Estudo do comportamento mecânico de juntas coladas de material pultrudado

Abstract

For better adhesion between surfaces of pultruded profiles is generally opts for a pre-bonding treatment. Currently the most used in the surface treatment field is sanding, which tends to produce a residue (powder) and eventually heterogenias surfaces. This work investigated the mechanical behavior of bonded joints subjected to shear alternative surface treatments to sanding, which consisted of two primers applied by simply spraying with air drying. As union a single adhesive material was used for the proposed treatments in this research, as well as the bonded joints that had the sanded surface or were bonded without pretreatment. As an alternative to adhesive bonded joints with adhesive tape applied to surface treated with silane primer were also evaluated. 3 mm pultruded plates produced with polyester resin additives were selected for preparation of substrates. Compared to the joints that received no treatment, the primer hydrolyzed silane promoted an increase of approximately 1:45% in strength, the higher the sanding with 14.01% increase in the average maximum force supported shear. The second primer studied had underperformed the other, a reduction of 40% of the mechanical strength of the joints. According to statistical analysis, so as sanding the primer hydrolyzed silane did not influence the mechanical strength of the glued joints, which can be compared statistically with joints that received no treatment. The tapes showed high deformation and mechanical performance inferior to the others, differentiating statistically too. Regardless of surface treatment, sanding or primer hydrolyzed silane, no sample showed creep resistance.