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

Chiodo, Giovanni; Alfano, Marco; Pini, Stefano; Pirondi, A.; Furgiuele, Franco; Groppetti, R.

doi:10.1080/01694243.2015.1049325

Cited by 16 publications

(5 citation statements)

References 17 publications

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“…The disordered surface structures were proposed to be responsible for enhanced mechanical interlocking of the adhesive and the metal surface resulting in an increased SLS strength before and after aging and e.g. DCB-and T-peel strength of aluminum epoxy joints [22,23,49].…”

Section: Results In Context With Previous Studies Of Laser-pretreated...mentioning

confidence: 99%

Relationship between laser-generated micro- and nanostructures and the long-term stability of bonded epoxy-aluminum joints

Freund

Löbbecke

Delp

et al. 2023

The Journal of Adhesion

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To improve the mechanical performance and to address current shortcomings of adhesive bonds such as bond degradation due to aging, a pulsed laser surface pretreatment of the metal surfaces of aluminum AW 6082-T6 joints with epoxy adhesive E320 is investigated. The surface treatment of the specimens resulted in increased single-lap shear (SLS) strengths before and after hydrothermal aging in 80 °C hot water compared to non-pretreated reference specimens. In order to reveal the correlations of laser parameters, resulting surface morphologies and the SLS strength, differently laser pretreated surfaces were characterized at the micro-and nanoscale using optical and scanning electron microscopies. The surface enlargement was quantified with a digital image analysis of cross-sections prepared from the joint interfaces. An analysis of variances (ANOVA) of the SLS results indicated that the laser parameters power and pulse frequency were most critical for obtaining high SLS strengths. Pretreated joint surfaces with a high micro-and nano-surface enlargement and deep solidification structures provide high SLS strengths of up to 50 MPa and almost negligible aging losses of merely 4%. Undercut structures on the pretreated surfaces were found to be beneficial for the mechanical and aging properties when only limited micro-and nanostructuring was applied.

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Section: Results In Context With Previous Studies Of Laser-pretreated...mentioning

confidence: 99%

Relationship between laser-generated micro- and nanostructures and the long-term stability of bonded epoxy-aluminum joints

Freund

Löbbecke

Delp

et al. 2023

The Journal of Adhesion

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“…Finally, we emphasize that our results reiterate the need to integrate proper surface pre-treatments within the car body manufacturing. From this standpoint, previous works by the authors carried out on aluminum and titanium alloys 30,31 already indicated that pulsed laser irradiation might be an interesting potential candidate to the purpose. Indeed, current lasers are provided with high-precision beam positioning systems, which ensure the ability to treat the target surfaces selectively, and with fairly accurate geometrical control.…”

Section: T-jointsmentioning

confidence: 97%

Experimental analysis of steel joints bonded with automotive grade hot setting structural adhesives

Morano

Musiari

Moroni

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part L:

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Recent trends in car body manufacturing indicate that the use of a consistent mix of lightweight materials in conjunction with adhesive bonding, not only allows substantial weight reduction, but can also drive down costs and potentially enables more intelligent designs. Yet, presently, it is highly desirable that the introduction of structural adhesives is made with minimum impact on the automotive body framing systems. Adhesives commonly deployed in car body production (i.e. body-in-white) are applied without any prior surface preparation and final curing is carried out during the baking process that follows the electrophoretic coating. Several structural adhesives have been tailored to the conditions dictated by the automotive production process. The aim of this work is to assess the mechanical properties of adhesive joints bonded with automotive grade hot setting epoxy adhesives employed for the assembly of frame and panels. Single-lap and T-joints were fabricated and adhesive hardening was carried out following the typical curing cycle employed in the process chain of automobile production. The resulting mechanical properties were assessed before and after exposure to a standard accelerated thermal cycling under controlled humidity. The evaluation of the mechanical behavior was done through a combination of testing and analysis, which included the assessment of fracture surfaces using optical microscopy to resolve the locus of failure.

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“…Their study proved that fiber lasers are considerably promising in the field of material processing. [ 152 ] Hagiwara et al. investigated the use of fiber lasers with a high peak power for processing biomedical materials.…”

Section: Application Prospectsmentioning

confidence: 99%

“…Their study proved that fiber lasers are considerably promising in the field of material processing. [152] Hagiwara et al investigated the use of fiber lasers with a high peak power for processing biomedical materials. First, they used a hollow fiber to generate double pulses of 200 and 300 fs to improve the peak power of the pulses.…”

Section: Materials Processingmentioning

confidence: 99%

Generation of High‐Peak‐Power Femtosecond Pulses in Mamyshev Oscillators: Recent Advances and Future Challenges

Gao

et al. 2023

Laser & Photonics Reviews

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Mamyshev oscillators (MOs) have attracted significant attention given their potential in yielding ultrafast lasers with high peak power. Based on step‐like saturable absorbers and self‐similar evolution in the gain fiber, MO technology features an advanced system capable of generating ultrastable femtosecond pulses with ultrahigh peak power. In this review, the principle of MO is presented in terms of their transmission function and tolerance to nonlinear phase shift and recent progress is reported in the advanced output performance of MO, manifested through high peak power, few‐cycles, high repetition rate, and supercontinuum generation. MO with various operation wavelengths (1, 1.5, and 2 μm) are examined, and MO starting methods are fully discussed, followed by a detailed account of diverse potential applications in areas such as biomedical imaging and material processing. Based on current progress, the prospective challenges and future directions of MO are highlighted and discussed.

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

Cited by 16 publications

References 17 publications

Relationship between laser-generated micro- and nanostructures and the long-term stability of bonded epoxy-aluminum joints

Relationship between laser-generated micro- and nanostructures and the long-term stability of bonded epoxy-aluminum joints

Experimental analysis of steel joints bonded with automotive grade hot setting structural adhesives

Generation of High‐Peak‐Power Femtosecond Pulses in Mamyshev Oscillators: Recent Advances and Future Challenges

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