한국안전학회지 (Journal of the Korean Society of Safety)

  • 제33권6호
  • /
  • Pages.1-7
  • /
  • 2018
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  • 1738-3803(pISSN)
  • /
  • 2383-9953(eISSN)
한국안전학회 (The Korean Society of Safety)
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연속식 하역기 텐션바의 임계 균열을 고려한 잔존수명 예측 및 검사 주기 선정

Prediction of Remaining Life Time and Determination of Inspection Cycle Considering Critical Crack in Tension Bar of Continuous Ship Unloader

  • 박수 (성균관대학교 기계공학부) ;
  • 정장영 (창원대학교 기계공학과) ;
  • 송정일 (창원대학교 기계공학과) ;
  • 김대진 (안동대학교 기계공학과) ;
  • 석창성 (성균관대학교 기계공학부)
  • Park, S. (Department of Mechanical Engineering, Sungkyunkwan University) ;
  • Chung, J.Y. (Department of Mechanical Engineering, Changwon National University) ;
  • Song, J.I. (Department of Mechanical Engineering, Changwon National University) ;
  • Kim, D.J. (Department of Mechanical Engineering, Andong National University) ;
  • Seok, Chang Sung (Department of Mechanical Engineering, Sungkyunkwan University)
  • 투고 : 2018.06.20
  • 심사 : 2018.10.29
  • 발행 : 2018.12.31
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초록

The Continuous Ship Unloader (CSU) is an equipment that unloads freight from the ship docked in the port to the land. And the design target life time is designed to be 30 to 50 years, and it is classified as a semi-permanent large facility. However, cracks may occur due to structural defects, abnormal loads, and corrosion, and fatigue failure may occur before the design life is reached. In this study, we predicted the remaining life time of the main component of the CSU considering crack. And also proposed inspection cycle for maintenance of CSU based on the results of the remaining life time prediction. For this purpose, the structure, operational stresses of the CSU were analyzed and main members were selected. And tensile tests and fatigue crack propagation tests were performed with SM490YA and SM570TMC, which are used as main materials for CSU.

키워드

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Fig. 1. Continuous ship unloader(capacity : 2000 ton/hour).

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Fig. 2. Superstructure of continuous ship unloader.

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Fig. 3. Strain gage attached to tension bar member.

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Fig. 4. Dimensions of tensile test specimen.

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Fig. 5. The scene of tensile test.

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Fig. 6. Dimensions of CT specimen.

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Fig. 7. Fatigue crack propagation test and measuring of crack.

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Fig. 8. The relationship of crack length-cycle.

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Fig. 9. The relationship of da/dN-ΔK.

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Fig. 10. The relationship of allowable crack length-detection crack length.

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Fig. 11. The relationship of Remaining unloading life-detection crack length.

Table 1. Stress measurement results of tension bar when unloading one cargo ship

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Table 2. Chemical composition of materials

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Table 3. The results of tensile test

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Table 4. Conversion life time according to various detection crack length

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Table 5. Classification according to dection crack length

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Table 6. Inspection cycle according to grade

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참고문헌

  1. C. U. Kim, J. I. Song and J. Y. Chung, "Study to Improve the Bucket Life of the Continuous Ship Unloader", The Korean Society of Manufacturing Process Engineers Spring Conference, p. 29, 2017.
  2. A. Wasy, A. U. Rehman, H. S. Kim, S. H. Ha and J. I. Song, "Structural Analysis of Continuous Ship Unloader", The Korean Society of Mechanical Engineers Conference, pp. 2075-2078, 2012.
  3. G. Milana, K. Banisoleiman and A. Gonzalez, "Sources of Structural Failure in Ship Unloaders", 26th European Safety and Reliability Conference, 2016
  4. K. S. Kim, H. Ito, Y. S. Seo, B. S. Jang, B. I. Kim and Y. B. Kwon, "A Study of Crack Propagation and Fatigue Life Prediction on Welded Joints of Ship Structure (I)", Journal of the Society of Naval Architects of Korea, Vol. 44, No. 6, pp. 669-678, 2008.
  5. K. S. Kim, C. S. Shim, Y. B. Kwon, H. S. Ko, H. G. Ki and K. K. Viswanathan, "A Study of Crack Propagation and Fatigue Life Prediction on Welded Joints of Ship Structure (II)", Journal of the Society of Naval Architects of Korea, Vol. 45, No. 6, pp. 679-687, 2008. https://doi.org/10.3744/SNAK.2008.45.6.679
  6. G. Milana, K. Banisoleiman and A. Gonzalez, "Fatigue Life Assessment Method: The Case of the Ship Unloaders", 1st International Conference on Natural Hazards & Infrastructure, 2016.
  7. C. W. Hur and D. H. Moon, "A Study on Fatigue Analysis, "Reliability and Life Expectancy of a Double Link Type Level Luffing Jib Crane", J. Korean Soc. Saf., Vol. 16, No. 4, pp. 65-73, 2001.
  8. Y. F. Chang and T. Y. Wang, "The Evaluation of Fatigue Crack Propagation on a Grab Unloader", Australasian Structure Engineering Conference, pp. 146-151, 2012.
  9. ASTM E8, Standard Test Method for Tension Testing of Metallic Materials, 2016.
  10. ATM E647, Standard Test Method for Measurement of Fatigue Crack Growth Rates, 2015.
  11. S. P. Huh, C. S. Seok and W. H. Yang, "Determination of the Threshold Stress Intensity Factor in Fatigue Crack Growth Test", J. Korean Soc. Saf., Vol.15, No. 3, pp. 1-6, 2000.
  12. NI 611 SEC 12, "Guidelines for Fatigue Assessment of Steel Ship and Offshore Units", Bureau Veritas, 2016.