Which outcome occurs when tensile stress exceeds the cohesive strength of an epoxy adhesive bond?

💡 Explanation

When tensile stress exceeds the adhesive's cohesive strength, the epoxy polymer chains internally separate because intermolecular forces are overcome, leading to crack formation and propagation within the bulk of the epoxy. Therefore cohesive failure results, not adhesive failure, substrate deformation, or corrosion which require interfacial weaknesses or external chemical reactions.

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