Femap & NX Nastran Nonliear vs Abaqus Nonlinear

[MustafaBayansar]

Hi All,

I really appreciate your opinion and kind advice regarding comparison Femap&NX Nastran vs Abaqus nonlinear. I'm currently using Femap 11.1.2 the latest version. I got a job to run a nonlinear analysis for a rubber mount in Femap and compare it with Abaqus result. I got following result value for the same assembly model and 97% same result modelling.
(Abaqus) [Femap]
Displacement: (9.49) , [9.58]
Stress Max Prin: (5.99) , [5.8]
Stress Von Mises: (22.1) , [17.03]
I have heard and read a lot of opinion about Abaqus nonlinear capability and done comparison analysis myself. I'm confused for the difference of the stress value and I'm not sure which could be closer to real world experience. Do you have any idea or similar experience with Abaqus vs femap or other CAE software?

regards
Mustafa

 

[Naffoussi]

Hi,

The difference can occurs regarding the way you average results in Femap (average / Max / Min ) by property, material, angle...
play with these parameters and see if you will obtain something closer to the Abaqus results. See also how Abaqus average the stress results.

Regards,
SN

Seif Eddine Naffoussi, Stress Engineer

http://www.Innovamech.com

33650 Martillac – France

 

[MustafaBayansar]

Hi compositecurves,

thanks for your kind advice and I have already tried all angles (max, min, average centroid etc.)to close Abaqus value but all the values are same pretty much or much smaller than Abaqus value(Average or max centroid). By the way Abaqus shows only average value since I have little experience with it. I think for better comparison i should compare both with average Stress Von Mises not max or min, am I right?

 

[Naffoussi]

Indeed to better compare the two results you need to understand how the two software works. I suggest to compare the Max to avoids difference that can come from the averaging methods. I use the same approach when I want to compare Femap and Patran results...


Regards,
SN

Seif Eddine Naffoussi, Stress Engineer

http://www.Innovamech.com

33650 Martillac – France