Sanami, M, Alderson, A, Alderson, KL et al. (3 more authors) (2014) The production and characterization of topologically and mechanically gradient open-cell thermoplastic foams. Smart Materials and Structures, 23 (5). 055016. ISSN 0964-1726
Abstract
The development of longitudinally and radially gradient open-cell polyurethane foams is reported. Local and global mechanical properties and pore structure have been characterized using video extensometry with x−y strain-mapping capability, and x-ray microtomography (CT) and scanning electron microscopy (SEM), respectively. The local axial Poisson's ratio varies in a smoothly continuous manner along the length of the longitudinally gradient foam from large negative (auxetic), through zero, to positive (conventional) values. The production of radially gradient foams having a coaxial core–sheath structure is reported for the first time. Two radially gradient foams have been produced, each displaying similar global negative axial Poisson's ratio responses but with markedly different local axial Poisson's ratio and local axial Young's modulus behaviours. One of the radially gradient foams displays a positive Poisson's ratio core and an auxetic sheath resulting from conventional and higher density re-entrant open-cell pore structures, respectively.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Keywords: | negative Poisson’s ratio, auxetic, piezomorphic, polyurethane foam, morphing material, x-ray microtomography, gradient foam |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Functional Surfaces (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 07 Jun 2016 14:12 |
Last Modified: | 07 Jun 2016 14:12 |
Published Version: | http://dx.doi.org/10.1088/0964-1726/23/5/055016 |
Status: | Published |
Publisher: | IOP Publishing |
Identification Number: | 10.1088/0964-1726/23/5/055016 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:92328 |