AbstractThe fracture mechanics of multilayered elastomeric composites was simulated by the Blister Test using a polyurethane (PU)/A1 base plate interfacial assembly. In the various systems studies, and hard or soft intrposed layer (∼50 μm) separated the bulk matrix (∼ 1000 μm) from the metal counterface, with a hard‐to‐soft modules ratio of 1.70. Debonding was performed at a constant pressurization rate 1 × 10−8m3/s corresponding to an average delamination rate of 0.25 m/s. Lateral hardening of the composite modules (negative transversal gradient of modulus) improved the fracture resistance (by 35) at the material interface, in conformance with analytical predictions. Particle‐dispersed and liquid‐doped systems exhibited a sharp attenuation (40 to 90) in the debond pressure. The latter results were substantiated by subjective assessement using optical microscopy, and were found consistent with stress concentration and weak conhesive fracture at the resin‐substrate inter
展开▼
