Materials Research (Dec 2005)

Fatigue analysis of aluminum drill pipes

  • João Carlos Ribeiro Plácido,
  • Paulo Emílio Valadão de Miranda,
  • Theodoro Antoun Netto,
  • Ilson Paranhos Pasqualino,
  • Guilherme Farias Miscow,
  • Bianca de Carvalho Pinheiro

DOI
https://doi.org/10.1590/S1516-14392005000400009
Journal volume & issue
Vol. 8, no. 4
pp. 409 – 415

Abstract

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An experimental program was performed to investigate the fundamental fatigue mechanisms of aluminum drill pipes. Initially, the fatigue properties were determined through small-scale tests performed in an optic-mechanical fatigue apparatus. Additionally, full-scale fatigue tests were carried out with three aluminum drill pipe specimens under combined loading of cyclic bending and constant axial tension. Finally, a finite element model was developed to simulate the stress field along the aluminum drill pipe during the fatigue tests and to estimate the stress concentration factors inside the tool joints. By this way, it was possible to estimate the stress values in regions not monitored during the fatigue tests.

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