Manufacturing of Isogrid Composite Structures by 3D Printing

Forcellese, Archimede; Pompeo, Valerio Di; Simoncini, Michela; Vita, Alessio

doi:10.1016/j.promfg.2020.04.123

Cited by 21 publications

(11 citation statements)

References 13 publications

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“…Polyamides (PA) can also be reinforced with different types of nanofillers, including glass fibers and microspheres (Ref 11), but also with adding short carbon fibers (Ref 12,13). In previous papers, the authors demonstrated that FFF technology can be successfully used to realize composite isogrid structures, that are of interest in the aerospace field (Ref 14,15). As a matter of fact, isogrid are lattice structures realized by means of triangular stiffening ribs, in order to ensure high specific compression resistance to thin structures such as fuselage panels, fuel tanks, boosters, etc.…”

Section: Introductionmentioning

confidence: 99%

“…( Ref 16,17). Forcellese et al demonstrated that the geometric parameters of the elementary lattice cell and the structure, such as the rib thickness, rib width and cell height, have to be accurately chosen since they strongly influence the mechanical performances of the 3Dprinted isogrid (Ref 14,15). Specifically, according to the results shown by Wang and Abdalla (Ref 18) and by Elumalai et al (Ref 19), the authors demonstrated that buckling, that is the typical failure mode of compressive-loaded isogrid structures, can occur in two different modes: global and local buckling.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Geometric Parameters and Moisture Content on the Mechanical Performances of 3D-Printed Isogrid Structures in Short Carbon Fiber-Reinforced Polyamide

Pompeo

Forcellese

Mancia

et al. 2021

J. of Materi Eng and Perform

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The present paper aims at studying the effect of geometric parameters and moisture content on the mechanical performances of 3D-printed isogrid structures in short carbon fiber-reinforced polyamide (namely Carbon PA). Four different geometric isogrid configurations were manufactured, both in the undried and dried condition. The dried isogrid structures were obtained by removing the moisture from the samples through a heating at 120 °C for 4 h. To measure the quantity of removed moisture, samples were weighted before and after the drying process. Tensile tests on standard specimens and buckling tests on isogrid panels were performed. Undried samples were tested immediately after 3D printing. It was observed that the dried samples are characterized by both Young modulus and ultimate tensile strength values higher than those provided by the undried samples. Similar results were obtained by the compression tests since, for a given geometric isogrid configuration, an increase in the maximum load of the dried structure was detected as compared to the undried one. Such discrepancy tends to increase as the structure with the lowest thickness value investigated is considered. Finally, scanning electron microscopy was carried out in order to analyze the fractured samples and to obtain high magnification three-dimensional topography of fractured surfaces after testing.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Geometric Parameters and Moisture Content on the Mechanical Performances of 3D-Printed Isogrid Structures in Short Carbon Fiber-Reinforced Polyamide

Pompeo

Forcellese

Mancia

et al. 2021

J. of Materi Eng and Perform

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“…Many processes and materials are available today, or under development, ranging from polymers, to metals, to composites; in the case of metal additive manufacturing, the most common processes use powder bed fusion technologies, such as Electron Beam Melting or Selective Laser Melting [33]. Examples of isogrid stiffened panels or cylindrical shells fabricated by AM can be found in literature, especially for polymeric materials, such as PVC [34] or carbon fiber reinforced polymers [27,28]. An hybrid fabrication technique was used in [29] to build an isogrid-stiffened patch antenna.…”

Section: Manufacturing Techniquesmentioning

confidence: 99%

Geodesic domes for planetary exploration

Ossola

Brusa

Sesana

2020

Curved and Layered Structures

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Venus and the Ocean Worlds are emerging areas of interest for space exploration, as they can potentially host, or have hosted, conditions compatible with life. Landers and probes for in-situ exploration, however, must deal with very high external pressure, due to the environmental conditions, often resulting in thick and heavy structures. Robust, reinforced shell structures can provide a lightweight solution for the primary structure. In this frame, the isogrid layout is already a standard in aerospace, especially for flat panels or cylindrical shells. In this paper, isogrid-stiffened hemispherical shells, or “geodesic domes”, are described, focusing on the case of a concept of a Venus lander. Early design methods for both plain and geodesic domes subjected to external pressure are presented, providing design equations. Additive Manufacturing is identified as the key technology for fabricating metallic geodesic domes, due to the complexity of the internal features. Moreover, it allows to fabricate ports and integrated thermostructural systems in the same process, potentially resulting in improved performance or cost and schedule savings.

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“…Due to the advantages of high stability, superior damage tolerance [ 34 ], and light weight [ 35 , 36 ], grid stiffened panels have been applied in the aircraft and aerospace industries. Three main type of grids are used in practical applications [ 37 , 38 , 39 ], i.e., angle-grid, isogrid, and orthogrid. In this manuscript a novel type of rib-stiffened structure is proposed that is fabricated using SPIF.…”

Section: Introductionmentioning

confidence: 99%

Ultimate Load-Carrying Ability of Rib-Stiffened 2024-T3 and 7075-T6 Aluminium Alloy Panels under Axial Compression

et al. 2021

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Stringer-stiffened panels made of aluminium alloys are often used as structural elements in the aircraft industry. The load-carrying capacity of this type of structure cannot relieve the reduction in strength in the event of local buckling. In this paper, a method of fabrication of rib-stiffened panels made of EN AW-2024-T3 Alclad and EN AW-7075-T6 Alclad has been proposed using single point incremental forming. Panels made of sheets of different thickness and with different values of forming parameters were tested under the axial compression test. A digital image correlation (DIC)-based system was used to find the distribution of strain in the panels. The results of the axial compression tests revealed that the panels had two distinct buckling modes: (i) The panels buckled halfway up the panel height towards the rib, without any appreciable loss of rib stability, and (ii) the rib first lost stability at half its height with associated breakage, and then the panel was deflected in the opposite direction to the position of the rib. Different buckling modes can be associated with the character of transverse and longitudinal springback of panels resulting from local interaction of the rotating tool on the surface of the formed ribs.

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Manufacturing of Isogrid Composite Structures by 3D Printing

Cited by 21 publications

References 13 publications

Effect of Geometric Parameters and Moisture Content on the Mechanical Performances of 3D-Printed Isogrid Structures in Short Carbon Fiber-Reinforced Polyamide

Effect of Geometric Parameters and Moisture Content on the Mechanical Performances of 3D-Printed Isogrid Structures in Short Carbon Fiber-Reinforced Polyamide

Geodesic domes for planetary exploration

Ultimate Load-Carrying Ability of Rib-Stiffened 2024-T3 and 7075-T6 Aluminium Alloy Panels under Axial Compression

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