DRILLPIPE FATIGUE LIFE PREDICTION MODEL BASED ON CRITICAL PLANE APPROACHES

The applicability of critical plane approaches to predict fatigue life expectancy of drillpipe is investigated. These approaches consist of physically-based damage parameters that are capable of handling complex axial, bending and torsional load histories. Two damage parameters are considered, one based on normal strain amplitude and the other on shear strain amplitude. Comparison of full scale results and data from polished coupons indicate a strong influence of microscopic surface discontinuities. Approaches are presented for dealing with these effects analytically, along with a discussion on effects of realistic drillpipe geometry and loading histories. Fatigue notch factors are estimated and used with the damage parameters. Results are correlated with data from full scale test facilities using Grade E drillpipe.

  • Supplemental Notes:
    • OTC 94, 26th Annual Offshore Technology Conf; 2-5 May 1994; Houston, Tx, USA. Procs. Vol 4, ppr 7569, p 523 [10 p, 31 ref, 11 tab, 17 fig]
  • Authors:
    • Placido, J C
    • Azar, J J
  • Publication Date: 1994

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00716184
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Feb 28 1996 12:00AM