Experimental and numerical analysis of novel multi-layer sandwich panels under three point bending load

Farrokhabadi, Amin; Taghizadeh, Seyed Ahmad; Madadi, Hamidreza; Norouzi, Hossein; Ataei, Ahmad

doi:10.1016/j.compstruct.2020.112631

Cited by 61 publications

(26 citation statements)

References 36 publications

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“…The shear stress has the largest effect on the core tearing during the three-point bending test [ 11 , 29 , 30 ]. The shear strength of ABS is taken as half of the yielding stress.…”

Section: Resultsmentioning

confidence: 99%

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Mechanical Strength of Triply Periodic Minimal Surface Lattices Subjected to Three-Point Bending

Lin¹,

Pan²,

Li³

2022

Polymers

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Sandwich panel structures (SPSs) with lattice cores can considerably lower material consumption while simultaneously maintaining adequate mechanical properties. Compared with extruded lattice types, triply periodic minimal surface (TPMS) lattices have light weight but better controllable mechanical properties. In this study, the different types of TPMS lattices inside an SPS were analysed comprehensively. Each SPS comprised two face sheets and a core filled with 20×5×1 TPMS lattices. The types of TPMS lattices considered included the Schwarz primitive (SP), Scherk’s surface type 2 (S2), Schoen I-graph-wrapped package (I-WP), and Schoen face-centred cubic rhombic dodecahedron (F-RD). The finite element method was applied to determine the mechanical performance of different TPMS lattices at different relative densities inside the SPS under a three-point bending test, and the results were compared with the values calculated from analytical equations. The results showed a difference of less than 21% between the analytical and numerical results for the deformation. SP had the smallest deformation among the TPMS lattices, and F-RD can withstand the highest allowable load. Different failure modes were proposed to predict potential failure mechanisms. The results indicated that the mechanical performances of the TPMS lattices were mainly influenced by the lattice geometry and relative density.

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“…The shear stress has the largest effect on the core tearing during the three-point bending test [ 11 , 29 , 30 ]. The shear strength of ABS is taken as half of the yielding stress.…”

Section: Resultsmentioning

confidence: 99%

“…TPMSs under compressive loading and sandwich beams with a 3D truss cell/foam core under three-point bending have been studied extensively [ 29 , 30 , 31 , 32 ]. In this study, the objective was to compare the total deformation and stress distribution of SPSs containing TPMS lattice cores with different relative densities.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Strength of Triply Periodic Minimal Surface Lattices Subjected to Three-Point Bending

Lin¹,

Pan²,

Li³

2022

Polymers

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“…Energy absorption is key to testing the structural integrity in the event of failure. As shown in some articles (Jin et al 2015;Yan et al 2014;Schneider et al 2016;Sun et al 2017;Yazdani Sarvestani et al 2018;Smardzewski 2019b;Ha and Lu 2020;Farrokhabadi et al 2020), the honeycomb panels exhibit excellent energy absorption properties. The energy absorption E a (J) of the selected panels was calculated as follows: where SE a (J) is specific energy absorption, m is the mass of the energy absorber.…”

Section: Methodsmentioning

confidence: 95%

Bending and energy absorption performance of novel openwork wooden panels

2022

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In many scientific studies, beams reinforced with synthetic fiber ribbons are modeled, wood composites and materials are designed, and structures made with hollow core boards are developed. However, no research was conducted on increasing the width of the flat wooden panels by modeling an openwork structure and obtaining them from solid panels of smaller width. The research aimed to determine the impact of wood species and inclination angle of the side walls on the stiffness, strength, and ability to absorb the energy of the new openwork panel made of curvilinear wooden slats. Three-point bending tests were performed numerically and verified experimentally. It has been shown that the stiffness of the openwork panels was lower compared to solid panels. No cracks in the glue line were observed. Walnut openwork panels demonstrated the best energy absorption capacity. Therefore, it is recommended that the openwork panels be made out of walnut and beech wood, rather than ash and oak. It is also more advantageous for the panel’s construction to use the 11° inclination angle of the side walls.

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“…They demonstrated that the defects acted as potential areas for crack development and observed that the presence of imperfections in the sample might have a more beneficial impact on the toughness than on the strength as long as the distance between imperfections is short enough. Investigation of failure in the micromechanical mode will lead to a better understanding of failure at the macromechanical scale, hence to analyze the failure at the macromechanical scale in composites by examining the failure at the failure sites need to magnify and examine each model 20,21 . For this reason, general failures at the micromechanical scale should be recognized.…”

Section: Introductionmentioning

confidence: 99%

In situ strength analysis of cross‐ply composite laminates containing defects and interleaved woven layer using a computational micromechanics approach

Rafie

Madadi

Farrokhabadi

et al. 2021

Fatigue Fract Eng Mat Struct

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The transverse strength of 90° plies located in cross‐ply laminates subjected to transverse tension is investigated numerically. To reach this aim, it is assumed that the transverse cracking is formed by coalescence of fiber–matrix debonding, which propagates along the planes parallel to the fibers. The two‐dimensional finite element model (FEM) investigates the dominant micromechanical damage mechanisms, fiber–matrix debonding, and matrix cracking using the cohesive zone model (CZM) and plasticity, respectively. The numerical simulation is according to the extended computational micromechanics (ECMM) approach, which can be applied as a useful virtual test method instead of performing costly characterization tests. The results obtained from the present study show that the defects such as voids, imperfections, and residual stresses contribute to reducing the in situ strength of 90° plies. In the case of using an interleaved woven layer, the formation of the first transverse crack in unit cells within 90° layer is delayed.

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Experimental and numerical analysis of novel multi-layer sandwich panels under three point bending load

Cited by 61 publications

References 36 publications

Mechanical Strength of Triply Periodic Minimal Surface Lattices Subjected to Three-Point Bending

Mechanical Strength of Triply Periodic Minimal Surface Lattices Subjected to Three-Point Bending

Bending and energy absorption performance of novel openwork wooden panels

In situ strength analysis of cross‐ply composite laminates containing defects and interleaved woven layer using a computational micromechanics approach

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