Design of a bonded anchorage for composite plates : influence of the adhesive plasticity
Résumé
While designing specific anchorage devices for a pedestrian bridge made with composite material [1], an interest was given to the use of adhesives exhibiting elasto-plastic behaviour. The use of the adhesive bonding technology for the anchorage of composite elements is indeed particularly well-suited when properly designed and realized as it reduces stress concentrations which occur when bolting is used for instance. The way an elastic adhesive joint transfers stresses is nowadays rather well-known, and has been studied by numerous authors who highlighted more particularly the concept of characteristic anchorage length [2]. Here, the use of an elasto-plastic adhesive was studied. Both experimental and theoretical analyses were conducted to investigate the influence of the non-linear behaviour of the polymeric adhesive. In the first part, the different tests will be presented including tensile tests on the adhesive, and tests on symetric double-lap joints using both elastic and elasto-plastic adhesives. Then, a finite element analysis will be described and its results compared to the obtained experimental ones. First comparisons made in the experimental part will focus on joint maximum capacities, and following comparisons on a parameter called slip which characterizes the way the joint is deformed in shear.