A review of mechanical drilling on fiber metal laminates

Bonhin, Eduardo Pires; Müzel, Sarah David; Alves, Manoel; Botelho, Edson Cocchieri; Ribeiro, Marcos Valério

doi:10.1177/0021998320957743

Cited by 21 publications

(21 citation statements)

References 99 publications

(207 reference statements)

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“…51 It is worth noting that the damping factors of the Al 2 O 3 -SAJs are higher than those of the SiC-SAJs. This behavior was consistent with increasing the enclosed area by the hysteresis loops of the Al 2 O 3 -SAJs, Figure 15(c), compared to both NE and SiC-SAJs and thus, decreasing their dynamic modulus, Figure 17, which has inverse relationship with tan δ, equation (6).…”

Section: Tensile Propertiessupporting

confidence: 77%

“…In consideration of corrosion, weight, and stress concentration the bonded joints are preferred than bolted and/or riveted joints in which the drilled holes are always accompanied with delamination, fiber frying (burr), spalling, chipping, thermal degradation, and edge chipping 6,7 that significantly reduce the performance of the composite materials.…”

Section: Introductionmentioning

confidence: 99%

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Potential energy as a new approach for detection and monitoring of fatigue damage in scarf adhesive joints modified with nanoparticles

Khashaba

2022

Journal of Composite Materials

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In this study, fatigue results of the scarf adhesive joints (SAJs) were extensively analyzed regarding the effect of the adhesive materials (neat epoxy (NE), and SiC and Al2O3-nanocomposite), bond thickness (0.17 mm and 0.25 mm) on their dynamic properties, which include loss factor (tan δ), loss modulus ( E''), dissipated energy ( U d), potential energy ( U p), and storage modulus ( E'). Safe fatigue lives of the NE, SiC, and Al2O3-SAJs were estimated at different reliability levels. The experimental measurements revelated that reducing the adhesive layer thickness from 0.25 mm to 0.17 mm result in enhancing the tensile strength and stiffness of the SiC-SAJs by 9.6% and 4.4%, respectively, in return of 9.5% and 5.4% for the Al2O3-SAJ relative to the NE-SAJ. The strength and stiffness of the SiC-SAJs with 0.17 mm bond thickness are higher than those of the Al2O3-SAJ by 15.4% and 3.3%, respectively. The highest improvement of 22.0% in the fatigue strength was occurred for the SiC-SAJ with bond thickness of 0.17 mm in return of 4.8% for the Al2O3-SAJ. The U p was used for the first time (except author works) for monitoring and predicting the damage in the adhesive joints practically the change in the enclosed area of the hysteresis loop is too small to cause a large variation in the tan δ, E'', and U d. Damping factor of the NE-SAJs is marginally increased with the stress levels compared to the aggravated increase of both SiC and Al2O3-SAJs. Zhang model predicts well the potential energy and storage modulus specially at higher stress levels.

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Section: Tensile Propertiessupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Potential energy as a new approach for detection and monitoring of fatigue damage in scarf adhesive joints modified with nanoparticles

Khashaba

2022

Journal of Composite Materials

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“…[ 3,4 ] These properties come together with the weight reduction of the structure and the increased corrosion resistance and thermal insulation. [ 5 ]…”

Section: Introductionmentioning

confidence: 99%

“…[3,4] These properties come together with the weight reduction of the structure and the increased corrosion resistance and thermal insulation. [5] In the aeronautic and aerospace fields, the majority of the hybrid metal laminates need to be assembled together to form complex structures. The connection between metal sheet and composite laminas is normally carried out through mechanical fastening thus requiring the drilling of a large number of holes into the structures.…”

Section: Introductionmentioning

confidence: 99%

Temperature analysis in fiber metal laminates drilling: Experimental and numerical results

et al. 2022

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Drilling process of fiber metal laminates (FML) requires a proper design of the processing parameters to prevent the occurrence of several issues and minimize defects, which can be detrimental for the integrity of the parts. These aspects become more critical in dry machining used in aeronautic field. In this scenario, the monitoring of process temperature is crucial to obtain useful information for machining optimization since many critical factors, such as matrix burnout, fiber pull‐out and delamination, depend on the heat generated during the machining. The aim of this work is to monitor the temperature measured on the tool and workpiece during dry drilling of Al/GFRP (GLARE) and Al/CFRP (CARALL) hybrid laminates. The influence of the cutting speed on the temperature trends was analyzed. Two different set‐ups were designed to measure the temperature on the tool, near the cutting edge and on the flank, and inside the laminate, in both the metallic and the composite parts. In addition, a numerical model to analyze the process temperature trend during drilling has been developed. The increasing the spindle speed from 1500 to 8000 rpm resulted in a decreasing of maximum temperatures of approximately 10°C on the tool tip and on the flank for the GLARE, and of almost 20°C in the CARALL laminates. The numerical simulation also pointed that the temperature fields is dictated by the thermal properties of carbon and glass fibers: temperature profiles within the CARALL were found smoother than those observed in GLARE.

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“…As a consequence, drilling such components may lead to delamination damages and low-quality surfaces that lastly affect the FML in-service performances. To avoid delamination and reduce thrust forces when drilling stacked composites, the geometry of the drill bit can play a major role, but documentation on FMLs is still scarce [11]. In this context, the current research work aims at investigating the drillability of a TFML obtained via HMP composed of two AZ31B magnesium alloy external sheets and a core of PA6-GFRP.…”

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

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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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A review of mechanical drilling on fiber metal laminates

Cited by 21 publications

References 99 publications

Potential energy as a new approach for detection and monitoring of fatigue damage in scarf adhesive joints modified with nanoparticles

Potential energy as a new approach for detection and monitoring of fatigue damage in scarf adhesive joints modified with nanoparticles

Temperature analysis in fiber metal laminates drilling: Experimental and numerical results

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

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