Investigation of fatigue assessments accuracy for beam weldments considering material data input and FE-mode type

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Abstract

This study investigates the effects of fatigue material data and finite element types on accuracy of residual life assessments under high cycle fatigue. The bending of cross-beam connections is simulated in ANSYS Workbench for different combinations of structural member shapes made of a typical structural steel. The stress analysis of weldments with specific dimensions and loading applied is implemented using solid and shell elements. The stress results are transferred to the fatigue code nCode DesignLife for the residual life prediction. Considering the effects of mean stress using FKM approach, bending and thickness according to BS 7608:2014, fatigue life is predicted using the Volvo method and stress integration rules from ASME Boiler & Pressure Vessel Code. Three different pairs of S-N curves are considered in this work including generic seam weld curves and curves for the equivalent Japanese steel JIS G3106-SM490B. The S-N curve parameters for the steel are identified using the experimental data available from NIMS fatigue data sheets employing least square method and considering thickness and mean stress corrections. The numerical predictions are compared to the available experimental results indicating the most preferable fatigue data input, range of applicability and FE-model formulation to achieve the best accuracy.
Original languageEnglish
Article number012025
Number of pages14
JournalJournal of Physics: Conference Series
Volume843
DOIs
Publication statusPublished - 2 Jun 2017
Event6th International Conference on Fracture Fatigue and Wear - University of Porto, Porto, Portugal
Duration: 26 Jul 201727 Jul 2017
http://www.ffw.ugent.be/

Keywords

  • fatigue
  • weld
  • FE analysis
  • ANSYS
  • ncode
  • fintie element types
  • residual life assessments
  • stress integration

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