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      Free and forced vibration response of a laminated composite sandwich beam with dual honeycomb core: Numerical and experimental study

      1 , 1
      Polymer Composites
      Wiley

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          Abstract

          Free and forced vibration characteristics of composite sandwich beams with single‐core (SC) and dual‐core (DC) are investigated in this study. The wet hand‐layup technique is followed to make the composite face sheet, and honeycomb cores are 3D printed using the fused filament fabrication method. The natural frequencies of SC and DC sandwich beams were measured using experimental modal tests and validated through a three‐dimensional finite‐element model. Also, parametric studies on the geometry of composite structures are performed to scrutinize the effect of DC sandwich beams with different ply orientations, length‐to‐breadth ratios, core thickness, and core cell wall thickness. In addition, the transverse vibration responses of SC and DC sandwich beams are examined under harmonic force excitations at different end conditions. The study result shows that the sandwich beam's vibration behavior is enhanced by the inclusion of a core.

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          Most cited references39

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          Mechanical properties and shape memory effect of 3D-printed PLA-based porous scaffolds.

          In the present work polylactide (PLA)/15wt% hydroxyapatite (HA) porous scaffolds with pre-modeled structure were obtained by 3D-printing by fused filament fabrication. Composite filament was obtained by extrusion. Mechanical properties, structural characteristics and shape memory effect (SME) were studied. Direct heating was used for activation of SME. The average pore size and porosity of the scaffolds were 700μm and 30vol%, respectively. Dispersed particles of HA acted as nucleation centers during the ordering of PLA molecular chains and formed an additional rigid fixed phase that reduced molecular mobility, which led to a shift of the onset of recovery stress growth from 53 to 57°C. A more rapid development of stresses was observed for PLA/HA composites with the maximum recovery stress of 3.0MPa at 70°C. Ceramic particles inhibited the growth of cracks during compression-heating-compression cycles when porous PLA/HA 3D-scaffolds recovered their initial shape. Shape recovery at the last cycle was about 96%. SME during heating may have resulted in "self-healing" of scaffold by narrowing the cracks. PLA/HA 3D-scaffolds were found to withstand up to three compression-heating-compression cycles without delamination. It was shown that PLA/15%HA porous scaffolds obtained by 3D-printing with shape recovery of 98% may be used as self-fitting implant for small bone defect replacement owing to SME.
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            Review of current trends in research and applications of sandwich structures

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              • Record: found
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              • Article: not found

              Bending, buckling and free vibration of laminated composite and sandwich beams: A critical review of literature

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                Author and article information

                Contributors
                (View ORCID Profile)
                Journal
                Polymer Composites
                Polymer Composites
                Wiley
                0272-8397
                1548-0569
                August 2023
                June 15 2023
                August 2023
                : 44
                : 8
                : 5214-5231
                Affiliations
                [1 ]School of Mechanical Engineering, Vellore Institute of Technology Vellore India
                Article
                10.1002/pc.27485
                a97dcc4d-ab28-4895-80ff-f4eaaef0ae39
                © 2023

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

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