Analysing weld stress added to durability software
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Safe Technology product story
Edited by the Engineeringtalk editorial team
Mar 20, 2006
Durability analysis software for FE models includes mesh-insensitive structural stress method for fatigue evaluation of welded structures.
The latest version of the durability analysis software for FE models, Fe-Safe v5.2, includes a number of enhancements along with the add-module, Verity.
The release of Verity in Fe-Safe marks the first commercial introduction of Battelle's methodology, the mesh-insensitive structural stress method for fatigue evaluation of welded structures.
The Verity method can be applied to structural welds in thick plate, seam welds in thin sheets and spot welds.
Benefits of the methodology are that the equivalent structural stress is calculated at the weld, not at some distance from it; a single S-N curve can be used, so there is no need to classify the welded joint.
The method is insensitive to the mesh density and element types used in the FEA.
The same S-N curve can be used for structural welds in thin and thick plate, and to seam welds, spot welds, laser welds and other weld types.
Verity has been developed with more than a dozen engineering companies in Battelle's Joint Industry Project (JIP), and has been verified by correlating the results of more than 800 sets of welded joint fatigue test data.
The applicability of Verity to any area of industry where the fatigue life of welded structures and components is an issue has implications for product design in terms of performance, quality and cost.
Distributed processing in Fe-Safe v5.2 allows a single analysis to be spread over multiple processes, gaining increases in speed when dealing with large models or complex analyses.
Fe-Safe is suitable for distributed processing because it analyses each node separately; there is no nodal interdependence to slow the analysis down.
Benchmarks indicate that savings in analysis time can be achieved.
The software automatically splits up, queues and remerges the job.
Plus, once the user hits 'analyse', the client computer is free to set up the next task.
Analysis-only licences can be purchased to use this feature or, for companies that already hold multiple Fe-Safe licences, there is no additional cost.
The extended materials database included as standard contains more materials and more data per material.
In version 5.2 there are equivalent specifications, chemical compositions, heat treatments and failure criteria for close to 500 material entries including steels, irons, titaniums, aluminium alloys and coppers.
Visual loading definition in the GUI allows easy set up of complex loading histories.
All the complex loading definitions previously requiring editing of textual LDF files are available at the click of a mouse.
Prescanning of FEA models is an enhancement that provides the option to preread an FEA model.
It provides a list of what can be read from the model and the user selects appropriate data sets to be read in.
This option provides another means of speeding up the analysis without compromising accuracy.
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