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      Vibrational behavior of a 3D printed biomimetic dual‐core composite sandwich beam: An experimental and numerical study

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      Polymer Composites
      Wiley

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          Abstract

          Composite sandwich structures have been used in various applications like aerospace, automotive, and maritime sectors. The process of identifying the core design and the selection of a prominent core is crucially important in sandwich structures. In this study, biomimetic core development and vibration responses of composite sandwich beams with a dual biomimetic honeycomb core are investigated. The composite face layers are fabricated by the hand lay‐up method, and the fused deposition modeling is used to 3D print the PLA honeycomb cores. Based on ASTM‐E1876 and the alternative dynamic approach, the face layer elastic properties and rigidity modulus of the cores are evaluated, respectively. The numerical simulation is used to predict the sandwich panels' natural frequencies and mode shapes and verified with experimental results. There was an excellent agreement between the calculated and experimental natural frequencies. Due to the presence of the core and enhanced rigidity modulus, the dual lamellar honeycomb core sandwich beam produces the highest natural frequencies among all‐composite sandwich beams, followed by the dual regular honeycomb, single lamellar honeycomb, and single regular honeycomb cores. The geometric parametric studies, including core thickness, length‐to‐breadth ratio, lamination schemes, support conditions, and transverse vibration responses were also analyzed for different sandwich patterns. As a result of this work, thick composite sandwich panels in aeronautical and marine structures can be replaced with dual biomimetic core structures. The study highlights the fact that the dual‐core sandwich beam provided greater modal frequency than the single‐core beam with the same weight proportions.

          Highlights

          • Pistachio nut shell‐based biomimetic honeycomb core has been developed.

          • Alternative dynamic approach is used to find sandwich‐core shear properties.

          • Lamellar‐infused biomimetic model yields higher shear modulus and stiffness.

          • Dual‐core beam having high flexural stiffness enhances the natural frequency.

          • Various parametric studies were analyzed for different sandwich patterns.

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          Most cited references51

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          Bioinspired engineering of honeycomb structure – Using nature to inspire human innovation

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            Is Open Access

            Preparing two-dimensional microporous carbon from Pistachio nutshell with high areal capacitance as supercapacitor materials

            Two-dimensional (2D) porous carbon AC-SPN-3 possessing of amazing high micropore volume ratio of 83% and large surface area of about 1069 m2 g−1 is high-yield obtained by pyrolysis of natural waste Pistachio nutshells with KOH activation. The AC-SPN-3 has a curved 2D lamellar morphology with the thickness of each slice about 200 nm. The porous carbon is consists of highly interconnected uniform pores with the median pore diameter of about 0.76 nm, which could potentially improve the performance by maximizing the electrode surface area accessible to the typical electrolyte ions (such as TEA+, diameter = ~0.68 nm). Electrochemical analyses show that AC-SPN-3 has significantly large areal capacitance of 29.3/20.1 μF cm−2 and high energy density of 10/39 Wh kg−1 at power of 52/286 kW kg−1 in 6 M KOH aqueous electrolyte and 1 M TEABF4 in EC-DEC (1:1) organic electrolyte system, respectively.
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              The effect of resin uptake on the flexural properties of compression molded sandwich composites

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                Author and article information

                Contributors
                (View ORCID Profile)
                Journal
                Polymer Composites
                Polymer Composites
                Wiley
                0272-8397
                1548-0569
                January 20 2024
                October 12 2023
                January 20 2024
                : 45
                : 2
                : 1178-1194
                Affiliations
                [1 ] School of Mechanical Engineering Vellore Institute of Technology Vellore India
                Article
                10.1002/pc.27844
                f92567dd-6167-4271-8d7c-744ffec38ff9
                © 2024

                http://onlinelibrary.wiley.com/termsAndConditions#vor

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