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Proceedings Paper

Dynamic behavior and damping capacity of auxetic foam pads
Author(s): F. Scarpa; J. A. Giacomin; A. Bezazi; W. A. Bullough
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Paper Abstract

A novel set of auxetic (negative Poisson's ratio) open cell polyurethane foam has been developed and tested under dynamic loading conditions to assess the viscoelastic response under white noise random excitation and compressive cycling. Foam pads normalized to standard ISO 13753 have been tested at room temperature and frequency bandwidth 10-500 Hz to assess transmissibility characteristics for possible antivibration glove applications. The results show that the ISO 13753 normalized transmissibility for these foams falls below 0.6 above 100 Hz, with lower peak maximum stresses under indentation compared to conventional open cell solids. These results suggest possible use of the auxetic foam for pads or linens against "white fingers" vibration applications. Further tests have been conducted on cyclic compressive loading up to 3 Hz and loading ratios of 0.95 for loading histories up to 100000 cycles. The damping capacity of the auxetic foams showed and increase by a factor 10 compared to the conventional foams used to manufacture the negative Poisson's ratio ones, and stiffness degradation stabilized after few tens on cycles.

Paper Details

Date Published: 17 March 2006
PDF: 7 pages
Proc. SPIE 6169, Smart Structures and Materials 2006: Damping and Isolation, 61690T (17 March 2006); doi: 10.1117/12.658453
Show Author Affiliations
F. Scarpa, Univ. of Bristol (United Kingdom)
J. A. Giacomin, Brunel Univ. (United Kingdom)
A. Bezazi, Univ. of Bristol (United Kingdom)
W. A. Bullough, Univ. of Sheffield (United Kingdom)

Published in SPIE Proceedings Vol. 6169:
Smart Structures and Materials 2006: Damping and Isolation
William W. Clark; Mehdi Ahmadian; Arnold Lumsdaine, Editor(s)

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