고 변형률 속도에서 폴리프로필렌 및 열가소성 올레핀 소재의 압축 거동에 대한 연구
Study of the Compressive Behavior of Polypropylene-low Glass Fiber Compound and Thermoplastic Olefin under High Strain Rate
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초록
고 변형률 속도에서 폴리프로필렌 – 유리 장섬유 복합재료 (PP-LGF) 와 열가소성 올레핀(TPO) 소재의 동적 압축 특성을 얻기 위해 홉킨슨바 (Split-Hopkinson Pressure Bar (SHPB)) 를 이용하여 실험을 진행하였다. SHPB 는 변형률 속도 100 s^-1 ~ 10000 s^-1 범위에서 재료의 동적 기계적 물성을 확인할 수 있는 장치이다. SHPB 시험은 입력봉과 전달봉에서 측정된 탄성파를 이용하여 시편의 응력, 변형률 및 변형률 속도를 얻을 수 있는 탄성파 전달 이론을 기반으로 한다. 또한 SHPB 에서 얻은 변형률 데이터의 검증을 위해 시편을 초고속카메라로 촬영하여 DIC 기법을 통해 얻은 변형률 데이터와 비교 진행하였다.
Abstract
In this study, the strain rate dependent tensile and compressive properties of PP-LGF and TPO was investigated under the high strain rate by using the Split Hopkinson Pressure Bar (SHPB). The SHPB is the most widely used apparatus to characterize dynamic mechanical behavior of materials at high strain rates between 100^-1 and 10,000^-1 . The SHPB test is based on the wave propagation theory which was developed to give the stress, strain and strain rate in the specimen using the strains measured in the incident and transmission bars. In addition, to verify the strain data obtained from SHPB, the specimen was photographed with a high-speed camera and compared with the strain data obtained through the Digital Image Correlation (DIC).
참고문헌 (6)
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