Fatigue of threaded tension leg platform tethers

F. P. Brennan, W. D. Dover

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

3 Citations (Scopus)

Abstract

This paper describes the development and implementation of a typical variable amplitude load sequence on tethers for a tension leg platform. The dynamic response of the Hutton TLP was considered in defining a suitable tether tension response spectrum. This spectrum was then used to generate a time series to give a similar amplitude-frequency distribution. Two full scale variable amplitude fatigue tests on large diameter threaded connections are reported using the simulated load sequence. The fatigue test results are compared with constant amplitude results from a previous study on similar connections. A hybrid electric analogue-finite element technique was used to determine the local stress at the critically loaded tooth from which all failures were initiated. Fracture mechanics analysis of the critical cracks was conducted using a recently developed generic weight function solution for threaded connections. Crack aspect ratio was also considered together with previous related studies. In all, the paper presents useful fatigue crack growth data and analysis of threaded tether connections under realistic simulated service loading.

Original languageEnglish
Title of host publicationProceedings of the International Offshore and Polar Engineering Conference
Pages91-97
Number of pages7
Volume1
Publication statusPublished - 1 Jan 1994
EventProceedings of the 4th International Offshore and Polar Engineering Conference. Part 1 (of 4) - Osaka, Jpn
Duration: 10 Apr 199415 Apr 1994

Conference

ConferenceProceedings of the 4th International Offshore and Polar Engineering Conference. Part 1 (of 4)
CityOsaka, Jpn
Period10/04/9415/04/94

Fingerprint

Tension-leg platforms
Fatigue of materials
Cracks
Fatigue crack propagation
Fracture mechanics
Dynamic response
Aspect ratio
Time series

Keywords

  • crack propagation
  • degrees of freedom (mechanics)
  • dynamic response
  • fatigue of materials
  • fatigue testing
  • finite element method
  • fracture mechanics
  • loads (forces)
  • mooring cables
  • offshore structures
  • spectrum analysis
  • structural analysis
  • crack aspect ratio
  • tension buoyant platform
  • tension leg platform

Cite this

Brennan, F. P., & Dover, W. D. (1994). Fatigue of threaded tension leg platform tethers. In Proceedings of the International Offshore and Polar Engineering Conference (Vol. 1, pp. 91-97)
Brennan, F. P. ; Dover, W. D. / Fatigue of threaded tension leg platform tethers. Proceedings of the International Offshore and Polar Engineering Conference. Vol. 1 1994. pp. 91-97
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abstract = "This paper describes the development and implementation of a typical variable amplitude load sequence on tethers for a tension leg platform. The dynamic response of the Hutton TLP was considered in defining a suitable tether tension response spectrum. This spectrum was then used to generate a time series to give a similar amplitude-frequency distribution. Two full scale variable amplitude fatigue tests on large diameter threaded connections are reported using the simulated load sequence. The fatigue test results are compared with constant amplitude results from a previous study on similar connections. A hybrid electric analogue-finite element technique was used to determine the local stress at the critically loaded tooth from which all failures were initiated. Fracture mechanics analysis of the critical cracks was conducted using a recently developed generic weight function solution for threaded connections. Crack aspect ratio was also considered together with previous related studies. In all, the paper presents useful fatigue crack growth data and analysis of threaded tether connections under realistic simulated service loading.",
keywords = "crack propagation, degrees of freedom (mechanics), dynamic response, fatigue of materials, fatigue testing, finite element method, fracture mechanics, loads (forces), mooring cables, offshore structures, spectrum analysis, structural analysis, crack aspect ratio, tension buoyant platform, tension leg platform",
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Brennan, FP & Dover, WD 1994, Fatigue of threaded tension leg platform tethers. in Proceedings of the International Offshore and Polar Engineering Conference. vol. 1, pp. 91-97, Proceedings of the 4th International Offshore and Polar Engineering Conference. Part 1 (of 4), Osaka, Jpn, 10/04/94.

Fatigue of threaded tension leg platform tethers. / Brennan, F. P.; Dover, W. D.

Proceedings of the International Offshore and Polar Engineering Conference. Vol. 1 1994. p. 91-97.

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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AB - This paper describes the development and implementation of a typical variable amplitude load sequence on tethers for a tension leg platform. The dynamic response of the Hutton TLP was considered in defining a suitable tether tension response spectrum. This spectrum was then used to generate a time series to give a similar amplitude-frequency distribution. Two full scale variable amplitude fatigue tests on large diameter threaded connections are reported using the simulated load sequence. The fatigue test results are compared with constant amplitude results from a previous study on similar connections. A hybrid electric analogue-finite element technique was used to determine the local stress at the critically loaded tooth from which all failures were initiated. Fracture mechanics analysis of the critical cracks was conducted using a recently developed generic weight function solution for threaded connections. Crack aspect ratio was also considered together with previous related studies. In all, the paper presents useful fatigue crack growth data and analysis of threaded tether connections under realistic simulated service loading.

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Brennan FP, Dover WD. Fatigue of threaded tension leg platform tethers. In Proceedings of the International Offshore and Polar Engineering Conference. Vol. 1. 1994. p. 91-97