멤브레인 형 2차 방벽 이방성 복합재료의 섬유방향에 따른 기계적 성능 평가

• Published in: 大韓造船學會 論文集 Vol. 57; no. 3; pp. 168 - 174
• Main Authors: 정연제(Yeon-Jae Jeong), 김정대(Jeong-Dae Kim), 황병관(Byeong-Kwan Hwang), 김희태(Hee-Tae Kim), 오훈규(Hoon-Gyu Oh), 김용태(Yong-Tai Kim), 박성보(Seong-Bo Park), 이제명(Jae-Myung Lee)
• Format: Journal Article
• Language: Korean
• Published: 대한조선학회 2020
• Subjects: 조선공학; Cryogenic tensile test(극저온 인장실험); Coefficient of thermal expansion(열팽창 계수); Secondary Barrier(2차 방벽); Warp interlock structure(경사 인터로크 구조); Anisotropic materials(이방성 재료); 2
• ISSN: 1225-1143; 2287-7355
• DOI: 10.3744/SNAK.2020.57.3.168

Recently, the size of Liquified Natural Gas (LNG) carriers has been increasing, in turn increasing the load generated during operation. To handle this load, the thickness of LNG Cargo Containment Systems (CCSs) should be increased. Despite increasing the thickness of LNG CCSs, a secondary barrier is still used in conventional thickness. Therefore, the mechanical performance of the existing secondary barrier should be verified. In this study, tensile test of the secondary barrier was performed to evaluate mechanical properties under several low- and cryogenic-temperature conditions considering LNG environment, and in each fiber direction considering that the secondary barrier is composed of anisotropic composite materials depending on the glass fibers. Additionally, the coefficient of thermal expansion was measured by considering the degradation of the mechanical properties of the secondary barrier caused by the generated thermal stress during periodical unloading. As a result, the mechanical performance of secondary barrier in the Machine Direction (MD) was generally found to be superior than that in the Transverse Direction (TD) owing to the warp interlock structure of the glass fibers.