Simultaneous bonding and forming of Mg fibre metal laminates at high temperature

Ghiotti, Andrea; Bruschi, Stefania; Kain, M.; Lizzul, Lucia; Simonetto, Enrico; Tosello, Guido

doi:10.1016/j.jmapro.2021.10.017

Cited by 9 publications

(4 citation statements)

References 32 publications

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“…The result is a sound TFML with dimensions 70 mm  30 mm  2 mm. The adhesion mechanisms of the PA6 matrix of the GFRP to the AZ31B sheets at varying metal surface treatment are reported in detail in [9], and are here summarized and represented in Fig. 2.…”

Section: Methodsmentioning

confidence: 99%

“…This method consists of the melting of the polymeric matrix, which flows and forms a bond before solidifying when cooled under mild pressure levels. The HMP effectiveness to join AZ31B magnesium alloy sheets with PA6-GFRP was studied in [9]. In this work the AZ31B surfaces were conditioned before joining through mechanical abrasion by sandblasting to increase the surface roughness and through annealing to change the metal surface chemistry.…”

Section: Introductionmentioning

confidence: 99%

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Drillability of Magnesium-Based Fiber Metal Laminates Obtained via Hot Metal Pressing with Different Metal Surface Treatments

Lizzul

Bertolini

Sorgato

et al. 2022

KEM

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The demand for lighter and more performant aerospace and automotive components has resulted in a substantial surge in a recent interest in parts made of Fiber Metal Laminates (FMLs). For such components, drilling operations are crucial for permitting subsequent assembly. However, drillability of fiber metal laminates is critical due to the heterogeneous thermal and mechanical properties of the metal and composite that form the laminate. In this framework, the current research work aims at understanding how drilling operations can be affected by different surface treatments carried out on AZ31B magnesium alloy sheets joined with Glass Fiber Reinforced Polyamide 6 (PA6-GFRP) via hot metal pressing to form the FML. To this end, the Mg/PA6-GFRP/Mg composites were first fabricated using AZ31B surfaces that were previously treated through sandblasting, annealing, and their combination. Dry drilling was then performed using twist and spur drill bits. The feed was also varied, using two levels. The thrust force, hole quality, delamination and fiber pull-out were considered to evaluate the FMLs drillability. Results showed that the magnesium alloy sheet treatment influenced the drillability, and that the drill bit had an effect too. In particular, sheets that were both sandblasted and annealed allowed the highest drillability avoiding delamination. The use of spur drill bits improved the drillability too, reducing the FML inflection under the drill bit load.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Drillability of Magnesium-Based Fiber Metal Laminates Obtained via Hot Metal Pressing with Different Metal Surface Treatments

Lizzul

Bertolini

Sorgato

et al. 2022

KEM

Self Cite

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“…[1] Various kinds of FMLs can be explored by combing different kinds of metals and fiber-reinforced composites, such as the common aramid fiber reinforced aluminum laminate (Arall), [2] glass fiber reinforced aluminum laminate (Glare), [3] carbon fiber reinforced aluminum laminate (Carall), [4] graphite or carbon fiber reinforced titanium laminate (TiGr), [5] and other new variants. [6][7][8][9][10] In addition to the numerous investigations on mechanical properties from the material point of view, recent investigations have also paid attention to the forming technique [11][12][13] and structural performance of FML, [14][15][16] which were aimed at extending the applications. By far, the most striking of FML is still its excellent damage tolerance, [17] which is the reason that FML can act as a promising candidate in aeronautics.…”

Section: Introductionmentioning

confidence: 99%

Identifying the contributions of constituents to the fracture performance and failure mechanism of fiber metal laminate

et al. 2023

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Fiber metal laminate (FML) is a damage‐tolerant material that has gained special attention in the aircraft industry. To clarify the confusing contributions of constituents to the quasi‐static fracture performance and failure mechanism, six kinds of glass fiber reinforced aluminum laminates (Glare) were designed. Quasi‐static fracture tests were carried out to examine their crack resistance, stable crack extension, and residual strength. Moreover, postmortem characterizations were performed to reveal the macro and micro failure morphologies. It was found that the glass fiber reinforced polymer (GFRP) layers can positively contribute to Glare's quasi‐static fracture performance due to its in‐situ quasi‐brittle but not completely brittle fracture characteristics, which was shown by the special plateau formed on P–Δa curve of Glare, and by the improved crack resistance, longer critical crack length, and higher residual strength in Glare with higher content of GFRP. However, the enhancement achieved by increasing the volume fraction of GFRP was not as effective as by increasing the aluminum thickness, since thickening aluminum in a limited range could increase the fracture toughness and promote the delamination and fiber pull‐outs in Glare. To further identify the effect of the properties of the metal layer, a titanium‐reinforced Glare was designed and tested. It was found to transform the fracture process to be titanium dominant, which delayed the fracture of GFRP and meandered the fracture path, then resulted in superior quasi‐static fracture performance than the basic Glare.

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“…The FML part thickness variation during the fabrication process significantly depends on the part geometrical features. In the stamping process of hat-shaped parts, a reduction of the thickness was observed at the radii at the bottom as a consequence of high compaction forces [7]. Under a uniform normal pressure, the polymer matrix is squeezed transversely from the high-pressure region toward adjacent areas facing a lower load.…”

Section: Introductionmentioning

confidence: 99%

Compaction behaviour of magnesium alloy-based fibre metal laminates at varying forming parameters

Liu

2023

Materials Research Proceedings

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Abstract. This research presents a methodology for the compaction characterization of thermoplastic prepregs with a twill weaving style under a range of parameters typical of the thermoforming process applied to magnesium alloy-based fibre metal laminates (FMLs). The compaction tests were conducted making use of a plate-to-plate mode testing setup. The through-thickness and transverse width of the prepregs were evaluated on the FML specimen cross-section at varying compaction force and temperature. Significant deformations were observed at the lowest compaction force above the prepreg polymer melting point, whereas a further increase in the compaction force led to gradually smaller through-thickness and in-plane deformations. Additionally, a higher decrease in thickness and increase in width of the prepregs were detected at higher temperatures.

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Simultaneous bonding and forming of Mg fibre metal laminates at high temperature

Cited by 9 publications

References 32 publications

Drillability of Magnesium-Based Fiber Metal Laminates Obtained via Hot Metal Pressing with Different Metal Surface Treatments

Drillability of Magnesium-Based Fiber Metal Laminates Obtained via Hot Metal Pressing with Different Metal Surface Treatments

Identifying the contributions of constituents to the fracture performance and failure mechanism of fiber metal laminate

Compaction behaviour of magnesium alloy-based fibre metal laminates at varying forming parameters

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