Effects of Periodic Sequential Arrangement of Subscale Miura-Foldcore Under Quasi-Static Compression
Document Type
Article
Author ORCID Identifier
Juhyeong Lee https://orcid.org/0000-0001-9383-3869
Journal/Book Title/Conference
Journal of Composite Materials
Publisher
Sage Publications Ltd.
Publication Date
6-4-2024
Journal Article Version
Accepted Manuscript
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial 4.0 License
First Page
1
Last Page
37
Abstract
This study presents experimental and numerical investigations on the quasi-static compressive responses of various subscale Miura-foldcore composites. A series of quasi-static compression tests were conducted on standard Miura foldcore specimens fabricated using carbon/epoxy woven fabric prepregs. Representative volume element (RVE) models, incorporating periodic boundary conditions (PBCs), were developed to predict the size-dependent compressive response of subscale Miura foldcores. The effective properties of the carbon/epoxy woven fabric composite used in this study were calculated using the NASA multiscale analysis tool (NASMAT) via two-step homogenization process. The FE model exhibited comparable agreement with experimental results, showcasing variations of less than 7% and 12% in maximum compressive load and compressive stiffness, respectively. The implementation of PBC in the foldcore RVE models improved modeling accuracy by < 4%, but drastically increased total computational time ( >50%). The periodic pattern of foldcore unit-cells, where two single foldcore unit-cells were placed in parallel or perpendicular, imposed geometric constraints, resulting in small variations in predicted stress and strain distribution contours. The key findings highlighted in this study suggest that a 1×1 foldcore unit-cell model without PBC is sufficient to predict accurate quasi-static compressive responses of foldcore composites. This study advances the understanding of subscale Miura-foldcore composites and provides valuable insights into the limitations associated with the use of PBC in foldcore RVE models. The findings also offer a 2 practical guide for fabricating and analyzing traditional Miura folding patterns, promoting a more efficient and accurate approach for optimizing foldcore composite designs considering both structural performance and manufacturability.
Recommended Citation
Mortensen, C., Nielsen, D., Shah, S.Z.H., and Lee, J. (2024), “Effects of Periodic Sequential Arrangement of Subscale Miura-foldcore Under Quasi-Static Compression,” Journal of Composite Materials.
