Characterising bonded joints with a thick and flexible adhesive layer–Part 1: Fracture testing and behaviour

An Experimental/Numerical Study on the Interfacial Damage of Bonded Joints for Fibre-Reinforced Polymer Profiles at Service Conditions

“…Within this context (i.e., innovative civil structures entirely made of composite materials), the safety and reliability of the adhesive bonding is still a field of investigation open to both theoretical-numerical and experimental contributions [1][2][3][4][5][6]. A recent study about adhesive bonded joints loaded in traction [7] focuses, in a general manner, on the interfacial damage which is affected by many factors, such as the thickness and width of the adherent, the number of lap surfaces, and the scarf angle (for scarf lap-joints).…”

Characterising bonded joints with a thick and flexible adhesive layer. Part 2: Modelling and prediction of structural joint responses

“…Part 1 of the paper [1] has described the experimental program which characterised the fracture behaviour and determined reliable fracture energies applicable to bonded joints using a rubbery polyurethane adhesive system with bondlines as thick as 3 mm. It was shown that, by designing the substrate geometry to provide sufficient flexibility, the frequently used double cantilever beam (DCB) method for mode I and single leg bending (SLB) for a mixed mode (mode mixity (GI : GII) of 4 : 3) generated consistent crack growth within the adhesive layer and provided reasonable and consistent fracture energies.…”

“…Since it was known the adhesive shows a fairly linear relationship in a shear (in the thick adherend shear test, TAST), with no extended stress plateau, a triangular rather than trapezoidal traction-separation law was selected for use in the FE modelling, see Figure 1. The only unknown parameter was the maximum traction in mode I, σmax, since the fracture energy was obtained from the testing detailed in part 1 of the paper [1]. The DCB test data for the specimens with 6 mm thick substrates showed relatively consistent crack growth in the adhesive layer and hence was selected for the calibration modelling because it exhibited the same failure mode as shown in the representative peel joint test, described in Section 3 of this paper.…”

Degradación ambiental y en condiciones adversas de adhesivos estructurales : análisis y consideraciones técnicas para su aplicación industrial

“…investigan, desarrollan y aplican nuevos materiales que permitan aligerar estructuras sin penalizar su resistencia, por ello los materiales compuestos de matriz polimérica con refuerzo de fibras (de vidrio, de carbono u otras) son cada vez más utilizados en la industria [1][2][3][4][5][6][7][8]. En muchas ocasiones, estos materiales compuestos deben ser unidos a otros similares o heterogéneos como es el caso de materiales metálicos como el acero o el aluminio [1,6,[9][10][11][12][13][14][15][16][17][18][19].…”

“…Existen muchos estudios que han investigado la unión entre metales y material compuesto, en general [1,6,9,[11][12][13][14][15][16][17][18][19][20], y la de aluminio y material compuesto con fibra de carbono en particular [9,12,13,20]; en ellos se profundiza sobre diferentes aspectos del diseño de la unión tales como el adhesivo más adecuado en función de las solicitaciones de la estructura unida, el tratamiento superficial más adecuado para cada sustrato [13] de modo que se favorezca la resistencia de la unión, tipo de unión y de ensayo de resistencia mecánica, envejecimiento de la unión por humedad, temperatura, agentes contaminantes naturales, químicos y otras investigaciones [6,[16][17][18].…”