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조선용 EH40 강판의 용접부 취성 균열전파정지에 관한 연구
Study of Brittle Crack Propagation Welding for EH40 Steel Plate in Shipbuilding Steel 원문보기

한국기계가공학회지 = Journal of the Korean Society of Manufacturing Process Engineers, v.18 no.5, 2019년, pp.9 - 16  

최경신 (로이드선급) ,  이상훈 (로이드선급) ,  정원지 (창원대학교) ,  황희건 (창원대학교) ,  홍석한 (현대삼호중공업) ,  홍지웅 (현대삼호중공업)

Abstract ▼ AI-Helper 아이콘AI-Helper

Recent economic trends are worsening and becoming longer, and Korean shipbuilding is focused on high value added and high technology, especially for LNG carriers and large container ships. Both ship types increased in size in the 2010s but have requirements such as high strength, toughness at low te...

주제어

#취성 균열 정지 인성   #국제선급협회   #균열선단 열림 변위   #피로 균열   #역굽힘  

AI 본문요약
AI-Helper 아이콘 AI-Helper

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제안 방법

  • In this study, a crack-tip opening displacement (CTOD) test was performed, which is a brittle fracture test, in addition to the conventional ESSO test for a 15,100-TEU large container ship that is under construction. In addition, a welding process that combines SAW with FCAW, which has been pointed out as a cause of welding productivity degradation, was applied to improve the low-impact strength after thermal treatment and prevent fractures due to the propagation of brittle cracks, thus achieving the safety of the welded structure.
  • This study applied a welding process combining FCAW and SAW and satisfies the classification rules of EH40 BCA (Brittle Crack Arrest) steel for large container ships. The experiment results confirm the improved productivity of welding that can arrest the propagation of brittle cracks and ensure the hull structural safety of large container ships against brittle fatigue fractures.
  • This study developed a welding process that can achieve the structural safety of ships against unstable fractures of ultra-thick steel plates. The developed method can arrest brittle cracks by combining FCAW and submerged arc welding (SAW) when cracks are propagated from the weld zone along the weld line while solving the productivity degradation problem of welding, which is a disadvantage of conventional FCAW.
  • The test conditions and mechanical properties of the test in the CTOD test are outlined in Table 3. Three specimens were fabricated to apply different conditions for the ratio of the mathematical function Y to verify the reproducibility in each test.

대상 데이터

  • For the steels in this study, YP40 Steel Plate, which is an ultra-thick steel for ships, and 80-mm-thick TMCP (Thermo Mechanical Control Process) of 390 MPa class, which is a high-quality high-strength steel for ships and offshore structures, were used. They were used at locations where deformations are caused due to major torsional stress in the upper deck and hatch coaming part of the 0.
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참고문헌 (10)

  1. Handa, T., Suzuki, S., Tokura, M., Kiji, N., Nakanishi, Y., "Behavior of long brittle crack arrest in Tee joint structure of thick plate," Bulletin of the Japan Society of Naval Architects and Ocean Engineering, Vol. 4, pp. 461-462, 2007. 

  2. Honda, T., Kubo, T., Kawabata, F., Nishimura, K., Suzuki, S., Shiomi, H., Miyata, T., "Effect of Kca value on behavior of brittle crack arrest in Tee joint structure of thick plate," Bulletin of the Japan Society of Naval Architects and Ocean Engineering, Vo1. 4, pp. 459-460, 2007. 

  3. Inoue, T., Ishikawa, T., Imai, s., Koseki, T., Hirota, K., Yamaguchi, Y., Matsumoto, Y., Yajuma, H., "Long crack arrest concept in heavy-thick shipbuilding steels," Pro-ceedings of International Offshore and Polar Engineering Conference, pp. 3322, 2007. 

  4. Robertson, T. S., "Propagation of brittle fracture in steel," Journal of the Iron and Steel Institute, Vol. 175, pp. 361-374, 1953. 

  5. Yamaguchi, Y., Yajima, H., Aihara, S., Yoshinari, H., Hirota, K., Toyoda, M., Kiyosue, T., Tanaka, S., Okabe, S., Kageyama, K., Funatsu, Y., Handa, T., Kawabata, T., Tani, T., "Development of guidelines on brittle crack arrest design-Brittle crack arrest design for large container ships-1," International Society of Offshore and Polar Engineers, pp. 20-25, 2010. 

  6. Inoue, T., Ishikawa, T., Imai, S., koseki, T., Hirota, K., Tada, M., Kitada, H., Yamaguchi, Y., Yajima, H., "Long crack arrestability of heavy-thick shipbuilding steels," International Society of Offshore and Polar Engineers, Vol. 16, 2006. 

  7. An, G. B., "Unstable Fracture Preventive Design in Large Vessels and Offshore Structures," International Journal of Offshore and Polar Engineering, Vol. 25, No. 3, 2015. 

    상세보기

  8. An, G. B., Han, I. W., Park, J. U., Woo, W. C., "A Basic Study on Brittle Crack Propagation Path with Ultra Large Steel Plate Weld Joints," Journal of Welding and Joining, Vol. 35, No. 6, pp. 15-20, 2017. 

  9. Jeong, S. H., Park, D. H., Kim, H. S., Shin, S. B., Park, T. J., "A Study on Reduction of Pre-Crack Deviation in CTOD Specimen Using Reverse Bending Method", Journal of Welding and Joining, Vol. 33 No. 2, pp. 62-68, 2015. 

  10. James, G., William, T., Yong-Yi Wang, Y. Y., Bowker, J., Park, D. Y., Guowu, S., "Mechanical properties and microstructure of weld metal and HAZ regions in X100 single and dual torch girth welds," 2010 8th International Pipeline Conference, Vol. 2, pp. 619-629, 2010. 

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