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Highly stressed volume approach in ANSYS apdl

Highly stressed volume approach in ANSYS apdl

Hi all at Eng-tips

I i'm getting better and better at the apdl-language, even though i still think its a bit daunting. I've started to work on a technique to extract the highly stressed volume in a component for fatigue life assessment. In short, the highly stressed volume of the component (minimum ∽95* maximum of principal stress ) should (i'm going to investigate this further) correlate well with the fatigue strength of the component. (R. Kuegel first described the method as far as i know).

The code is currently as follows:

CODE --> apdl

!Select Named selection

!Get Maximum pricipal stress in selection and the number of the stressed node

!Select nodes that has a stress of at least 0.9*NS_SMAX
!Select elements that contain at least one of the selected nodes 

!Get number of selected nodes

!State variables

!Sum up the volume of elements
tot_vol = tot_vol+el_vol

And the following nodes is selected and calculated the volume of:

The current methods accuracy is highly dependent on the mesh size. To improve performance some form of interpolation is needed.

Any questions or ideas for improvement are very welcome :)

Best, BTHS

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