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Axisymmetric Quad element

Dear All,

 

I want to perform an analysis by 2D axisymmetric model but when I export the .nas file Femap converted al quad element into tria element.

Is possibile to perform an axisymmetric analysis by using quad elements?

 

Best regards

S

8 REPLIES

Re: Axisymmetric Quad element

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Dear Stefano,

The following works with FEMAP V11.3.2 for NX NASTRAN V11.0:

1.- Select the property AXISYMMETRIC under Volume Elements.

2.- Click in FORMULATION and select CTRAX3, CQUADX4, CTRAX6, and CQUADX8 elements, these are the only supported by modern NX NASTRAN V11.0, the other CTRIAC, CTRIAX6 & CQUADX are not longer supported.

 

axisymmetric_elements.png

 3.- Make sure the axisymmetric elements are defined in the X-Z plane of the basic coordinate system, where the Z axis is the axial direction and the X axis is the radial direction. Remember, all grids must lie in the X-Z plane of the basic coordinate system, please list in FEMAP the nodal coordinates to make sure!!.

If you run this way then FEMAP will export correctly the NX NASTRAN input deck using CQUADX4 elements, use command PREVIEW ANALYSIS to preview the *.dat file, 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/

Re: Axisymmetric Quad element

I'm sorry,

 

I must specify that:

 

1) I refer to 2d axisymmetric element (plane element)

2) I use Autodesk Nastran instead NX nastran

 

Regards

S

Re: Axisymmetric Quad element

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Hello!,

The AXISYMMETRIC under VOLUME ELEMENTS is the only option in FEMAP to choose to simulate 2-D solid planar axisymmetric problems meshed with 2-D CQUADX4 elements, this is the only option to use with any FEA solver. The following animation shows an example solved for linear static with EDGE-TO-EDGE Contact between two metallic parts (one Aluminum and other Steel) when one part gets increased the temperature:

URES_axi_2d.gif

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/

Re: Axisymmetric Quad element

Dear Blas,

 

can you share the .modfem?

 

Thanks.

Stefano

Re: Axisymmetric Quad element

I set CQUADX4 option in axisymmetric volume element.

When I export the model I otbain this message:

 

axisymmetric problemaxisymmetric problem

 

 

If I click yes FEMAP convert quad into tria element

 

 

 

Otherwise I obtain this error message:

 

 

 

where I'm wrong??

 

Stefano

Re: Axisymmetric Quad element

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Dear Stefano,

Which version of FEMAP are you using?. This problem sounds to me to old versions ...

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/

Re: Axisymmetric Quad element

the latest version 11.3.2

Re: Axisymmetric Quad element

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Dear Stefano,
Then contact GTAC at https://www.plm.automation.siemens.com/en_us/support/gtac/ and send them a copy of your problem to improve FEMAP to work good with your FEA solver.

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/