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Apply load on a 2D cross section

Pioneer
Pioneer

Hi,

 

Whats an easy way to apply loads (Fx,y,z & Mx,y,z) to the CG of a 2D (surface) cross section, then obtain the stress values at each corners (left/right/top/bottom) of that cross section (stress checkpoints)?

 

Thanks,

Aero1

7 REPLIES

Re: Apply load on a 2D cross section

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Dear Aero1,

If you model your problem using 1-D line CBAR/CBEAM elements mesh your beam elements in the CoG of the cross section and you are done: you can request to have stresses automatically at the four stress recovery points. You can select manually the location of the four stress recovery points. Use the shape "General Section", this way you can select the cross section surface.

cbeam-stress-recovery-point.png

But I understant that you have meshed your component with 3-D solid elements and in the cross section you have located the CoG: then put a grid there and use an RBE3 element to distribute your loads in the cross section. In the DOF of the dependent node activate ALL DOF.

rbe3.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/

Re: Apply load on a 2D cross section

Pioneer
Pioneer

Thank you for your reply, my cross section looks like the following snapshot (please see the attached file), obviously the CG is located in the same plane, so should I add a node where the CG is located and then connect that to the rest of the nodes throughout the section via RBE3 elements?! How should I define the constraints?!

 

 

Re: Apply load on a 2D cross section

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Dear Aero1,

Your question about "contraints" let me confused, better post the full model to have a clear idea of what you need, 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: Apply load on a 2D cross section

Pioneer
Pioneer

Hi Blas,

 

Thanks for your reply, here is a simple cross section I made, simply I would like to apply loads and moments to the CG of this cross section and then study the stress values at the stress recovery points.

 

Thanks,

Aero1

Re: Apply load on a 2D cross section

Pioneer
Pioneer

Hi Blas,


So basically, I would like to know if it is possible to study the load distribution (from any point in that plane, CG, Shear center,...) on any 2D cross section or not?

 

Thanks,

Aero1

Re: Apply load on a 2D cross section

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Dear Aero1,
Take a look to my post in the blog, there you have methods to distribute remote loads using RBE2 & RBE3 elements:

https://iberisa.wordpress.com/2015/10/13/rbe2-vs-rbe3-on-femap-with-nx-nastran/

caso3-viga-voladizo-Z-shape.pngcaso3-RBE2.pngcaso3-RBE3.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/

Re: Apply load on a 2D cross section

Pioneer
Pioneer

Perfect!, thank you.

 

Aero1