Fabrication, characterisation and analytical modelling of gradient auxetic closed cell foams
| Autor: | Tom Allen, Andrew Alderson, Oliver Duncan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Fabrication Auxetics Modulus 02 engineering and technology 01 natural sciences 0103 physical sciences Impact energy absorption General Materials Science cardiovascular diseases Electrical and Electronic Engineering Composite material Anisotropy Civil and Structural Engineering 010302 applied physics technology industry and agriculture 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics Mechanics of Materials Signal Processing Closed cell Open cell Cell structure lipids (amino acids peptides and proteins) 0210 nano-technology |
| ISSN: | 0964-1726 |
| Popis: | Auxetic (negative Poisson’s ratio) and gradient open cell foams have shown promise for their conformability and high impact energy absorption—useful in applications like protective equipment, footwear and prosthetics. Recent methods fabricated auxetic closed cell foam by steaming conventional closed cell foam. Methods developed herein control the cell structure of auxetic closed cell foam, to produce novel intentionally anisotropic and gradient auxetic closed cell foam. Pins passed through the foam constrained or stretched regions during steaming to further modify cell structure, and impart gradients in cell structure, Young’s modulus and Poisson’s ratios. Fabricated foams had Poisson’s ratios between 1 and −1. Imparted Young’s moduli of 1–12 MPa were similar to foams used in footwear, prosthesis, helmets and other impact protection. The effect of changes to cell structure on Young’s moduli and Poisson’s ratio are explained by combining analytical models of auxetic open cell and conventional closed cell foam. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|