Enhancement of static strength and long term durability of steel/epoxy joints through a fiber laser surface pre-treatment

Rotella, Giovanna; Alfano, Marco; Schiefer, Tom; Jansen, Irene

doi:10.1016/j.ijadhadh.2015.08.009

Cited by 38 publications

(14 citation statements)

References 23 publications

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“…Moreover, Melcher and Banea pointed out that temperature also affects the fracture behavior of adhesive joints [13][14][15]. Alfano et al [16] indicated that surface pretreatment was required for reliable adhesive bonding. For this reason, they investigated the effect of a pretreatment method on the strength of Al/epoxy joints.…”

Section: Introductionmentioning

confidence: 99%

Fracture Analysis and Shear Strength of Aluminum/CFRP and GFRP Adhesive Joint in Fiber Metal Laminates

Ostapiuk

Bieniaś

2019

Materials

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Fiber metal laminates (FMLs) were initially developed under the motivation of the aerospace industry. Generally, they consist of aluminum and high strength glass fiber in polymeric layers, but the new challenge is to apply them with a carbon fiber. Pretreatment of aluminum is the main factor responsible for the adhesion between metallic and polymeric layers. The shear strength test a very popular method in the experimental joint of two components. In this article, the main aim was to compare the surface pretreatment and configuration of fibers in FMLs based on aluminum with glass and carbon fibers. The decisive factor of strength in adhesive or cohesive failure is first the type of fibers, and second, the surface preparation.

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Section: Introductionmentioning

confidence: 99%

Fracture Analysis and Shear Strength of Aluminum/CFRP and GFRP Adhesive Joint in Fiber Metal Laminates

Ostapiuk

Bieniaś

2019

Materials

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“…On top of this, PLA improves bond repeatability, as well as waste and cost reduction, and is also prone to automation. Previous literature works have indicated that PLA promotes significant modifications of surface morphology [8,9] and chemistry [10,11], leading to improvement in surface wetting [12,13] and mechanical interlocking [12,14], with consequent increases in bond toughness [15,16] and long term joint stability [18]. It may also outperform traditional joining techniques, such as riveting and fusion welding when dealing with dissimilar materials [19].…”

Section: Introductionmentioning

confidence: 99%

Improving adhesion of copper/epoxy joints by pulsed laser ablation

Hernandez

Alfano

Lubineau

et al. 2016

International Journal of Adhesion and Adhesives

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The purpose of the present work is to survey the effect of pulsed laser ablation on copper substrates (CuZn40) deployed for adhesive bonding. Surface pre-treatment was carried using an Yb-fiber laser beam. Treated surfaces were probed using Scanning Electron Microscopy (SEM) and X-Ray Photoelectron Spectroscopy (XPS). The mechanical performance of CuZn40/epoxy bonded joints was assessed using the T-peel test coupon.In order to resolve the mechanisms of failure and adhesive penetration within surface asperities induced by the laser treatment, fracture surfaces were surveyed using SEM.Finite element simulations, based on the use of the cohesive zone model of fracture, were carried out to evaluate the variation of bond toughness. Results indicated that the laser ablation process effectively modifies surface morphology and chemistry and enables enhanced mechanical interlocking and cohesive failure within the adhesive layer.Remarkable improvements of apparent peel energy and bond toughness were observed with respect to control samples with sanded substrates.

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“…In order to achieve a solid adhesive bond, the surface condition of the joints is of essential importance [6]. Contaminants such as oil deposits have to be removed by degreasing [7]. Another way to improve direct adhesion and promote mechanical interlocking between the joints is to increase the surface area by various techniques such as anodising, sand blasting or laser ablation [1,4,8].…”

Section: Introductionmentioning

confidence: 99%

“…So far, laser ablation to improve bonding properties has been implemented with scanning speeds far below the technical possibilities. Feng et al worked with a scanning speed of 100 mm/s [6], Rotella et al prepared the steel substrates for their lap shear tests at 500 mm/s [7], and Zinn et al at 800 mm/s [4]. However, laser systems are able to operate at much higher scanning speeds.…”

Section: Introductionmentioning

confidence: 99%

“…The maximum scanning speed of the laser system used for this work is 8000 mm/s [15], which implies a great potential regarding the efficiency of laser ablation. Rotella et al showed that higher laser scanning speeds lead to a lower degree of surface modification due to the shorter interaction time between the laser beam and the surface [7]. In another study, Feng et al found that a higher number of craters or dimples per square millimetre induced by the laser beam increases the shear strength of the adhesive bond [16].…”

Section: Introductionmentioning

confidence: 99%

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Time efficient laser modification of steel surfaces for advanced bonding in hybrid materials

Voswinkel

Kloidt

Grydin

et al. 2020

Prod. Eng. Res. Devel.

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Laser surface treatment of metals is one option to improve their properties for adhesive bonding. In this paper, a pulsed YVO4 Laser source with a wavelength of 1064 nm and a maximum power of 25 W was utilized to increase the surface area of the steel HCT490X in order to improve its bonding properties with a carbon fibre reinforced polymer (CFRP). Investigated was the influence of the scanning speed of the laser source on the bonding properties. For this purpose, the steel surfaces were ablated at a scanning speed between 1500 and 4500 mm/s. Afterwards the components were bonded with the adhesive HexBond™ 677. After lap shear tests were carried out on the specimen, the surfaces were inspected using scanning electron microscopy (SEM). The experiments revealed that the bonding quality can be improved with a high scanning speed, even when the surface is not completely ablated.

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Enhancement of static strength and long term durability of steel/epoxy joints through a fiber laser surface pre-treatment

Cited by 38 publications

References 23 publications

Fracture Analysis and Shear Strength of Aluminum/CFRP and GFRP Adhesive Joint in Fiber Metal Laminates

Fracture Analysis and Shear Strength of Aluminum/CFRP and GFRP Adhesive Joint in Fiber Metal Laminates

Improving adhesion of copper/epoxy joints by pulsed laser ablation

Time efficient laser modification of steel surfaces for advanced bonding in hybrid materials

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