Low-Velocity Impact Properties of Sandwich Structures with Aluminum Foam Cores and CFRP Face Sheets

Rupp, Peter; Imhoff, Jonas; Weidenmann, Kay André

doi:10.3390/jcs2020024

Cited by 5 publications

(5 citation statements)

References 23 publications

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“…The 35 mm displacement measured is lower than the one obtained on the 5% infill PLA honeycomb tested specimen for 30 J, indicating a lower energy absorption. This impact response is very similar to the NOMEX honeycomb structures [8,9]. The multi-varied damage mode is specific to the yielding of a brittle material.…”

Section: Resultssupporting

confidence: 54%

“…Some of the authors found that the mechanical properties of sandwich structures are strongly related to the properties of cell wall and its geometry [8]. Others have discovered that compressive strength of the honeycomb structure is independent of height and cell size but rather dependent upon their relative density [9]. As for printing process, compared to a solid FDM printed part, the build time of the honeycomb pattern increased about 65% because of its complex geometry.…”

Section: Geometry Aspectsmentioning

confidence: 99%

See 1 more Smart Citation

Impact Behavior Analysis of 3-D Printed Honeycomb Structures

Stoica¹,

Maier²,

Istrate³

et al. 2022

Mater. Plast.

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The purpose of this paper is to evaluate the behaviour of 3D printed honeycomb structures under low velocity impact loading for their use in energy absorption applications. Additive manufacturing technologies are part of a growing field that represents high interest for industries such as aerospace, automotive and naval. This paper aims to determine the mechanical properties of a 3D printed polymer - Polylactic Acid (PLA) manufactured by FDM (Fused Deposition Modelling) technology. In this regard, first the material is characterized by low velocity impact dynamic experimental tests. A finite Element Analysis (FEA) is performed in LS-Dyna software in order to validate the results. The samples were manufactured by varying the infill percent to investigate the influence of different parameters on a batch of samples for every configuration. The 3D CAD modelling for impact tests samples were performed in Catia V5. Among wide range of cellular structures, honeycomb non-auxetic hexagonal cell pattern was selected in this study, assuring high strength/weight ratio. The amount of energy absorbed during the impact, the failure and degradation of the impacted specimens were monitored, following the analysis of experimental and numerical data. A fair agreement was obtained between experimental and numerical results, showing that honeycomb developed lightweight structures exhibits a proper energy absorption capacity, with a mechanism of release similar to metal or composite materials honeycombs.

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Section: Resultssupporting

confidence: 54%

Section: Geometry Aspectsmentioning

confidence: 99%

Impact Behavior Analysis of 3-D Printed Honeycomb Structures

Stoica¹,

Maier²,

Istrate³

et al. 2022

Mater. Plast.

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show abstract

“…Through X-CT analysis, it is possible to accurately identify the damage, quantify, and perform image-based modeling [29]. Low-velocity indentation tests were performed on carbon fiber reinforced polymer (CFRP) sandwich structures, and in situ X-CT analysis was performed to identify the damage mechanism [30,31]. It is also reported that X-CT proved to be the most accurate technique to identify the damage mechanisms [32].…”

Section: Introductionmentioning

confidence: 99%

Quasi-static indentation analysis on three-dimensional printed continuous-fiber sandwich composites

Dikshit

Nagalingam

Goh

et al. 2019

Jnl of Sandwich Structures & Materials

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Fiber reinforced sandwich structures are widely used as structural elements due to their lightweight and high load-bearing capacity. In this paper, effort is taken to fabricate fiber facesheet (0°/90° orientation) and corrugated cores (trapezoidal vertical pillared, core-1 and sinusoidal vertical pillared, core-2) of the sandwich structure using fused filament fabrication and Inkjet printing techniques, respectively. Firstly, the quasi-static indentation properties of the additively manufactured facesheet, cores, and sandwich structures were investigated. In addition, acoustic emission signals were monitored during quasi-static indentation testing and the resulting hits data were correlated with quasi-static indentation test results. The quasi-static indentation test results showed that sinusoidal sandwich structures have the highest load-bearing capacity of 1.79 kN until crack initiation and a total energy-absorption capacity of 20.05 J. Acoustic emission hits recorded in the range of 1–30, 30–100, and above 100 represented crack initiation, crack propagation, and specimen failure, respectively. Lastly, micro-computed tomography analysis was performed on the sandwich structures at intermediate indentation displacements, thus leading to the identification of hard to detect failure points and damage propagation. Fracture surface morphology of the sandwich structures showed that fiber pullout and core shear were the dominant damage mechanisms.

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“…For example, in the aerospace industry, where the specific stiffness of a component is of great importance, honeycomb core sandwich structures are of great interest [7]. Many researchers have studied the performance of different types of sandwich structures through experiments and numerical modeling; for example, Rupp et al [8] investigated the low-velocity impact behavior of sandwich composites manufactured using carbon fiber reinforced polymer facesheets and aluminum honeycomb and foam core structures. They observed that the peak force measured was dependent on the sandwich core type.…”

Section: Introductionmentioning

confidence: 99%

Mechanical performance of sandwich composites with additively manufactured triply periodic minimal surface cellular structured core

Fashanu

Rangapuram

Abutunis

et al. 2021

Jnl of Sandwich Structures & Materials

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Sandwich composite structures are comprised of a low-density core (commonly honeycomb) and facesheets. They are typically used in applications that require lightweight for efficient design, such as in the marine and aerospace industries. This work investigates the feasibility of adopting triply periodic minimal surface (TPMS) cellular structures as the core for sandwich composites. Sandwich structures were manufactured using a carbon fiber-reinforced polymer (CFRP) facesheet and three different 304 L stainless steel core structures (honeycomb, gyroid TPMS, and diamond TPMS). Three mechanical tests, namely edgewise compression, three-point bend, and impact test, were carried out to evaluate the performance of each sandwich configuration. The experimental results of the non-traditional sandwich configurations were compared against those of a honeycomb core sandwich composite. The edgewise compression test showed that the ultimate edgewise compressive strength increased by 7% when the honeycomb core was replaced by the gyroid core and reduced by 2% when the diamond core replaced the honeycomb core. The three-point bend test showed that the traditional honeycomb core sandwich configuration had a higher shear yield stress when compared to the non-traditional sandwich structures. The shear yield stress was reduced by 54% when non-traditional sandwich cores were used. The shear ultimate stress was reduced by 41% and 37% when the honeycomb core was replaced by the gyroid and diamond structure, respectively. Impact test results, on the other hand, showed that the peak force recorded during the impact event was reduced, while the absorbed energy was increased when non-traditional cores were used. Peak force was reduced by 28% and 39%, while the absorbed energy was increased by 9% and 16% when the honeycomb core was replaced by the gyroid and diamond cores, respectively.

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Low-Velocity Impact Properties of Sandwich Structures with Aluminum Foam Cores and CFRP Face Sheets

Cited by 5 publications

References 23 publications

Impact Behavior Analysis of 3-D Printed Honeycomb Structures

Impact Behavior Analysis of 3-D Printed Honeycomb Structures

Quasi-static indentation analysis on three-dimensional printed continuous-fiber sandwich composites

Mechanical performance of sandwich composites with additively manufactured triply periodic minimal surface cellular structured core

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