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Evaluation of Structural Safety of Polyethylene Boats by Drop Test Method

낙하시험에 의한 폴리에틸렌 보트의 구조 안전성 평가

  • Lee, Sung-Riong (Dept. of Materials and Metallurgical Engineering, Kangwon Nat'l Univ.) ;
  • Kang, Gyung-Ju (Dept. of Mechanical Design Engineering, Kangwon Nat'l Univ.) ;
  • Cho, Seok-Swoo (Dept. of Mechanical Design Engineering, Kangwon Nat'l Univ.)
  • 이성룡 (강원대학교 금속재료공학과) ;
  • 강경주 (강원대학교 기계설계공학과) ;
  • 조석수 (강원대학교 기계설계공학과)
  • Received : 2017.03.08
  • Accepted : 2017.05.12
  • Published : 2017.05.31

Abstract

The structural safety of small craft, such as steel ships and FRP ships, can be estimated using the measurement test of the hull plate thickness or the longitudinal bending strength test. A polyethylene boat is made using inexpensive HDPE and can be mass produced. The structural safety of a polyethylene boat cannot be guaranteed because a polyethylene boat hull is notspecified in the KR technical rules. The inspection procedure of sailing yachts and pleasure boats and drop test method of ISO standard 12215-5 propose the structural strength required for small crafts as the drop test height. Therefore, in this study, the drop test of a polyethylene boat hull was carried out based on the inspection procedure of a sailing yacht and pleasure boat and the drop test method of ISO standard 12215-5. The drop load was acquired by the drop acceleration ofa boat hull. Structural analysis and safety of a polyethylene boat were performed by the drop load and allowable stress criteria. The calculation results of the hull plate thickness by structural design specification of ISO standard 12215-5 showed that polyethylene boat hull was more than two times thicker than a steel ship hull and the boat hull determined by the inspection procedure of sailing yacht and pleasure boat and drop test method of ISO standard 12215-5 was more than 1.2 times thicker than the boat hull determined by structural design specification of ISO standard 12215-5. Therefore, inspection procedure of sailing yachts and pleasure boats and drop test method of ISO standard 12215-5 was much more conservative than the structural design specification of ISO standard 12215-5 and could be used as the structural design method of a polyethylene boat.

Keywords

Drop Test;Inspection procedure of sailing yacht and pleasure boat;ISO standard 12215-5;Polyethylene Boat;Structural Strength

Acknowledgement

Supported by : 강원대학교

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