Fatigue design of welded double-sided T-joints and double-sided cruciform joints in steel marine structures: A total stress concept

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Abstract

Fatigue is a governing design limit state for marine structures. Welded joints are important in that respect. The weld notch stress (intensity) distributions contain essential information and formulations have been established to obtain a total stress fatigue damage criterion and corresponding fatigue resistance curve; a total stress concept. However, the involved weld load carrying stress model does not provide the required estimates and trends for varying geometry dimensions and loading & response combinations. A new one has been developed and performance evaluation for T-joints and cruciform joints in steel marine structures shows that in comparison with the nominal stress, hot spot structural stress and effective notch stress concept based results up to 50% more accurate fatigue design life time estimates can be obtained. Taking advantage of the weld notch stress formulations, the effective notch stress concept performance has improved adopting a stress-averaged criterion rather than a fictitious notch radius-based one.

Original languageEnglish
Pages (from-to)2674-2693
Number of pages20
JournalFatigue and Fracture of Engineering Materials and Structures
Volume42
Issue number12
DOIs
Publication statusPublished - 2019

Keywords

  • fatigue design
  • joint resistance curve
  • steel marine structures
  • total stress criterion
  • welded double-sided cruciform joints
  • welded double-sided T-joints

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