International Journal of Ocean System Engineering

Korean Society of Ocean Engineers (한국해양공학회)
권호 표지
DOI QR코드

DOI QR Code

Damping Effect of Reinforced Polyurethane Foam under Various Temperatures

  • Lee, Tak-Kee (Dept. of Naval Archi. and Ocean Eng., Marine Industry Institute, Gyeongsang National University) ;
  • Kim, Myung-Hyun (Dept. of Naval Archi. and Ocean Eng., Pusan National University) ;
  • Rim, Chae-Whan (Korea Institute of Machinery & Materials) ;
  • Chun, Min-Sung (Samung Heavy Industries, Co., Ltd.) ;
  • Suh, Yong-Suk (Samung Heavy Industries, Co., Ltd.)
  • Received : 2011.09.18
  • Accepted : 2011.11.15
  • Published : 2011.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

Reinforced polyurethane foam (RPUF) is one of the important materials of Mark III type insulation systems used in liquefied natural gas (LNG) cargo containment systems. However, RPUF is the most difficult material to use with regard to its safety assessment, because there is little public and reliable data on its mechanical properties, and even some public data show relatively large differences. In this study, to investigate the structural response of the system under compressive loads such as sloshing action, time-dependent characteristics of RPUF were examined. A series of compressive load tests of the insulation system including RPUF under various temperature conditions was carried out using specimens with rectangular section. As a result, the relationship between deformation of RPUF and time is linear and dependent on the loading rate, so the concept of strain rate could be applied to the analysis of the insulation system. Also, we found that the spring constant tends to converge to a value as the loading rate increases and that the convergence level is dependent on temperature.

Keywords

References

  1. K.S. Lee and H.K. Jang, Introduction of LNG carrier, J. of the Korean Society of Marine Engineering, 29 (4) (2005) 341-348.
  2. J.S. Kim, Overview of LNG market and LNG offshore terminal, J. of the Society of Naval Architects of Korea, 41 (2) (2005) 94-99.
  3. Korea Gas Corporation, Development for Insulation System and Main Elements of LNG Cargo Containment System, (2007).
  4. B.J. Noh, Sloshing Load Analysis in Spherical Tank of LNG Carrier, Special Issue of the Society of Naval Architects of Korea, (2005) 22-30.
  5. J.J. Park, M.S. Kim, Y.B. Kim and M.K. Ha, Numerical Sloshing Analysis of LNG Carriers in Irregular Waves, Special Issue of the Society of Naval Architects of Korea, (2005) 38-43.
  6. J.H. Lee, W.C. Choi, M.H. Kim, W.S. Kim, B.J. Noh, I.H. Choi and J.M. Lee, Experimental Assessment of Dynamic Strength of Membrane Type LNG Carrier Insulation System, J. of the Society of Naval Architects of Korea, 44 (3) (2007) 296-304. https://doi.org/10.3744/SNAK.2007.44.3.296
  7. T.K. Lee, M.S. Chun, C.W. Rim and Y.S. Suh, An Experimental Study on Time-dependent Characteristics of Polyurethane Foam, The 22nd Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM 2008), Istanbul, Turkey (2008), 360-365.
  8. C.S. Bang, M.K. Ha, J.N. Lee, J.H. Bae, Y.T. Kang and M.J. Koo, Drop Test for LNG Cargo Containment System, Proc. of the Annual Spring Meeting, Society of Naval Architects of Korea, Chungmu, Korea (2004) 101-106.
  9. J.H. Lee, An Experimental and Numerical Study of LNGC Sloshing Load, Master Thesis, Pusan National University, (2006).
  10. S.K. Nam, W.S. Kim, B.J. Noh, H.C. Shin and I.H. Choi, The Parametric Study on the Response of Membrane Tanks in an Mark III Type LNG Carrier Using Coupled Hydro-Elastic Model, Proc. of Int. Conf. of Design, Construction & Operation of Natural Gas Carriers & Offshore Systems (ICSOT 2006) Busan, Korea, (2006) 147-154.
  11. J.M. Lee, J.K. Paik, M.H. Kim, W.S. Kim, B.J. Noh and I.H. Choi, Dynamic Strength Characteristics of Membrane Type LNG Cargo Containment System, Proc. of Int. Conf. of Design, Construction & Operation of Natural Gas Carriers & Offshore Systems (ICSOT 2006) Busan, Korea, (2006) 189-200..
  12. M.S. Chun, J.H. Lee and J.M. Lee, A Study on the Characteristics of the Impact Responses of the LNG Insulation System, Proc. of the Annual Autumn Meeting of the Society of Naval Architects of Korea, Jeju, Korea, (2007) 227-233.