Invesitigation of mechanical behaviour of auxetic core sandwich composite panels produced by 3D printing

Emre Demir; Ayşe Bedeloğlu

doi:10.61112/jiens.1787646

Invesitigation of mechanical behaviour of auxetic core sandwich composite panels produced by 3D printing

Abstract

In this study, the effect of auxetic core structures with a negative Poisson's ratio on the mechanical performance of sandwich composites was systematically investigated using additive manufacturing (AM). Compared to conventional honeycomb structures with a positive Poisson's ratio, three different core configurations (re-entrant and improved re-entrant) were fabricated from polylactic acid (PLA) using the fused deposition modeling (FDM) technique. These core structures were then bonded with carbon fiber-reinforced epoxy surface layers to form sandwich composite panels. Tensile, three-point bending, and compression tests were conducted in accordance with ASTM standards, and Poisson ratios were determined experimentally. The results were then comparatively evaluated using finite element analyses (FEA). The results revealed that the cores with a negative Poisson's ratio significantly improved the mechanical performance of the sandwich composites. Among the tested designs, the improved re-entrant geometry achieved the highest strength values, reaching 160.83 MPa in the flexural test and 125 MPa in the compression test. These findings demonstrate that auxetic geometry design has the potential to improve the comparative mechanical performance of sandwich composites.

Keywords

References

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Details

Primary Language

English

Subjects

Polymer Technologies, Polymers and Plastics

Journal Section

Research Article

Authors

Emre Demir
0000-0002-4079-4218
Türkiye

Ayşe Bedeloğlu ^*
0000-0003-2960-5188
Türkiye

Publication Date

July 30, 2026

Submission Date

September 21, 2025

Acceptance Date

May 13, 2026

Published in Issue

Year 2026 Volume: 6 Number: 2

DOI

https://doi.org/10.61112/jiens.1787646

IZ

https://izlik.org/JA72RK74LK

Cite

RIS / Bibtex

APA

Demir, E., & Bedeloğlu, A. (2026). Invesitigation of mechanical behaviour of auxetic core sandwich composite panels produced by 3D printing. Journal of Innovative Engineering and Natural Science, 6(2), 339-351. https://doi.org/10.61112/jiens.1787646

AMA

1.Demir E, Bedeloğlu A. Invesitigation of mechanical behaviour of auxetic core sandwich composite panels produced by 3D printing. JIENS. 2026;6(2):339-351. doi:10.61112/jiens.1787646

Chicago

Demir, Emre, and Ayşe Bedeloğlu. 2026. “Invesitigation of Mechanical Behaviour of Auxetic Core Sandwich Composite Panels Produced by 3D Printing”. Journal of Innovative Engineering and Natural Science 6 (2): 339-51. https://doi.org/10.61112/jiens.1787646.

EndNote

Demir E, Bedeloğlu A (July 1, 2026) Invesitigation of mechanical behaviour of auxetic core sandwich composite panels produced by 3D printing. Journal of Innovative Engineering and Natural Science 6 2 339–351.

IEEE

[1]E. Demir and A. Bedeloğlu, “Invesitigation of mechanical behaviour of auxetic core sandwich composite panels produced by 3D printing”, JIENS, vol. 6, no. 2, pp. 339–351, July 2026, doi: 10.61112/jiens.1787646.

ISNAD

Demir, Emre - Bedeloğlu, Ayşe. “Invesitigation of Mechanical Behaviour of Auxetic Core Sandwich Composite Panels Produced by 3D Printing”. Journal of Innovative Engineering and Natural Science 6/2 (July 1, 2026): 339-351. https://doi.org/10.61112/jiens.1787646.

JAMA

1.Demir E, Bedeloğlu A. Invesitigation of mechanical behaviour of auxetic core sandwich composite panels produced by 3D printing. JIENS. 2026;6:339–351.

MLA

Demir, Emre, and Ayşe Bedeloğlu. “Invesitigation of Mechanical Behaviour of Auxetic Core Sandwich Composite Panels Produced by 3D Printing”. Journal of Innovative Engineering and Natural Science, vol. 6, no. 2, July 2026, pp. 339-51, doi:10.61112/jiens.1787646.

Vancouver

1.Emre Demir, Ayşe Bedeloğlu. Invesitigation of mechanical behaviour of auxetic core sandwich composite panels produced by 3D printing. JIENS. 2026 Jul. 1;6(2):339-51. doi:10.61112/jiens.1787646