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A Mechanics Based Parametric Description of Residual Stress Profiles for Fracture and Fatigue Assessment FREE

[+] Author Affiliations
Pingsha Dong

Battelle Memorial Institute, Columbus, OH

Paper No. PVP2005-71514, pp. 939; 1 page
doi:10.1115/PVP2005-71514
From:
  • ASME 2005 Pressure Vessels and Piping Conference
  • Volume 6: Materials and Fabrication
  • Denver, Colorado, USA, July 17–21, 2005
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4191-X | eISBN: 0-7918-3763-7
  • Copyright © 2005 by ASME

abstract

It has been shown in a series of recent publications that any arbitrary residual stress distribution can be decomposited into through-wall “self-equlibrating” and “bending”. In this paper, a mechanics based parametric description of through-wall residual stress profiles is provided for fracture and fatigue assessment of girth welds. This parametric equation contains two fundamental parameters: (1) relative heat input and (2) pipe thickness to radius ratio. For a given welding procedure and heat input, the through-thickness resdual stress distributions as well as magnitude are shown to exhibit a continuous transition from bending to self-equilibrating as r/t ratio increases. As a result, a single parametric equation can be established for describing through-wall residual stress distributions for a full range of pipe diameters and thicknesses as well as weld configurations. A series of detailed finite element simulations were also performed to validate the predictions by the parametric equiations proposed.

Copyright © 2005 by ASME
This article is only available in the PDF format.

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