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AN IMPROVEMENT IN SHOCK ABSORBING BEHAVIOR OF POLYURETHANE FOAM WITH A NEGATIVE POISSON EFFECT

Authors
 K.O. Park  ;  Jae Bong Choi  ;  Jeong Koo Kim  ;  D.J. Park  ;  Jong Chul Park 
Citation
 Key Engineering Materials, Vol.342~343 : 845-848, 2007 
Journal Title
 Key Engineering Materials 
ISSN
 1013-9826 
Issue Date
2007
Abstract
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.
Full Text
http://www.scientific.net/KEM.342-343.845
DOI
10.4028/www.scientific.net/KEM.342-343.845
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Medical Engineering (의학공학교실) > 1. Journal Papers
Yonsei Authors
Park, Jong Chul(박종철) ORCID logo https://orcid.org/0000-0003-0083-5991
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/96786
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