Energy absorption of all-PET 2nd order hierarchical sandwich structures under quasi-static loading conditions

Velea, Marian N.; Lache, Simona

doi:10.1016/j.tws.2019.01.039

Cited by 7 publications

(4 citation statements)

References 33 publications

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“…As the core of the sandwich panel, various structural configurations have been introduced, including foams, 1–3 honeycombs, 4–6 corrugated, 7–10 and lattice truss structures. 11–14 Nonetheless, in recent years, the use of advanced manufacturing techniques such as additive manufacturing, as well as researchers’ efforts to find optimal and multifunctional structures, has resulted in the development of new geometries for sandwich panel cores such as hierarchical, 15–18 combined, 19–21 and hollow truss. 22–25…”

Section: Introductionmentioning

confidence: 99%

Effect of geometrical parameters on compression performance and energy absorption of pyramidal thin-walled tube core sandwich panel

Parsa,

Yazdani,

Belingardi

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Sandwich panels with pyramidal cores made of thin-walled tubes absorb energy very well, but their main limitation is the complexity of producing such a structure. This study utilized a novel self-interlocking assembly technique to fabricate the lattice core, significantly reducing fabrication time and material requirements. Experimental tests and finite element analyses were performed to investigate the effect of geometrical parameters on the out-of-plane characteristics of sandwich panels with pyramidal thin-walled tube cores and relative densities ranging from 1.39% to 3.96%. Finite element predictions for deformation mechanisms, compressive strength, and energy absorption match experimental results. The results reveal that the proposed approach for producing the nodes worked successfully, with no brazed nodes breaking. The amount of energy absorbed per unit of mass reduces by 22% and 27%, respectively, when the slenderness is increased from 3 to 5 and subsequently from 5 to 7. In addition, when the angle of the tubes is increased from 50° to 55°, it makes them 23% stronger and absorbs 13% more energy per unit mass. Regarding strength and energy absorption per unit volume, pyramidal thin-walled tube cores are better than traditional lightweight sandwich panels, especially at lower relative densities.

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Section: Introductionmentioning

confidence: 99%

Effect of geometrical parameters on compression performance and energy absorption of pyramidal thin-walled tube core sandwich panel

Parsa,

Yazdani,

Belingardi

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The honeycomb sandwich structure, with its impressive mechanical properties, including high strength, low weight, and superior energy absorption capacity, has been widely employed in a range of fields, including aerospace, ships [1], and vehicles [2,3]. Due to the challenging application environments, sandwich panels' performance requirements are demanding, which has led to extensive studies aimed at optimizing the honeycomb sandwich structures [4,5].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics and Effective Stiffness Properties of Sandwich Panels with Hierarchical Hexagonal Honeycomb

Bai,

Chen,

Yang

et al. 2023

Materials

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The dynamic characteristics of sandwich panels with a hierarchical hexagonal honeycomb (SP-HHHs) show significant improvements due to their distinct hierarchy configurations. However, this also increases the complexity of structural analysis. To address this issue, the variational asymptotic method was utilized to homogenize the unit cell of the SP-HHH and obtain the equivalent stiffness, establishing a two-dimensional equivalent plate model (2D-EPM). The accuracy and effectiveness of the 2D-EPM were then verified through comparisons with the results from a detailed 3D FE model in terms of the free vibration and frequency- and time-domain forced vibration, as well as through local field recovery analysis at peak and trough times. Furthermore, the tailorability of the typical unit cell was utilized to perform a parametric analysis of the effects of the length and thickness ratios of the first-order hierarchy on the dynamic characteristics of the SP-HHH under periodic loading. The results reveal that the vertices serve as weak points in the SP-HHH, while the vertex cell pattern significantly influences the specific stiffness and stiffness characteristics of the panel. The SP-HHH with hexagonal vertex cells has superior specific stiffness compared to panels with circular and rectangular vertex cells, resulting in a more lightweight design and enhanced stiffness.

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“…Marian et al [12] investigated the behavior of a hierarchical sandwich structure consisted of self-reinforced poly-ethylene terephthalate (PET) combined with PET foam and performed the specific energy absorption in quasi-static loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Energy absorption characteristics of three-layered sandwich panels with graded re-entrant hierarchical honeycombs cores

Tan

et al. 2020

Aerospace Science and Technology

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Two innovative re-entrant hierarchical sandwich panels constructed by substituting the cell walls of re-entrant honeycombs with isotropic regular hexagon substructure (RHH) and equilateral triangle substructure (RHT) are proposed in this paper, and their crashworthiness performance has been investigated systematically. Based on the Euler beam theory, the Young's moduli of units of re-entrant hierarchical sandwich panels are derived. A comparison between the re-entrant hierarchical sandwich panels and re-entrant sandwich panel has been conducted to study their energy absorption ability. Furthermore, the parametric analysis based on numerical analysis has been carried out to discuss the effects of the gradient, arranged orientation of hierarchical sandwich cores and the impact velocities.Results show that both the two proposed sandwich panels can greatly improve the in-plane stiffness and the energy absorption capacity, and the energy absorption mechanisms are discussed. In addition, the graded sandwich panels can effectively reduce initial peak force under quasi-static compression, and the configuration of large-medium -small (LMS) performs the best when under high impact velocity. The cross-arranged cores can significantly improve the impact resistance ability of RHT sandwich panels.This work provides a new solution for designing lightweight sandwich structures.

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Energy absorption of all-PET 2nd order hierarchical sandwich structures under quasi-static loading conditions

Cited by 7 publications

References 33 publications

Effect of geometrical parameters on compression performance and energy absorption of pyramidal thin-walled tube core sandwich panel

Effect of geometrical parameters on compression performance and energy absorption of pyramidal thin-walled tube core sandwich panel

Dynamic Characteristics and Effective Stiffness Properties of Sandwich Panels with Hierarchical Hexagonal Honeycomb

Energy absorption characteristics of three-layered sandwich panels with graded re-entrant hierarchical honeycombs cores

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