Vol. 1, No. 4, 2006

Download this article
Download this article For screen
For printing
Recent Issues

Volume 14
Issue 5, 601–619
(in progress)


Issue 3, 309–448
Issue 2, 193–308
Issue 1, 1–191

Volume 13, 5 issues

Volume 12, 5 issues

Volume 11, 5 issues

Volume 10, 5 issues

Volume 9, 5 issues

Volume 8, 8 issues

Volume 7, 10 issues

Volume 6, 9 issues

Volume 5, 6 issues

Volume 4, 10 issues

Volume 3, 10 issues

Volume 2, 10 issues

Volume 1, 8 issues

The Journal
About the Journal
Editorial Board
Subscriptions
Scientific Advantage
Submission Guidelines
Submission Form
Ethics Statement
ISSN: 1559-3959
Author Index
To Appear
 
Other MSP Journals
Measuring impact responses of foamed polymers

James F. Wilson

Vol. 1 (2006), No. 4, 725–741
Abstract

A unique dual pendulum system was developed to measure single-impact compression responses of foamed polymers. The data, complemented with a mathematical model of impact, led to measures of the material’s energy absorption, compression modulus, and damping. Results are presented for a class of open-celled foamed polymers specifically developed for shock mitigation. The experiments employed such materials of four different densities, with impact times ranging in the 1 to 5 ms range and mean impact stresses up to 160 kN/m2. The results for these materials showed: (1) energy losses of up to 50% of incident energy, with a peak energy absorption per unit volume of 18 kJ/m3; (2) peak compression modulus of 880 kN/m2 with strain rates approaching 200 s1; (3) a mean damping factor of 0.258 with a standard deviation of 0.029. Such data are of practical importance in many shock-mitigating applications, including prostheses, floor pads and cushions, gloves for hand-held vibrating tools, grips for hockey sticks and tennis rackets, and soles for sports shoes.

Keywords
foamed polymers, impact response
Milestones
Received: 11 December 2005
Revised: 17 February 2006
Accepted: 5 March 2006
Published: 1 August 2006
Authors
James F. Wilson
Pratt School of Engineering
Duke University
6319 Mimosa Drive
Chapel Hill, NC 27514
United States