Energy absorption of foam-filled corrugated core sandwich panels under quasi-static loading

Taghipoor, Hossein; Sefidi, Mahdi

doi:10.1177/14644207221110483

Cited by 16 publications

(5 citation statements)

References 56 publications

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“…There are various types of conventional core materials, such as foam core, corrugated core, honeycomb core, truss/lattice core, and hybrid core that amalgamates foam with another type of core structure. The selection of the core material hinges upon the specific application requirements and loading characteristics [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Functionally varied negative-stiffness metamaterial core sandwich structures with three-phase bending deformation

Aewzipo,

Olarnrithinun,

Aimmanee

2024

Smart Mater. Struct.

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This paper introduces a novel class of negative-stiffness (NS) core sandwich composite structures that exhibit unique mechanical performance, including shape recovery, superelasticity, and energy absorption in bending and shear mode. The core of these structures consists of a periodic cellular arrangement of double-curved beams (DCB) that undergo consecutive local snap-buckling transitions between multiple equilibrium states, enabling the structures to transition reversibly between their initial and deformed configurations. To characterize the force-displacement relationship of the core, a comprehensive analysis was conducted using a combination of 3D printed models and finite-element simulations. The metamaterial core with gradient-thickness negative-stiffness (GTNS) beams were examined under uniform compression, demonstrating that the snap-through behavior of the curved beams was intricately controlled by the beam thickness in each row. The numerical simulations accurately predicted the deformation characteristics of the graded cellular core, supporting the design of a metamaterial core with functionally varied beam thickness for nonuniform transverse loading. This led to spatially controlled NS core material with specific energy absorption of around 50 J/kg and an apparent core shear strength of 0.1 MPa, all mainly within the reusable elastic regime. The resulting sandwich structures efficiently mitigated the localized effect from concentrated compressive forces and achieved complete snap-through buckling in all curve beams. Three-point bending response revealed three distinct phases of flexural deformation: the local facial bending phase, the sequential core-snapping superelastic phase, and the global bending phase.

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Section: Introductionmentioning

confidence: 99%

Functionally varied negative-stiffness metamaterial core sandwich structures with three-phase bending deformation

Aewzipo,

Olarnrithinun,

Aimmanee

2024

Smart Mater. Struct.

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“…The findings of their study demonstrated that the influence of geometric parameters on effective performance played a crucial role in enhancing the mechanical properties of corrugated lattice-core sandwich plates. Taghipoor et al 8 obtained and analyzed the energy absorption of foam-filled corrugated core sandwich panels under quasi-static loading and their comparative findings indicate that the specific energy absorption rate of bi-core sandwich panels that have not been filled with foam surpasses that of the single trapezoidal core sandwich panels. Subani et al 9 investigated the static analysis of honeycomb sandwich structures using numerical methods and analyzed the sandwich structures under different boundary conditions and loadings.…”

Section: Introductionmentioning

confidence: 99%

Effects of various parameters on the mechanical properties of composite lozenge‐shaped core sandwich panels subjected to flat‐wise compression test

Zamani,

Ghareghani,

Hosseinnejad

et al. 2024

Polymer Composites

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This paper studied the compressive behavior of a composite sandwich panel with a lozenge‐shaped core reinforced with graphene nanoparticles (GNPs) under different conditions. The fabrication process involves the utilization of Kevlar fibers and epoxy resin to construct the sandwich panels, followed by introducing polyurethane (PU) foam through vacuum‐assisted resin transfer molding (VARTM). Flat‐wise compression testing is conducted to assess the mechanical properties and behavior of the sandwich panels. The study investigates the effect of various parameters, including core angle, core height, weight percentage (wt%) of GNPs, and PU foam, on the compressive strength of the structure. The experimental results are validated through finite element simulation using ABAQUS software, and a satisfactory agreement is observed between the simulated and experimental data. The research findings indicate that the inclusion of 3 wt% of GNPs in the structure leads to a notable 25% enhancement in the compressive strength of the sandwich panel. However, when the GNP content was further increased to 0.4 wt%, a contrasting trend was observed and the strength of the structure decreased by about 12%. Furthermore, an increase in the core angle is associated with a substantial 46% improvement in the sandwich panel's strength. Conversely, an increase in the core height is found to cause an 18% reduction in the sandwich panel's strength. Also, the addition of PU foam results in a significant increase of approximately 42% and 58% in the strength and energy absorption of the sandwich panel, respectively. This comprehensive parametric study offers valuable insights to engineers and designers seeking to construct sandwich panels with optimal strength against compressive loads.Highlights Adding GNPs modifies the mechanical properties of the sandwich panel. Adding 0.4% of GNPs leads to the reduction of the structure's strength. Increasing the core angle increases the sandwich panel's strength. Increasing the core height decreases the sandwich panel's strength. PU foam significantly increases the sandwich panel's strength.

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“…Qi et al 18 obtained through the quasi-static experiment that the smaller unit cell radius height ratio and length height ratio can produce more obvious negative Poisson's ratio effects. Hossein Taghipoor et al [19][20][21][22] have conducted many detailed studies on sandwich beams with expanded metal sheets as cores. These studies analyzed the impact of various parameters (such as the influence of the cell orientation and size of the cell, 21 the core layer number and thickness of the substrates, 20 and the direction of the lattice sheets) 19 on structural performance.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of periodic rectangular tube sandwich structure subjected to out-of-plane impact compression loading

Zhu,

Yuan,

Yang

et al. 2023

Jnl of Sandwich Structures & Materials

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Owing to its unique deformation form, negative Poisson’s ratio sandwich structure has attracted significantly widespread interest, especially in the impact protection field. However, inferior mechanical properties severely limit their practical applications. To enhance its mechanical properties, a new type of periodic sandwich structure of rectangular tube was designed and fabricated, and the structure presents negative Poisson’s ratio characteristic under out-of-plane impact compression load. To evaluate its mechanical properties, the deformation form and equivalent yield strength of the periodic rectangular tube sandwich structure were obtained through the split Hopkinson pressure bar (SHPB) experiment. A numerical model of the different wall thicknesses of periodic rectangular tube sandwich structure (PRTSS) was established, and the accuracy of the model was verified by comparing it with the deformation form and equivalent yield strength obtained from experimental results. The results show that with the increase of rectangular tube wall thickness in PRTSS, the equivalent yield strength increases, and the equivalent yield platform strain decreases. Moreover, through the simulation results under four different strain rates, it is obtained that the equivalent yield stress of PRTSS increases with the increase of strain rate, and the straining length of the equivalent yield platform decreases with the increase of strain rate. The effect of wall thickness and strain rate on PRTSS was analyzed, which provided certain guiding significance for the application of the structure in the field of impact protection.

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Energy absorption of foam-filled corrugated core sandwich panels under quasi-static loading

Cited by 16 publications

References 56 publications

Functionally varied negative-stiffness metamaterial core sandwich structures with three-phase bending deformation

Functionally varied negative-stiffness metamaterial core sandwich structures with three-phase bending deformation

Effects of various parameters on the mechanical properties of composite lozenge‐shaped core sandwich panels subjected to flat‐wise compression test

Mechanical properties of periodic rectangular tube sandwich structure subjected to out-of-plane impact compression loading

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