An Improvement in Shock Absorbing Behavior of Polyurethane Foam with a Negative Poisson Effect

Abstract:

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Polyurethane foam was fabricated by ‘two-component method’ for changing cell structures. Compression force applied immediately to the polyurethane foam just after complete foam formation at the top of the mold for generation cell structure of negative Poisson effect. That is what we called pressure-controlled method. The polyurethane foam, produced by pressurecontrol method (CT), has significant higher resilience (52.3%) and similar level of shock absorption (47.5%) compared with control polyurethane foam (resilience is 21.5%, shock absorption is 54%). The PU foam with negative Poisson’s ratio showed excellent resilience with shock absorbance. The pressure-control method divided into two parts (CT0, CT1). The CT1 method is to apply compression force to the foam with time-delayed after foam formation. The PU foam produced by CT1 showed lower stress relaxation time, stress relaxation ratio, and maximum stress than CT0. Hence, CT1 foam is superior to other polyurethane foam as shock absorbing materials, such as shoes for diabetic patients.

Info:

Periodical:

Key Engineering Materials (Volumes 342-343)

Edited by:

Young-Ha Kim, Chong-Su Cho, Inn-Kyu Kang, Suk Young Kim and Oh Hyeong Kwon

Pages:

845-848

DOI:

10.4028/www.scientific.net/KEM.342-343.845

Citation:

K.O. Park et al., "An Improvement in Shock Absorbing Behavior of Polyurethane Foam with a Negative Poisson Effect", Key Engineering Materials, Vols. 342-343, pp. 845-848, 2007

Online since:

July 2007

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Price:

$35.00

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