Nanotechnology Conference and Trade Show - Nanotech 2006
> Program > Technical Conferences > Business & Development > Nano Impact Workshop > Nanotech Job Fair > Expo
Program
Sessions
Sunday
Monday
Tuesday
Wednesday
Thursday
Index of Authors
Index of Keywords
Confirmed Speakers
Conferences & Symposia

Conference Proceedings

Conference Technical Proceedings

Negative-Poisson’s-Ratio (NPR) Microstructural Material by Soft-Joint Mechanism

Y-W Lu, C-J Chang, P-T Lin and H-C Gea
Rutgers University, US

Keywords:
PDMS, microstructural material, compliant mechanism

Abstract:
We present an example of making a negative-coefficient material - Negative Poisson’s Ratio (NPR) material, which expands in the cross section when stretching. The NPR materials can provide unique characteristics in energy absorption. The NPR material developed here is low-cost and can sustain larger strains. The design methodology starts with a design problem and is transformed into a topology optimization problem with volume constraints. The solution is identified as a compliant mechanism with a re-entrant honeycomb structure for the maximum transverse expansion. The gray levels of the elements represent their compliance levels. The darker regions signify higher stiffness while the brighter regions signify higher compliance.
A process utilizing a soft material for the brighter elements and a rigid material for the darker elements is proposed. The rigid element made of resin-elastomer composite by using stereolithography, and the compliant element made of elastomer by using micromolding. The composite has the resin as the ‘bone’, providing the necessary rigidity, while the elastomer serves as the soft joints, bearing the deformation in the structure.
Three different material designs, including soft, rigid and bone-and-soft-joint materials, are fabricated and tested. The results verifies the fabrication of microstructural materials and the consequential design with a better NPR property in a larger strain.

Back to Program

Sessions Sunday Monday Tuesday Wednesday Thursday Authors

Nanotech 2006 Conference Program Abstract

 
Nanotechnology Conference | Terms of use | Privacy policy | Contact | NSTI Home
Program | Technical Conferences | Business & Development | Nano Impact Workshop | Nanotech Job Fair | Expo |
Nanotech 2006 Home | Press Room | Venue | Subscribe | Site Map
Names, and logos of other organizations are the property of those organizations and not of NSTI.
This event is not open to the general public and NSTI reserves the right to refuse admission and participation to any individual.