Journal of Mechanical Science and Technology

, Volume 32, Issue 11, pp 5055–5061 | Cite as

Effects of work hardening models on low-cycle fatigue evaluations of coiled tubing with CT-100 steel

  • Tae-Young Ryu
  • Jae-Boong Choi
  • Nam-Su HuhEmail author
  • Soo-Chang Kang
  • Ki-Seok Kim


In the present study, low-cycle fatigue life of a coiled tubing (CT) with a CT-100 steel was evaluated by using various work hardening models. Tensile and low-cycle fatigue tests were performed, and experimental results were used to calibrate material model constants. A nonlinear finite element model was constructed in the ABAQUS program by using a CT fatigue test machine. During the test cycles, bending and straightening conditions were repeated and histories of strains were collected. The multiaxial low-cycle fatigue life was calculated by using Manson–Coffin relation and Tresca criterion. The kinematic and combined hardening models can be used to evaluate the fatigue life of CT, and their results are conservative compared with the fatigue test results. Results of the present study can be used as the basic data in establishing CT fatigue analysis.


Coiled tubing Life prediction Low-cycle fatigue Work hardening model 


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Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Tae-Young Ryu
    • 1
  • Jae-Boong Choi
    • 1
  • Nam-Su Huh
    • 2
    Email author
  • Soo-Chang Kang
    • 3
  • Ki-Seok Kim
    • 3
  1. 1.School of Mechanical Engineering, Sungkyunkwan UniversityNatural Science CampusSuwonKorea
  2. 2.Department of Mechanical System and Design EngineeringSeoul National University of Science and TechnologySeoulKorea
  3. 3.Global R&D Center, POSCOIncheonKorea

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