A stress magnification factor for plates with welding-induced curvatures

Federica Mancini*, Heikki Remes, Jani Romanoff

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

1 Citation (Scopus)
57 Downloads (Pure)


The fatigue strength of thin-walled structures can be reduced significantly by non-linear secondary bending effects resulting from geometrical imperfections such as axial and angular misalignments. The welding-induced distortions can cause a critical increase of the structural hot-spot stress in the vicinity of the weld. Traditionally, the classification society rules for the fatigue strength assessment of welded ship structures suggest an analytical formula for a stress magnification factor km for axial and angular misalignment under axial loading condition. Recently, the well-known analytical solution for the angular misalignment has been extended to account for the curvature effect. The present paper analyses the effect of non-ideal, intermediate boundary conditions between fixed and pinned ends. In this regard, the fixity factors ρ (with 0 ≤ p ≤ 1 from ideally pinned to clamped conditions) are introduced in order to model the actual constraint on the rotation close to the ends. Under tension, a non-negligible decrease of the km factor is observed in relation to the reduction of the fixity factor at the welded end, while the fixity factor related to the loaded end has a minor effect on the km factor. Under compression, the reduction of the beam end fixity factors results into lower buckling resistance.

Original languageEnglish
Title of host publicationStructures, Safety, and Reliability
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791884324
Publication statusPublished - 2020
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Ocean, Offshore and Arctic Engineering - Virtual Conference - Online, Fort Lauderdale, United States
Duration: 3 Aug 20207 Aug 2020
Conference number: 39

Publication series

NameProceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE


ConferenceInternational Conference on Ocean, Offshore and Arctic Engineering
Abbreviated titleOMAE
Country/TerritoryUnited States
CityFort Lauderdale
Internet address


  • Non-ideal boundary conditions
  • Non-linear geometry
  • Stress magnification factor
  • Thin plate
  • Welding distortions


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