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정경호 ( Kyung Ho Chung ),윤규서 ( Kyu Seo Yoon ) 한국고무학회 2010 엘라스토머 및 콤포지트 Vol.45 No.2
천연고무와 실리콘고무에 자기장응답형 분말을(Magnetic Responsible Powder; MRP) 배합하여 자기장응답형 엘라스토머(Magneto-rheological Elastomer; MRE)를 제조하였다. MRP의 최적 사용량은 30 vol.% 였으며 천연고무 기반 MRE의 기계적 물성은 실리콘고무 기반 MRE 보다 우수했지만, magneto-rheological (MR) 효과는 실리콘고무 기반 MRE가 더욱 우수하였다. MR 효과는 Self-modified Electromagnet Applied Fast Fourier Transform Analyser (SEFFTA)를 사용하여 측정되었는데 천연고무 기반 MRE의 경우는 10%, 실리콘고무 기반 MRE의 경우는 최대 35.7%까지 나타내었다. 네오디뮴 자석을 이용하여 MRE를 경화시키기 전 MRP를 선 배향 시킬 경우 더욱 우수한 MR 효과를 얻을 수 있었으며, MRP의 배향은 주사전자현미경을 이용하여 분석하였다. Magneto-rheological elastomers (MREs) were manufactured by incorporation of magnetic responsible powder (MRP) into natural rubber and silicone rubber. The optimum loading amounts of MRP was 30 vol.% and the natural rubber based MRE (NR-MRE) showed better mechanical property than that of silicone rubber based MRE (S-MRE). However, the modulus shift ratio caused by S-MRE, measured by Self-modified Electromagnet Applied Fast Fourier Transform Analyser (SEFFTA), was higher than that of NR-MRE. The modulus shift ratio caused by NR-MRE was 10%, while the modulus shift ratio caused by S-MRE was 35.7%. The modulus shift ratio could be improved by orienting the magnetic direction of MRP before crosslinking the MRE. The degree of orientation of MRP was analyzed using SEM.
인가전류 세기와 CIP 성분비에 따른 MRE의 기계적 물성 측정
오재응(Jae-Eung Oh),윤지현(Ji-Hyun Yoon),윤규서(Kyu-Seo Yoon),정경호(Kyung-Ho Chung),조현철(Hyun-Chul Cho),이성훈(Seong-Hoon Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
MRE(Magneto-rheological Elastomer) is a material which shows reversible and various modulus in magnetic field. Comparing to conventional rubber vibration isolator, MREs are able to absorb broader frequency range of vibration. These characteristic phenomena result from the orientation of magnetic particle (i.e., chain-like formation) in rubber matrix. In this study, NR was used as a matrix in order to manufacture MREs. Magnetic reactive powder(MRP), having rapid magnetic reaction, was selected as a magnetic particle to give magnetic field reactive modulus. The mechanical properties of manufactured MREs were measured without the application of magnetic field. The results showed that the tensile property and resilience were decreased while the hardness was increased with the addition of CIP. The analysis of MR effect was carried out by FFT analyzer with various magnetic flux. As the addition of MRP and magnetic flux increased, increment of MR effect was observed.