Welded structures are simulated for stress
A
Safe Technology product story
Edited by the Engineeringtalk editorial team
Feb 5, 2007
The Verity method is a major departure from traditional weld fatigue analysis approaches.
The Equity Group has selected Verity, the mesh-insensitive structural stress methodology for the fatigue evaluation of welded structures.
Verity is commercially available only in fe-safe, the state of the art suite of fatigue analysis software for FE models from Safe Technology.
The Verity method, developed by Battelle researcher, Dr Pingsha Dong, has been validated against 3500 different types of welded joints by major companies and leading experts across a broad array of industries and is demonstrating unprecedented accuracy.
This year it was licensed exclusively to Safe Technology to create an addon module in fe-safe for weld fatigue life prediction.
The Verity method is a major departure from traditional weld fatigue analysis approaches.
There are three key features that make this approach unique.
First, it uses nodal forces to determine a "structural stress" at the weld toe.
Secondly, nodal forces are much less sensitive to mesh density than standard FEA stresses, thereby making Verity mesh insensitive.
And thirdly, it uses a single S/N curve for all welds, be they structural welds, seam welds, spot weld, solder joint etc, and for all thicknesses of sheet and plate, and all types of loading.
The applicability of Verity to any area of industry where the fatigue life of welded structures and components is an issue has profound implications for product design in terms of performance, quality and cost.
Robert Brown, Director of Consulting, The Equity Engineering Group, comments: "The software is being used primarily for fatigue assessment of pressure containing equipment in the oil refining, petrochemical and other process industries".
"These analyses are typically performed to evaluate in-service equipment to assess remaining life and to develop appropriate inspection intervals".
"In some cases, these analyses are performed to satisfy jurisdictional requirements to validate fatigue design life when suitable calculations were not performed during the initial design phase".
"As a result, predictability is a key aspect of the calculations, since some current pressure vessel design fatigue methods include overly conservative design margins and outdated technology".
"The addition of fe-safe and Verity to our suite of innovative products and technologies allows our clients to effectively manage the reliability of their cyclic equipment, which ultimately leads to improved safety and considerable economic advantages".
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