Influence of Laser Treatment on End Notched Flexure Bonded Joints in Carbon Fiber Reinforced Polymer: Experimental and Numerical Results

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.

Influence of hydrothermal ageing on CFRP single lap bonded joint pre-treated by laser texturing

“…In previous works of the authors, densities of treatment until 35% were investigated and correlated to the mechanical performance of end-notched flexure specimens. 8 The results showed that a density of treatment of 20% is connected to higher mechanical resistance. For this reason, a density of treatment of 20% has been adopted in this work.…”

“…5,6 Plasma and laser pre-treatments represent a valid alternative to traditional pre-treatments as they allow to of creation a rough surface in a repeatable and accurate way without using contact tools, which could contaminate the surface to be bonded. [7][8][9] Laser texturing for bonding CFRP laminates has been investigated by Palmieri et al 10 : they studied the relation between contact angle and ablation patterns, observing that the contact angle was stable within some time from the moment the pre-treatment was made. Energetic methods such as plasma and laser treatment make the surface of the CFRP chemically more reactive, as these methods involve breaking the superficial molecular bonds.…”

Influence of Laser Texturing and Coating on the Tribological Properties of the Tool Steels Properties

“…In this application, it is important to save the lubricant and decrease the coefficient of friction. Other possible applications are the increase in heat dissipation [19], reduction in corrosion of stainless steels [20], or enhancement of the adhesion with other substrate types [21].…”

Creep behaviour of adhesively bonded joints: A comprehensive review

“…The use of adhesives in bonded joints provides some key advantages over traditional mechanical fasteners, such as reduced stress concentration, improved damping properties, higher fatigue strength and lighter structures. [1][2][3] The techniques to predict the static strength of bonded joints is well widespread and have great importance since it allows engineers to design robust models. However, in many practical applications the bonded structures remain loaded for long times, for example, in (1) aircrafts: stringers in both fuselages and wings, ailerons and spoilers, 4 or (2) automobiles: front hood, roof to body side, door hinge reinforcement panels.…”