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We have written an add-in for FEMAP v10.3.1B/v11 that performs stress linearization in solid FEMAP models. Once you install it, there’s an .exe that can be run that as long as FEMAP is running will pop up a FEMAP Add-In pane inside of FEMAP and walk one through picking two nodes to calculate the linearization between.

This is based on 2007 ASME Section VIII, Division 2 – Annex 5.A Linearization of Stress Results for Stress Classification.

I would also like to credit the engineers at Pressure Vessel Engineering, they have an excellent web site and some very useful information about Stress Linearization and Pressure Vessel stress analysis –

http://www.pveng.com/FEA/FEANotes/NutsBoltsStress/

Remember –

This is a Beta Test unsupported FEMAP utility.

This program assumes your solid stresses are in the Global Rectangular system, it does not account for solid elements stresses with any other reference coordinate system. The transform to a Coordinate System in line with the SCL is hard-coded from Global.

Basically, one chooses two nodes in FEMAP and a FEMAP Output Set. According to the ASME Document (the document), this Stress Classification Line (SCL) should be as perpendicular to the outer surfaces of the pressure vessel to be effective. . The program linearly interpolates the six components of 3-D stress at multiple points along this line. A membrane stress value is calculated at the interpolations points based on the 1/t formula from the document. A bending stress value is also calculated, according to the document, only the stress in the plane perpendicular to the SCL should be used, these is the “Full Component Bending” option, with it on, all components are used, with it off, it’s only using the in-plane ones. We’ve seen tools that do this both ways. The bending stress is calculated with the 6/t^2 formula from the document. The calculated Membrane and Bending stresses are plotted vs. the SCL. In addition, some other key values are indicated. The actual full component stress values are also shown along the SCL from the FEA results.

Download and unzip to a temp directory and then run the setup in there.

Works with FEMAP v10.3.1 and v11.0.x – you need a solid model with stress results, run the .exe and a pane will displayed in FEMAP.

Choose an Output Set, Select Two nodes, and the stress linearization is performed along the line. Each time you select two new nodes, or change the output set, or any of the options, the graph/results will be updated, and a copy of the results gets sent to the clipboard, so if you paste, you get –

FEMAP Stress Linearization Tool

All Data Calculated as von Mises Stresses

Only in-plane (relative to the SCL) stress tensor components used to calculate linearized bending stress.

Stress Linearization between Nodes 6121 and 6123

Data from FEMAP Model - C:\mastemp\StressLinearization\Example\FEMAP.modfe

From FEMAP Output Set 4 - Titled - Step 1, Sub 4, - 1.

The Linearized Membrane Stress is calculated as 243.729

The Linearized Bending Stress is calculated as 1867.64

The Linearized Maximum Combined Membrane and Bending Stress is calculated as 1963.162

The Maximum von Mises Stress along the SCL is 2689.801

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