Journal of Ocean Engineering and Technology (한국해양공학회지)

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

DOI QR Code

Assessment of Cryogenic Material Properties of R-PUF Used in the CCS of an LNG Carrier

  • Song, Ha-Cheol (Department of Naval Architecture and Ocean Engineering, Mokpo National University)
  • Received : 2022.07.19
  • Accepted : 2022.08.10
  • Published : 2022.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

Reinforced polyurethane foam (R-PUF), a material for liquefied natural gas cargo containment systems, is expected to have different mechanical properties depending on its stacking position of foaming as the glass fiber reinforcement of R-PUF sinks inside R-PUF under the influence of gravity. In addition, since R-PUF is not a homogeneous material, it is also expected that the coordinate direction within this material has a great correlation with the mechanical properties. So, this study was conducted to confirm this correlation with the one between the mechanical properties and the stacking position. In particular, in this study, R-PUF of 3 different densities (130, 170, and 210 kg/m3) was used, and tensile, compression, and shear tests of this material were performed under 5 temperatures. As a result of the tests, it was confirmed that the strength and modulus of elasticity of the material increased as the temperature decreased. Specifically, the strength and modulus of elasticity in the Z direction, which was the lamination direction, tended to be lower than those in the other directions. Finally, the strength and elastic modulus of different specimens of the material found at the bottom of their lamination compared to the specimens with these properties found at positions other than their lamination bottom were evaluated. Further analysis confirmed that as the temperature decreased, hardening of R-PUF occurred, indicating that the strength and modulus of elasticity increased. On the other hand, as the density of R-PUF increased, a sharp increase in strength and elastic modulus of R-PUF was observed.

Keywords

Acknowledgement

This research was supported by the research funds of Mokpo National University in 2020.

References

  1. Ahn, J.H., Kim, J.H., Kim, J.D., Park, S.K., Park, K.H., Byun, J.S., & Lee, J.M. (2018). Development and Mechanical and Thermal Performance Evaluation of Polyurethane foam Composites Reinforced with Glass Bubbles. Journal of the Korean Society of Marine Engineering, 42(9), 708-714. http://doi.org/10.5916/jkosme.2018.42.9.708
  2. Denay, A.G., Castagnet, S., Roy, A., Alise1, G., & Thenard, N. (2013). Compression Behavior of Glass-fiber-reinforced and Pure Polyurethane Foams at Negative Temperatures Down to Cryogenic Ones. Journal of Cellular Plastics, 49(3), 209-222. https://doi.org/10.1177/0021955X13477672
  3. Jang, C.W., Shim, C.S., Song, H.C., & Song, C.Y. (2013). Study on Cryogenic Behavior of Reinforced Polyurethane Foam for Membrane Type LNG Carrier. Journal of Ocean Engineering and Technology, 27(1), 74-79. https://doi.org/10.5574/KSOE.2013.27.1.074
  4. Han, D.S., Park, I.B., Kim, M.H., Noh, B.J., Kim, W.S., & Lee, J.M. (2010). The Effects of Glass Fiber Reinforcement on the Mechanical Behavior of Polyurethane Foam. Journal of Mechanical Science and Technology, 24, 263-266. https://doi.org/10.1007/s12206-009-1136-3
  5. Kim, M.S., Kim, J.H., Kim, S.K., & Lee, J.M. (2019a). Effect of Repetitive Impacts on the Mechanical Behavior of Glass Fiber-reinforced Polyurethane Foam. Journal of Ocean Engineering and Technology 33(1), 85-91. https://doi.org/10.26748/KSOE.2018.068
  6. Kim, J.Y., Kim, J.D., & Lee, J.M. (2019b). Mechanical and Thermal Characteristics of Polyurethane Foam with Tow Different Reinforcements and the Effects of Ultrasonic Dispersion in Manufacturing. Journal of the Society of Naval Architects of Korea, 56(6), 515-522. http://doi.org/10.3744/SNAK.2019.56.6.515
  7. Lee, C.S., Kim, M.S., Park, S.B., Kim, J.H., Bang, C.S., & Lee, J.M. (2015). A Temperature- and Strain-rate-dependent Isotropic Elasto-viscoplastic Model for Glass-fiber-reinforced Polyurethane Foam. Materials and Design, 84, 163-172. https://doi.org/10.1016/j.matdes.2015.06.086
  8. Oh, J.H., Bea, J.H., & Lee, J.M. (2018). The Effects of Kevlar Pulp on Polyurethane Foam for Cryogenic Temperature. Journal of the Society of Naval Architects of Korea, 55(6), 514-520. https://doi.org/10.3744/SNAK.2018.55.6.514
  9. Park, S.B., Kim, J.H., & Lee, J.M. (2014). Comparative Study on Mechanical Behavior of Low Temperature Characteristics of Polymeric Foams for Ships and Offshore Structures. Journal of the Society of Naval Architects of Korea, 51(6), 495-502. https://doi.org/10.3744/SNAK.2014.51.6.495
  10. Park, S.B., Lee, C.S., Choi, S.W., Kim, J.H., Bang, C.S., & Lee, J.M. (2016). Polymeric Foams for Cryogenic Temperature Application: Temperature Range for Non-recovery and Brittle-fracture of Microstructure. Composite Structures, 136, 258-269. https://doi.org/10.1016/j.compstruct.2015.10.002