Estudo do comportamento mecânico de juntas coladas submetidas ao carregamento combinado com variação da rigidez do adesivo

Abstract

In this work, the mechanical behavior in fracture was analyzed and due to the form factor of bonded metal joints subjected to loading combined with rigid and flexible adhesive. For this purpose, tests were carried out to characterize the mechanical properties of adhesives and to obtain critical fracture energies (GIc and GIIc) through the DCB (Double Cantilever Beam), ENF (End Notched Flexure) and the CBBM (Compliance Based Beam Method). The experimental data generated were compared with other studies, and with the computer simulation of the cohesive damage model (MDC) used in the Abaqus® finite element computer program. For metallic joints bonded with NVT 201-E rigid adhesive, the experimental and computational results showed good agreement. In this way, together with the results of previous work with rigid adhesive carried out at Adhesion and Adherence Lab, we can confirm the existence of the form factor and the satisfactory results of the cohesive damage model. However, for the flexible adhesive Masterpur 300, the ENF fracture energy characterization tests by ENF were not adequate, since there is no crack propagation until the plastic deformation of the metal joints is reached, however the form factor is also observed experimental results.