Surface treatment for adhesive-bonded joints by excimer laser

Galantucci, Luigi Maria; Gravina, Noel; Chita, Giuseppe; Cinquepalmi, M.

doi:10.1016/1359-835x(96)88890-7

Cited by 37 publications

(22 citation statements)

References 11 publications

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“…The shear strengths measured in this work are substantially greater than those found by Galantucci et al . (1996 ) on single lap joints of carbon fibre composite epoxy bonded to aluminium Al2024 T3.…”

Section: Resultscontrasting

confidence: 83%

The performance of aluminium to carbon fibre composite bonded joints in motorsport applications

1999

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Race car manufacturers have been adhesive bonding composite monocoques for more than 15 years. The latest Grand Prix cars have more than 60 bonded joints and there is increasing interest in structural bonding of dissimilar materials. However, static strength and fatigue durability data for designing adhesive bonded joints between metallic and composite components in a race car chassis are likely to be over‐conservative when generated using standard single lap joint bonded specimens. Experimental work has been carried out using modified single lap joint specimens to generate fatigue and static strength design data for the case of an aluminium alloy bonded to carbon fibre composite using a cold cured epoxy adhesive. Test specimens were modified by changing the ratio of the width of the carbon fibre to aluminium adherends in the range from 1:1 to 2:1 to provide a better representation of the case of small metal components being attached to larger composite structures. The mean static strength of the standard single edge lap specimens with a 1:1 width ratio of adherend was 22% lower than the specimens with wider carbon fibre composite adherends. Modifying the aluminium adherend in the 2:1 width ratio specimens by changing the end from square to semicircular increased the mean static strength by a further 23%. The 2:1 width ratio specimens also had substantially increased fatigue lives compared with the standard 1:1 width ratio specimens. At a nominal shear stress range of 12 MPa and R ratio of 0.06, the mean fatigue life of the wider specimens was increased by almost a factor of five. Examination of the failed specimens supported the hypothesis that the edges of the bonded area are the dominant factor in the failure process. The practical outcome of this work is to question the use of standard test geometries when generating strength and durability data for the design of adhesive bonded components for motorsport applications.

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Section: Resultscontrasting

confidence: 83%

The performance of aluminium to carbon fibre composite bonded joints in motorsport applications

1999

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“…Galantucci et al used excimer laser treatment of metals and carbon fiber composites to improve the adhesion joint strength [15]. The authors used large laminar spot to modify the surface roughness, which they have observed to reduce glycerine contact angle (CA).…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Texture on the Adhesion Performance of Laser Treated Ti6Al4V Alloy

Maressa

Anodio

Bernasconi

et al. 2014

The Journal of Adhesion

107

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The growing demand in lighter and safer structures generates the requirement of lighter joining strategies, particularly for lightweight metal alloys, composites, and also joining dissimilar materials together. Titanium alloys stand out as the conventional choice for materials for light weight structures. Adhesive bonding of titanium is an appealing route for joint design, also for the possibility of joining it with dissimilar materials. The realization of a strong joint depends not only on the joint design and type of adhesive, but also on the preparation of the adhering surface. Laser texturing presents advantages compared to common surface preparation processes in terms of eco-compatibility, energetic efficiency, ease of manufacturing, and repeatability. This work presents a preliminary investigation on laser texturing of Ti6Al4 V alloy with a pulsed fiber laser source with the aim to increase surface adhesion for bonding. Particularly, different surface textures are proposed, and laser machining strategies are developed. The results showed that laser texturing provided up to eightfold and 30% higher shear strength compared to plain and sand blasted surfaces, respectively. Failure analysis showed that a margin of improvement is still possible by adapting the surface texture for better cavity filling and reducing surface damage caused by the laser treatment.

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“…ytterbium (Yb) fiber laser. [6][7][8][9][10][11][12] Experimental data have shown that pulsed laser ablation (PLA) can induce a beneficial action on the strength of adhesive joints because of simultaneous modifications of surface morphology and chemistry. [13][14][15] Previous work carried out by the authors indicated that PLA of steel and aluminum substrates enhance the mechanical behavior of single lap joints (SLJ) because of the increased contact area between the adhesive and the substrates, the improved mechanical interlocking and chemical (interfacial) interactions.…”

Section: Introductionmentioning

confidence: 99%

On the effect of pulsed laser ablation on shear strength and mode I fracture toughness of Al/epoxy adhesive joints

Chiodo

Alfano

Pini

et al. 2015

Journal of Adhesion Science and Technology

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The present work describes an experimental study about the shear strength and the mode I fracture toughness of adhesive joints with substrates pre-treated by pulsed laser ablation. An ytterbium-doped pulsed fiber laser was employed to perform laser irradiation on AA6082-T4 alloy. Morphological and chemical modifications were evaluated by means of surface profilometry, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Thick adherend shear tests were carried out in order to assess the shear strength while the mode I fracture toughness was determined using the double cantilever beam. For comparison, control samples were prepared using classical surface degreasing. The results indicated that laser ablation has a favorable effect on the mechanical behavior of epoxy bonded joints; however, while a + 20% increase was recorded for shear strength, a remarkable threefold enhancement of fracture toughness was observed with respect to control samples. XPS analyses of treated substrates and SEM observations of the fracture surfaces indicated that laser pre-treatment promoted chemical and morphological modifications able to sustain energy dissipation through mechanical interlocking. As a result cohesive failure within the adhesive bond-line was enabled under predominant peel loading.

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Surface treatment for adhesive-bonded joints by excimer laser

Cited by 37 publications

References 11 publications

The performance of aluminium to carbon fibre composite bonded joints in motorsport applications

The performance of aluminium to carbon fibre composite bonded joints in motorsport applications

Effect of Surface Texture on the Adhesion Performance of Laser Treated Ti6Al4V Alloy

On the effect of pulsed laser ablation on shear strength and mode I fracture toughness of Al/epoxy adhesive joints

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