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winLIFE 4.0: Multiaxial Fatigue Analysis for FEMAP & NX Nastran

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Hello!,

I have just written a post in my blog regarding the new release of winLIFE 4.0, a fatigue analysis software integrated with FEMAP that take advanced of NX NASTRAN results (as well as from others FEM/FEA codes) to perform Fatigue Analysis, both uniaxial & multiaxial. The post is written in Spanish, but always we have the Google translator:

https://translate.google.com/translate?hl=es&sl=es&tl=en&u=https%3A%2F%2Fiberisa.wordpress.com%2F201...

 

By means of a tutorial example I explain how to use both winLIFE 4.0 & Femap interface to perform the multiaxial fatigue analysis of a Rotating Shaft with an internal bore hole and a cross hole. A fatigue life calculation is to be carried out for this component for a rotating movement around the middle axis.

 

In the simulation the "trick" used is the following: instead of rotating the shaft with a fixed load, the shaft is fixed and the load rotates around the shaft. The loading of the shaft is given in angular increments, selecting an "angular window" of 90°, which results in load application angles of 0°, 90°, 180° and 270° for a unit load of 1000N. The continuous rotating movement is shown by four load cases (in real life problems the recommendation is to use a window of 30º for accuracy reasons).

 

ex23-eje-geometria.png

 

Here you are the stress results for the rotating shaft at the load application angle of 0º:

 

ex23-SolidMaxPrinStress-lc1.png

 

And here you are the Fatigue Damage Sum results back in FEMAP for postprocessing:

 

femap-result-damage.png

 

And finally here you are the Utilization Ratio results back in the FEMAP model: an utilization ratio of 1.0 signifies the endurance limit is reached. A degree of utilization of 0.044 means a 4.4% usage of the endurance limit. The Utilization Ratio is the inverts of the Safety against Endurance Limit, result computed as well by winLIFE.

 

femap-result-utilization-ratio.png

 

Best regards,
Blas.

Blas Molero Hidalgo, Ingeniero Industrial, Director
IBERISA • 48004 BILBAO (SPAIN)
WEB: http://www.iberisa.com
Blog Femap-NX Nastran: http://iberisa.wordpress.com/