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Double cantilever beam joints were manufactured from spring steel substrates bonded together using a twopart epoxy adhesive, a two-component type second-generation acrylic adhesive, and a one-part polyurethane adhesive. Rheological behavior of the adhesives was measured with a dynamic mechanical analyzer. Mode I fracture behavior of the joints was investigated with a tensile test machine and a falling-wedge impact test machine changing opening speeds from 8.33×10 m/s to about 1.9 m/s. Although stable fracture was observed for the epoxy and polyurethane adhesives under the tested conditions, unstable (i.e. stick-slip) fracture was observed for the acrylic adhesive when increasing the opening speed. Adhesive fracture energy, GIC, was estimated using several methods. Different dynamic dependency of the fracture energy was observed depending on the type of adhesive, and correlation between the change of fracture energy against opening speed and the change of dynamic loss tangent against temperature was suggested.

Mode I Fracture Energy of Adhesive Joints Bonded with Adhesiveswith Different Characteristics Under Quasi-static and Impact Loading