지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 강우종
- 발행연도
- 2016
- 저작권
- 경일대학교 논문은 저작권에 의해 보호받습니다.
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초록· 키워드
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PU Foam, which is used in LNG carrier as an insulation and cushioning material is composed of polyol and isocyanate. The material behavior must be known in order to design a LNG carrier without any damage under sloshing conditions. Since the sloshing causes a very strong impulse loading condition on the LNG carrier, the high strain rate behavior and local damage of the foam material must be verified.
The purpose of this study is to verify the high strain rate behavior of PU foam material and also investigate the local damage of the material. Three sizes of specimens, 25mm, 50mm, 100mm, were compared under dynamic loading conditions. The strain rate obtained in the compression tests were 0.001/s - 100/s. In order to investigate the local strain distribution, several strain measuring techniques were compared such as a grid method and a digital image correlation(DIC) method. High strain rate behavior under cryogenic condition was also investigated.
Several patterns were compared to measure strains with DIC under impact compression loading conditions and a stable pattern making condition was found. The PU foam showed a high strain rate hardening effect and inhomogeneous strain distribution. The modified stress-strain curve considering the local strain distribution can be obtained from the tests and strain analyzation methods.
The purpose of this study is to verify the high strain rate behavior of PU foam material and also investigate the local damage of the material. Three sizes of specimens, 25mm, 50mm, 100mm, were compared under dynamic loading conditions. The strain rate obtained in the compression tests were 0.001/s - 100/s. In order to investigate the local strain distribution, several strain measuring techniques were compared such as a grid method and a digital image correlation(DIC) method. High strain rate behavior under cryogenic condition was also investigated.
Several patterns were compared to measure strains with DIC under impact compression loading conditions and a stable pattern making condition was found. The PU foam showed a high strain rate hardening effect and inhomogeneous strain distribution. The modified stress-strain curve considering the local strain distribution can be obtained from the tests and strain analyzation methods.
목차
목 차그림 목차1. 서론1.1 연구 배경1.2 연구 목적2. 정적 및 고속 압축시험2.1 시험 방법2.2 정적 압축시험2.3 고속 압축시험2.4 극저온 시험2.5 국부 변형률 측정2.5.1 Loading-Unloading-Reloading2.5.2 격자 분석2.6 Digital Image Correlation3. 실험결과 및 고찰4. 결론5. 참고 문헌
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