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02-04-2014 05:58 PM

Hello all. I am a new user to FEMAP.

I am doing FEA Analysis and get results from von mises stress. But the problem is that I can see only numbers without units. There is not unit legend in the graph.

Do you how can I show up the units or change the unit system to SI ??

Thank you in advance

Solved! Go to Solution.

9 REPLIES

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02-05-2014 05:30 AM

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02-05-2014 05:37 AM

ok but how could i see what dimensions does it use?

Panagiotis Rokanis

Panagiotis Rokanis

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02-05-2014 09:23 AM

Dear Rokanys,

FEMAP do not manage any unit system, is the only user responsibility to have a coherent system of units between length, area, force, stress, etc..

The first task to do is to set the units when importing geometry, this is the only case that FEMAP set units: if you want geometry in meters, set scale factor = 1.0

Later is only you the responsible to set a coherent system of units: if you define geometry in meters, and enter loads in N or pressure in N/m2, and define Young Module in Pascals, then stresses will be in Pascals (ie, N/m2) as well and displacement results in meters, OK?.

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/

IBERISA • 48004 BILBAO (SPAIN)

WEB: http://www.iberisa.com

Blog Femap-NX Nastran: http://iberisa.wordpress.com/

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02-05-2014 01:40 PM - edited 02-05-2014 01:41 PM

Here is a link to a usefull PDF (courtesy of CADimage PLM).

http://c2201042.cdn.cloudfiles.rackspacecloud.com/TechTip-Engineering-Units.pdf

Go to page 5 in this PDF, there you have most of the units in all major unit systems (including mm) and how to convert between them.

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02-05-2014 01:42 PM

But I think it's not user friendly. It must be able to define units or unit system. It's complicated

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02-05-2014 02:22 PM

Dear Panrok90,

In fact, this is a problem in FEMAP, specially for beginners. But I agree with you that this should be improved urgently, not excuses, any modern FEA software like FEMAP should include native support of * units management *to avoid user errors. Please developers ....

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/

IBERISA • 48004 BILBAO (SPAIN)

WEB: http://www.iberisa.com

Blog Femap-NX Nastran: http://iberisa.wordpress.com/

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02-05-2014 02:30 PM

In the results I can get only output vector for von mises stress

(E_CTRL_INPUT) and material density (MAT_PROP_NORMALISED)

Do you know how to show an output vector with deformation (total

translation)?

Otherwise, how can I run an normal FEM analysis with the optimised shape as

input, and not the initial one.

Thank you in advance

______________

Panagiotis Rokanis

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02-05-2014 03:42 PM

Dear Panagiotis,

I guess you are referring to TOPOLOGY Optimization??. This is TOSCA, not NX NASTRAN, then here not too much to do, this is a third party software, take a look here:

http://iberisa.wordpress.com/2011/08/28/optimizacion-topologica-con-femap-y-nx-nastran/

Regarding to use the optimized shape as input for a FE model, well, the focus behind Topology Optimization is to get the "design idea", then based in the idea you modify the geometry base and perform all the FEA analysis required.

Take a look to this post for "ideas" to take advanced of the optimized shape written in STL. The workflow is to create geometry and the to mesh with solid elements. But from the practical point of view the most efficient way, in my opinion, is create new geometry (in FEMAP or using SolidEdge ST6) based in the optimized shape:

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/

IBERISA • 48004 BILBAO (SPAIN)

WEB: http://www.iberisa.com

Blog Femap-NX Nastran: http://iberisa.wordpress.com/

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02-05-2014 03:49 PM

Actually, I use Solidworks. So, I am going to create new geometries

depending on the Topology results, and then new FEM analysis

Thank you for your help. I really appreciate it.

______________

Panagiotis Rokanis

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