Accepted Manuscript Vibroacoustics of 2D Gradient Auxetic Hexagonal Honeycomb Sandwich Pan- els Mohammad Sadegh Mazloomi, Mostafa Ranjbar, Luca Boldrin, Fabrizio Scarpa, Sophoclis Patsias, Neriman Ozada PII: S0263-8223(17)32651-X DOI: https://doi.org/10.1016/j.compstruct.2017.10.077 Reference: COST 9052 To appear in: Composite Structures Received Date: 18 August 2017 Revised Date: 8 October 2017 Accepted Date: 23 October 2017 Please cite this article as: Mazloomi, M.S., Ranjbar, M., Boldrin, L., Scarpa, F., Patsias, S., Ozada, N., Vibroacoustics of 2D Gradient Auxetic Hexagonal Honeycomb Sandwich Panels, Composite Structures (2017), doi: https://doi.org/ 10.1016/j.compstruct.2017.10.077 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.