Structural modeling of sandwich panels with additively manufactured strut-based lattice cores

Georges, Hussam; Großmann, A.; Mittelstedt, Christian; Becker, Wilfried

doi:10.1016/j.addma.2022.102788

Cited by 11 publications

(4 citation statements)

References 41 publications

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“…Therefore, the stiffness of the sandwich is affected by the sandwich's length. However, the strength of the core is independent of the length, as we observed in previous studies [50]. To verify the results determined by the derived model, the deviation from the results obtained by the finite element model is determined.…”

Section: Resultsmentioning

confidence: 54%

Mechanical Performance Comparison of Sandwich Panels with Graded Lattice and Honeycomb Cores

Georges,

García Solera,

Aguilar Borasteros

et al. 2024

Biomimetics

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The design of graded and multifunctional lattice cores is driven by the increasing demand for high-performance components in lightweight engineering. This trend benefits from significant achievements in additive manufacturing, where the lattice core and the face sheets are fabricated simultaneously in a single print job. This work systematically compares the mechanical performance of sandwich panels comprising various graded lattice cores subjected to concentrated loads. In addition to graded lattice cores, uniform lattices and conventional honeycomb cores are analyzed. To obtain an optimized graded lattice core, a fully stressed design method is applied. Stresses and displacements are determined using a linear elastic analytical model that allows grading the core properties in a layerwise manner through the core thickness. The analysis indicates the superior performance of graded lattice cores compared to homogeneous lattice cores. However, conventional honeycombs outperform graded lattice cores in terms of load-to-weight ratio and stiffness-to-weight ratio. This study provides valuable insights for the design of lattice core sandwich panels and the advantages of several design approaches.

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Section: Resultsmentioning

confidence: 54%

Mechanical Performance Comparison of Sandwich Panels with Graded Lattice and Honeycomb Cores

Georges,

García Solera,

Aguilar Borasteros

et al. 2024

Biomimetics

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“…By converting this system to a first-order equation system, the first-order system can be solved using an exponential ansatz function of the eigenvalues of the first-order system matrix. Further information about solving and converting the differential equation system is discussed in detail in [7].…”

Section: Higher-order Sandwich Theorymentioning

confidence: 99%

Analysis of strut‐based lattice cores in sandwich panels using homogenization and dehomogenization methods

Georges

Mittelstedt

Becker³

2023

Proc Appl Math and Mech

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The design freedom provided by additive manufacturing offers new opportunities to fabricate novel structures with a high lightweight potential, such as strut‐based lattice structures. These lattice structures consist of periodically repeated unit cells and can be used in several applications due to their outstanding mechanical performance. One of the possible applications are cores of sandwich panels since the strut‐based lattices offer comparable mechanical properties to conventional honeycomb structures. Moreover, multifunctional use of the sandwich core is enabled by allowing the heat and fluid transfer through the sandwich due to the open‐celled lattice structure. However, strut‐based lattices are rarely utilized as cores in sandwich panels in engineering practice. One of the main reasons for that is the unknown mechanical behavior of lattice cores. In particular, when the sandwich is subjected to concentrated loads, localized stresses and deformations occur in the sandwich core, leading to core damage. In this work, we present a novel analytical model to determine stresses and deformations in the struts of lattice cores of sandwich panels using homogenization and dehomogenization methods. The local core compression caused by localized transverse forces can also be determined by the derived model.

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“…This formula is similar to that applied in [27], with both following the basic principle of conservation of matter. It is difficult to calculate the force under complex service conditions through the formulas in structural mechanics directly [24]. The finite element calculation is theoretically feasible but limited by its great demand for computational power.…”

Section: Sample Preparationmentioning

confidence: 99%

Mechanical Performance and Failure Analysis of a 3D-Printed “Continuous Layer–Lattice Layer–Continuous Layer” Sandwich Structure

Nie,

Kong,

Zhang

et al. 2023

Polymers

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Sandwich structures are engineered with continuous layers surrounding the inner lattices, which combines the advantages of the high strength of the continuous layer and the light weight of the lattice layer. They are widely employed in weight-critical energy-absorbing engineering fields such as aerospace, automobile, and robotics. However, the application of sandwich structures made of polymer matrix composites is still limited due to lack of essential performance investigation and adequate reference data. The following innovative works are accomplished in this paper: (i) Continuous long glass fiber (CGF) is employed within the continuous layer of the sandwich structure, with composite short carbon fiber/polyamide (SCF/N) applied within the lattice layer. (ii) Sandwich structures with different cell types and orientations of the lattice infills are designed and prepared by additive manufacturing. (iii) The basic mechanical properties of the sandwich structures, i.e., the bi-directional tension/compression compound performance, failure modes and mechanisms in characteristic directions, are analyzed systematically. (iv) The effects of geometric features on the three-point bending properties of L-shaped sandwich structures are investigated and compared with those of pure SCF/N structures. The results show that the bending resistance per unit weight was up to 54.3% larger than that of pure SCF/N, while the weight could be decreased by 49%, and the bending flexibility before fracture could be increased by 44%. These studies contribute fundamental research data to the application of sandwich structures prepared by fiber reinforced polymer matrix composites.

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Structural modeling of sandwich panels with additively manufactured strut-based lattice cores

Cited by 11 publications

References 41 publications

Mechanical Performance Comparison of Sandwich Panels with Graded Lattice and Honeycomb Cores

Mechanical Performance Comparison of Sandwich Panels with Graded Lattice and Honeycomb Cores

Analysis of strut‐based lattice cores in sandwich panels using homogenization and dehomogenization methods

Mechanical Performance and Failure Analysis of a 3D-Printed “Continuous Layer–Lattice Layer–Continuous Layer” Sandwich Structure

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