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High Strain Rate Compression Behavior of EPP Bumper Foams  

Choi, Ki-Sang (Structural Durability Research Center, Korea Automotive Technology Institute)
Kang, Woo-Jong (School of Mechanical & Automotive Engineering, Kyungil University)
Kim, Gi-Hoon (Structural Durability Research Center, Korea Automotive Technology Institute)
Kim, Seong-Kun (Department of Automotive Engineering, Hoseo University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.17, no.4, 2009 , pp. 118-125 More about this Journal
Abstract
Bumper is designed to protect the automotive frame without damage at low velocity. Expanded polypropylene (EPP) foam is used in the bumper as an energy absorbing material. In order to exactly predict the energy absorbing performance of the foam material under impact loading condition, it is important to use high strain rate material properties. In this study, a new apparatus for dynamic compression tests was developed to investigate the high strain rate behavior of EPP foams. Three kinds of EPP foams which have different expansion ratios were tested to investigate the quasi-static and dynamic compression behavior. Quasi-static compressions were performed at low strain rates of 0.001/s, 0.1/s and 1/s. The dynamic compressions were carried out at high strain rates of 50/s and 100/s with the developed apparatus. It was observed that the EPP foam has significant strain rate effect as compared to quasi-static behavior.
Keywords
Dynamic compression behavior; Strain rate; EPP(Expanded polypropylene);
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Times Cited By KSCI : 2  (Citation Analysis)
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