Abstract
Surface pretreatment for bonding is one of the most important steps for the manufacturing of a reliable bonded joint. In this paper, the effectiveness of an innovative pretreatment by CO2 pulsed laser for bonding Carbon Fiber Reinforced Polymer (CFRP) was investigated. End Notched Flexure (ENF) specimens were made with different densities of laser treatment, and the respective fracture toughness was obtained through the Compliance-Based Beam Method (CBBM). Furthermore, a cohesive model for simulating debonding processes was illustrated, and the cohesive parameters were obtained by an inverse method. The achieved results represent a fundamental step for the development of a numerical model useful for the determination of laser texturing as a function of the applied local stress into the bonded joint.
Highlights
The aerospace and military industries more and more often require the manufacturing of complex geometry lightweight components with high specific strength and stiffness.In this context, the use of fibro reinforced polymeric composite materials, thanks to their peculiarities, play a fundamental role in achieving such performance
The results showed that the bilinear law was more suitable in the case of butt-joints made with brittle adhesive, while the trapezoidal law showed a better fitting with the results obtained from Double Cantilever Beam (DCB) joints made with ductile adhesive
The exponential law did not allow the interface elements to have a rigid behavior during the elastic part of the cohesive law
Summary
The aerospace and military industries more and more often require the manufacturing of complex geometry lightweight components with high specific strength and stiffness. The presence of singularities does not allow the designer to use criteria based on maximum stress, which are generally present at the edges of bonded joints, in particular in the case of brittle adhesives [20]. The entire surface to be bonded is usually subjected to a pre-treatment made with the same process parameters, without taking into account the possible presence of singularity in the stress flied during the working life of the bonded joint. The presented paper represents a fundamental step to optimize the laser texturing of the surface to be bonded, taking into account the presence of singularities of stress This first research consisted of investigating the effectiveness of a laser texturing on the mechanical resistance of CFRP bonded joints under mode II. A cohesive model was used to predict the behavior of the specimens and a comparison between three cohesive laws was carried out for evaluating the most suitable law for modelling the investigated phenomenon
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