Fatigue Testing and Finite Element Analysis of Bridge Welds Retrofitted by Peening under Load

Residual stress-based post-weld treatments such as needle peening, hammer peening, and ultrasonic impact treatment (UIT) offer a promising means for extending the fatigue lives of existing welded highway bridges. When applied to bridge welds in service, these treatments can be particularly effective, since the stresses due to the self weight of the bridge have already been imposed. In this paper, a finite element (FE) analysis study is performed to investigate the additional benefit that may result from applying post weld-treatments under load. Fatigue tests of small-scale weld specimens treated with and without preloading are first described. 2D FE models that simulate the treatment process are then described and used to model the treatment of the fatigue specimens. Effects of plate thickness, indentation depth, and preload level on the residual stress distribution induced by peening under load are then studied. Based on the results of this work, recommendations are made to aid in the prediction of the fatigue performance of bridge welds retrofitted by peening under load.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 648-656
  • Monograph Title: Structures Congress 2012

Subject/Index Terms

Filing Info

  • Accession Number: 01502356
  • Record Type: Publication
  • ISBN: 9780784412367
  • Files: TRIS, ASCE
  • Created Date: Nov 12 2013 2:28PM