Original Article
  • Mechanical Performance Study of Flexible Protection Tube for Submarine Cables
  • Kyeong Soo Ahn*, Yun Jae Kim**, Jin-wook Choe***, Jinseok Lim***, Sung Woong Choi**†

  • * Hwaseung Cooperation, Defense Business Team
    ** Gyeongsang National University, Graduate School of Mechanical System Engineering
    *** Korea Electrotechnology Research Institute, Power Cable Research Center

  • 해저케이블용 유연보호튜브의 기계적 성능 연구
  • 안경수* · 김윤재** · 최진욱*** · 임진석*** · 최성웅**†

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


Demand for submarine cable is increasing due to advances in submarine power transmission technology and submarine cable manufacturing technology. Submarine cable use various types of protective equipment to prevent problems such as high maintenance costs in the event of cable damage and power outages during maintenance periods. Among them, flexible protection tube is a representative protective equipment to protect cables and respond to external forces such as waves and current. The flexible protection tube is made of polyurethane 85A hyperelastic material, so the calculation of mechanical behavior is carried out using mechanical properties based on experimental results. In this study, a study was conducted to determine the bending performance and tensile performance of flexible protection tube through analytical methods. The physical properties obtained through the multiaxial tensile test of polyurethane 85A were used for the analysis. Bending and tensile performance were determined for the maximum bending moment standard of 15 kN∙m and the tensile load standard of 50 kN. As a result, it was confirmed that when the maximum bending moment of 15 kN∙m of the flexible protection tube occurred, the bending performance of the MBR was secured at 13 m and when a tensile load of 50 kN, it was applied the maximum vertical displacement was 968 mm, confirming that the tensile performance was secured

해저케이블은 케이블의 손상 시 높은 유지 보수 비용과 문제점들을 해결하기 위해 다양한 종류의 보호기자재를 사용한다. 특히 파랑 및 해류 등의 외력 요소 들로부터 케이블을 보호하기 위해 사용되는 대표적인 보호기자재로 유연보호튜브를 들 수 있다. 유연보호튜브는 폴리우레탄 85A 초 탄성 재료로 구성되어 있어 기계적 거동을 계산하기 위해 실험 결과를 기반으로 한 물성치를 이용한다. 본 연구에서는 유연 보호 튜브를 대상으로 해석적 방법을 사용하여 휨 성능과 인장 성능을 살펴보았다. 해석에 사용된 물성치는 폴리우레탄 85A의 다축인장 실험을 통해 확보된 물성 값을 이용하였다. 유연보호튜브는 최대 굽힘 모멘트 기준치인 15 kN∙m와 인장하중의 기준치인 50 kN에 대해 휨 성능과 인장 성능을 분석하였다. 해석 결과 유연 보호 튜브의 최대 굽힘 모멘트가 15 kN∙m일 때 MBR은 13 m로 휨 성능이 확보되었으며, 인장하중이 50 kN일 때 최대 수직 변위가 968 mm를 나타내 인장 성능이 확보됨을 확인할 수 있었다

Keywords: 해저케이블(Submarine cable), 폴리우레탄(Polyurethane), 유연보호튜브(Flexible protection tube), 휨 성능 (Flexural performance), 인장 성능(Tensile performance)

This Article

Correspondence to

  • Sung Woong Choi
  • Gyeongsang National University, Mechanical System Engineering

  • E-mail: younhulje@gnu.ac.kr