Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Performance evaluation according to the forming method during production of bellows for LNG carriers II - Comparison of low cycle fatigue characteristics -

LNG 선박용 벨로우즈의 제작시 성형방법에 따른 성능 평가 II - 저주기 피로 특성 비교 -

  • Kim, Pyung-Su (Hanjo Co., Ltd, Engineering Center) ;
  • Kim, Jong-Do (Division of Marine Engineering, Korea Maritime and Ocean University)
  • Received : 2016.04.14
  • Accepted : 2016.07.13
  • Published : 2016.09.30
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Abstract

Static tests and low-cycle fatigue tests were conducted to analyze the characteristics of the bellows for LNG vessels according to the forming methods. The cycle life of bellows was tested based on the specified cyclic life, 80000 cycles, to analyze the difference in characteristics between pre-and post-test data by measuring the strain and stress of each convolution of formed bellows. The low-cycle fatigue test was conducted using a strain gauge that was attached to the convolution of bellows. Formed bellows were placed on the structural test device which was equipped with a hydraulic system and was capable of moving in the x-y direction. Data was measured and processed by a multi recorder. Through the static test and low-cycle fatigue tests results, the difference between the cycle life of bellows formed by mechanical methods and of those formed by hydraulic methods was investigated. Moreover, the cause of difference in cyclic life according to forming methods was performed.

LNG 선박용 성형 벨로우즈의 성형방법에 따른 특성을 파악하기 위하여 정적시험과 저주기 피로시험을 실시하였다. 벨로우즈의 규정된 수명 사이클인 8,000회를 실시하여 시험전후의 벨로우즈의 각 산에 걸리는 변형률과 응력을 측정하여 성형방법에 따른 벨로우즈간의 차이를 분석하고 산 별 응력분포를 살펴보았다. 본 저주기 피로시험은 x-y방향의 변위가 가능한 유압시스템의 구조시험장비에 성형 벨로우즈를 장착하고 벨로우즈의 각 산에는 스트레인게이지를 장착하고 멀티레코더를 통하여 데이터를 처리하였다. 이를 통하여 벨로우즈가 성형방법에 따른 수명의 차이가 있는지 살펴보았고, 성형방법에 따른 수명의 차이를 주는 원인을 분석하였다.

Keywords

References

  1. "LNG CARRIER CARGO HANDLING SYSTEM STUDIES SECTION 2:TECHNICAL SPECIFICATIONS -Section 2.2 : LINE PIPES, MAIN VALVES AND FITTINGS," NO96 PIP SPEC 2.2.2, GTT, 2010.
  2. M. Nosaka, Kenjiro, M. Suzuki, M. Kikuchi, and Y. Miyakawa, "Sealing characteristics of high speed, face-contract metal bellows mechanical seals for liquid hyudrogen," Proceedings of the JSLE International Tribology Conference, vol. 3, pp. 823-828, 1985.
  3. F. Berner, H. Oesch, H. Steinhauser, and O. Joeri, Testing of Metal Bellows and Springs in Support of the Development of a Vapor Compressor for Space Flight Application, Report No.; FO-1466;ESA-CR(P)-1230, Eidgenoessisches Flugzeugwerk, Research and Testing Dept., Emmen (Switzerland), 1979.
  4. N. Pathank, S. D. Gomale, and P. Jeboyedoff, "Fatigue life testing of metallic bellows for absolute leak tightness in solar energy application," Mechanical Engineering Bulletin, vol. 15, no. 2, pp. 38-43, 1984.
  5. D. A. Butzea, H. J. Cordewiner, C. Stickelmann, H. P. Mueller, and R. Hemminger, Manufacturing and Quality Test of the Metal Bellows of the TEXTOR Vacuum Vessel, Report No. JUEL-SPEZ-229, Zentralabteilung Allgemeine Technologie, 1983.
  6. Expansion Joint Manufacturers Association Inc., Standards of the Expansion Joint Manufacturers Association, Ninth Edition, 2009.
  7. S. K. Panda, V. H. Baltazar Hernandez, M. L. Kunts, and Y. Zhou, "Formability analysis of diode-laser-welded tailored blanks of advanced high-strength steel sheets," Journal of the Minerals, Metals&Materials Society and ASM International, vol. 40A, no. 1, pp. 1955-1967, 2009.
  8. M. J. Jeong, "The stress analysis of the U-shaped expansion joint," Annular Bulletin of Seoul Health Junior College, vol. 11, pp. 159-163, 1991.
  9. M. Radhakrishna, Kameswara, C. Rao, "Axial vibrations of U-shaped bellows with elastically restrained end conditions," Thin-Walled Structures, vol. 42, pp. 415-426, 2004. https://doi.org/10.1016/S0263-8231(03)00130-7
  10. W. I. Lee, J. E. Oh, and T. W Kim, "A study on the dynamic characteristics of bellows," Journal of the KSME, vol. 12, no. 6, pp. 1273-1281, 1988.
  11. H. Jeong, Analysis of Stiffness Deformation of U-Type Bellows Joint, M.S Thesis, Department of Mechanical Engineering, Chung-ang University, Korea, 1990 (in Korean).