| 제목 |
변형률 속도에 따른 EPP Foam의 대변형 동적 압축 특성에 관한 연구 |
| 분야 |
차체 및 구조 안전 |
| 언어 |
Korean |
| 저자 |
최기상(자동차부품연구원), 김기훈(자동차부품연구원), 강우종(경일대학교), 김성근(호서대학교) |
| Key Words |
Dynamic compression behavior(동적거동), Strain rate(변형률속도), EPP(Expanded polypropylene) |
| 초록 |
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. |
| 원문(PDF) |
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