Volume 33 Issue 4
Jul 2019
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ZHOU Hao, LIU Shaohu, GUAN Feng. Fatigue Life Evaluation of Coiled Tube under Coupled Load of Internal Pressure, Bending and Torsion[J]. Chinese Journal of High Pressure Physics, 2019, 33(4): 044104. doi: 10.11858/gywlxb.20180611
Citation: ZHOU Hao, LIU Shaohu, GUAN Feng. Fatigue Life Evaluation of Coiled Tube under Coupled Load of Internal Pressure, Bending and Torsion[J]. Chinese Journal of High Pressure Physics, 2019, 33(4): 044104. doi: 10.11858/gywlxb.20180611

Fatigue Life Evaluation of Coiled Tube under Coupled Load of Internal Pressure, Bending and Torsion

doi: 10.11858/gywlxb.20180611
  • Received Date: 08 Aug 2018
  • Rev Recd Date: 21 Aug 2018
  • It is necessary to evaluate the fatigue life of coiled tube (CT) under the coupled load of internal pressure, bending load and torsion. First, the failure mechanism of low cycle fatigue of CT under coupling loading is analyzed. Based on Brown-Miller fatigue life model, a numerical calculation model of CT fatigue life is established. The low cycle fatigue life of CT under the coupling load of internal pressure and bending load is calculated. And also the low cycle fatigue life of CT under the load of internal pressure, bending load and torsion is calculated. The calculation results show that the maximum plastic strain and fatigue sensitive areas of CT appear on the axial tensile surface and compression surface, which is consistent with the failure of CT on oil field. The critical torque value and internal pressure of CT are obtained by calculation for CT safety service.

     

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