the Volkersen/Goland-Reissner analysis. A helper, not a substitute for engineering judgment.