대한기계학회논문집A (Transactions of the Korean Society of Mechanical Engineers A)

  • 제40권5호
  • /
  • Pages.429-435
  • /
  • 2016
  • /
  • 1226-4873(pISSN)
  • /
  • 2288-5226(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
권호 표지
DOI QR코드

DOI QR Code

Cold Stretching 압력용기용 ASS304 소재의 극저온 인장 및 피로거동

Tensile and Fatigue Behavior of ASS304 for Cold Stretching Pressure Vessels at Cryogenic Temperature

  • 투고 : 2015.04.02
  • 심사 : 2016.03.28
  • 발행 : 2016.05.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

ASS304 소재로 제작된 cold stretching 압력용기는 극저온 액화천연가스의 운반 및 저장에 이용된다. Cold stretching 압력용기는 특정 수압을 이용하여 허용응력까지 기존의 압력용기를 신장시킴으로써 재료에 상당량의 소성변형이 나타난다. 이 경우, ASS304 소재의 특성에 따라 소성변형 후 항복강도가 증가하며, 신장량에 따라 두께가 감소한다. 따라서 강도 및 무게측면에서 기존의 압력용기 대비 높은 효율을 나타낸다. 본 연구에서는 ASME 코드에 의거하여 제작된 소형 cold stretching 압력용기에서 직접 채취한 시편을 이용하여 극저온 인장 및 피로특성을 평가하였다. 또한 저온피로시험으로부터 획득한 S-N 선도를 통계적으로 접근하여 P-S-N 선도를 작성하였으며, SEM 을 이용하여 파단면을 분석하였다.

Cold stretching(CS) pressure vessels from ASS304 (austenitic stainless steel 304) are used for the transportation and storage of liquefied natural gas(LNG). CS pressure vessels are manufactured by pressurizing the finished vessels to a specific pressure to produce the required stress ${\sigma}_k$. After CS, there is some degree of plastic deformation. Therefore, CS vessels have a higher strength and lighter weight compared to conventional vessels. In this study, we investigate the tensile and fatigue behavior of ASS304 sampled by CS pressure vessels in accordance with the ASME code at cryogenic temperature. From the fatigue test results, we show S-N curves using a statistical method recommended by JSEM-S002. We carried out the fractography of fractured specimens using scanning electron microscopy (SEM).

키워드

참고문헌

  1. Kim, J. H., Choi, S. W., Park, D. H. and Lee, J. M., 2014, "Cryogenic Charpy Impact Test Based on GTAW Method of AISI 304 Stainless Steel for LNG Pipe Line," Journal of Welding and Joining, Vol. 32, No. 3, pp.89-94. https://doi.org/10.5781/JWJ.2014.32.3.89
  2. AS 1210-Supple2, 1999, "Pressure Vessels-Cold Stretched Austenitic Stainless steel Vessels."
  3. ASME Section VIII Div. 1, 2013, "Cold Stretching of Austenitic Stainless Steel Pressure Vessels," Appendix. 44.
  4. Q/320582SDY7, 2008, "Pressure Strengthening of Cryogenic Vessels from Austenitic Stainless Steels-Static Vessels".
  5. Miao, C., Zheng, J., Gao, X., Huang, X., Guo, A., YE, D. and Ma, Li., 2012, "Investigation of Low-cycle Fatigue Behavior of Austenitic Stainless Steel for Cold Stretched Pressure Vessels," Appl Phys & Eng, Vol. 14, No. 1, pp. 31-37.
  6. Zheng, J., Miao, C., Xu, P., Ma, Li. and Guo, A., 2012, "Investigation on Influence Factors of Mechanical Properties of Austenitic Stainless Steel for Cold Stretched Pressure Vessels," Transaction of ASME Journal of Pressure Vessel Technology, Vol. 134, pp. 061407-1-061407-2. https://doi.org/10.1115/1.4007039
  7. Park, W. S., Kim, J. H., Chun, M. S. and Lee, J. M., 2008, "Development of Temperature and Strain-Rate Dependent Unified Constitutive Equation for Ships and Offshore Structures," Journal of the Society of Naval Architects of Korea, Vol. 48, No. 3, pp. 200-206.
  8. ISO21009-1, 2008, "Cryogenic Vessels-Static Vacuum-insulated Vessels".
  9. Tobler, R. L., Nishimura A. and Yamaoto, J., 1997, "Design-relevant Mechanical Properties of 316-type Steels for Superconducting Magnets," Cryogenics, Vol. 37, pp. 533-550. https://doi.org/10.1016/S0011-2275(97)00071-4
  10. ASTM E8M, 2004, "Standard Test Methods for Tension Testing of Metallic Material".
  11. ASTM E466, 2007, "Standard Practice for Conducting Force Controlled Constant Amplitude Axial Fatigue Tests of Metallic Materials".
  12. JSME S 002, 1994, "Standard Method of Statistical Fatigue Testing," Journal of the Japan Society of Mechanical Engineers, pp.10-42.
  13. Hong, J. H., Kuem, D. M., Han, D. S., Park, I. B., Chun, M. S., Ko, K. W. and Lee, J. M., 2008, "Mechanical Characteristics of Stainless Steel under Low Temperature Environment," Journal of Society of Naval Architects of Korea, Vol. 45, No. 5, pp. 530-537. https://doi.org/10.3744/SNAK.2008.45.5.530
  14. Kim, K. S., Boo, S. H., Park, C, Y., Cho, Y. G. and Lee, J. S., 2008, "An Experimental Study on the Tensile and Fatigue Strengths of SUS304L Lap Joint Weld at the Cryogenic Temperature," Journal of Ocean Engineering and Technology, Vol. 22, No. 3, pp. 96-102.