Mid-frequency band gap performance of sandwich composites with unconventional core geometries

Ampatzidis, Theofanis; Chronopoulos, D.

Abstract

In this work novel unconventional core architectures are presented which are able to induce flexural band gaps while not being detrimental for structural bending stiffness of the sandwich structures. Two different core schemes are examined with both of them exhibiting low-frequency stop bands. While unconventional, the designs of the core offer a novel solution which can be easily manufactured in high volume parts using two-dimensional automated cutting machine. A hybrid finite element and periodic structure theory scheme is employed for the calculation of the stiffness and mass matrices, and periodic structure theory is used to obtain the wave propagation of the beams. Having acquired the wave dispersion curves and the finite element analysis' results, two specimens are manufactured using carbon fibre cured plates and commercially available PVC foam as core material. Experimental measurements of the dynamic performance of the structures are conducted using a laser vibrometer and electrodynamic shaker setup.

Citation

Ampatzidis, T., & Chronopoulos, D. (2019). Mid-frequency band gap performance of sandwich composites with unconventional core geometries. Composite Structures, 222, Article 110914. https://doi.org/10.1016/j.compstruct.2019.110914

• Journal Article Type: Article
• Acceptance Date: Apr 23, 2019
• Online Publication Date: Apr 30, 2019
• Publication Date: Aug 15, 2019
• Deposit Date: May 3, 2019
• Publicly Available Date: May 1, 2020
• Journal: Composite Structures
• Print ISSN: 0263-8223
• Electronic ISSN: 1879-1085
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 222
• Article Number: 110914
• DOI: https://doi.org/10.1016/j.compstruct.2019.110914
• Keywords: Sandwich Structure; Composite Materials; Wave Stop-Band; Wave Propagation; Wave Finite Elements Method
• Public URL: https://nottingham-repository.worktribe.com/output/2018432
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0263822318346336
• Additional Information: This article is maintained by: Elsevier; Article Title: Mid-frequency band gap performance of sandwich composites with unconventional core geometries; Journal Title: Composite Structures; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.compstruct.2019.110914; Content Type: article; Copyright: © 2019 Elsevier Ltd. All rights reserved.
• Contract Date: May 3, 2019