Fatigue analysis using linear static solver 1

[AVeldtman]

Hi all

What would me the best way to ascess fatigue life using a linear static solver, not everybody can afford something like winlife.

I am especially interested in the fatigue of welds, although I'm not sure you can really model welds, as the weld geometry is to inconsistent and unpredictable.

 

[corus]

British Standard fatigue assessment codes are based upon the nominal stress adjacent to a weld and hence the weld is never modelled in a structural FE analysis to be used for fatigue assessment. From the static linear model calculate the surface principal stress range between load cases and use these values extrapolated to the weld juncture for your assessment.

 

[PVI]

local weld modelling approach to global weld modelling approach seems to be promising. An interesting approach is used within LMS Virtual lab durability (ie Falancs).

 

[mloew]

Corus,

I believe this is the standard you are referring to:

Standard No.: BS 7608(1993)
Title: CODE OF PRACTICE FOR FATIGUE DESIGN AND ASSESSMENT OF STEEL STRUCTURES
Summary: Gives advice for methods for the fatigue design and assessment of parts of steel structures that are subject to repeated fluctuations of stress. Applies to: parent material remote from joints; bolted or rivetted joints in such material; welded joints (in air or sea water) in such material; shear connectors between concrete slabs and steel girders acting compositely in flexure. Does not consider the possible onset of unstable fracture from a fatigue crack. Coverage includes: stress calculations; allowable fatigue stresses. Also gives detailed annexes, tables and diagrams.

Publisher:
BSI: BRITISH STANDARDS INSTITUTION
389 CHISWICK HIGH ROAD
LONDON
W4 4AL
Best regards,

Matthew Ian Loew

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[Irwin]

Try FEMFAT!

http://www.femfat.com!

I think this is the realy best fatigue software!

Irwin