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08-30-2016 10:49 PM

4 REPLIES

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08-31-2016 03:04 AM

Hello!,

I suggest to start with a simply model (a GLOBAL model) using **1-D CBEAM** elements and next compare results using a more detailed model (LOCAL model) meshing with **2-D Shell CQUAD4** elements using the **MIDSURFACE** of the tube.

You don´t mention the target of the analysis, what results you are looking for, etc... Is not the same to perform a linear static analysis or a Buckling analysis, or a Dynamic Response analysis or a nonlinear analysis, the element type & mesh density is different. Perhaps you only need to know the natural frequency of the structure?.

In any case, always begin with a simplified FEA model, 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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08-31-2016 03:41 AM

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08-31-2016 03:43 AM

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08-31-2016 03:51 AM

Hello!,

If stress results is what you need, then create a midsurface of the tube and mesh with 2-D Shell CQUAD4 elements. The minimum mesh density requirements for a cylindrical surface to mesh with 4-nodes plate elements is to use 6 elements each 90º, ie, one plate element each 15º.

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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