Mechanism with deformable parts

[dcattoni]

Hi Guys

How it's going? I hope you are fine.

Here we go

I'm studying a simple rod - crank mechanism as a simplification of a complex model. My idea is try to set BC's and analysis type in order to be able to set the same in a hugh model. But, I was not able to set them in femap, since I don't know what type of analysis fixs with this problem (dyn transient, nonlinear transient nonlinear dyn????) , same with BC's.

I attach a picture where you will see my model and BC's.

Thanks for reading this query

Bye!

Msc Ing. D Cattoni

 

[rb1957]

no pic attached

another day in paradise, or is paradise one day closer ?

 

[dcattoni]

And now??

Msc Ing. D Cattoni

 

[dcattoni]

https://files.engineering.com/getfi...5e0-4dff-a17a-510ec08b90fe&file=rod_crank.PNG

Msc Ing. D Cattoni

 

[dcattoni]

Hi!!

Any idea?? I need help guys!!

Thanks

Msc Ing. D Cattoni

 

[karachun]

You need a nonlinear solver, with large displacements ON, to run this problem properly.
To make a hinge you may use a beam and release a rotational degree of freedom at one of the ends. Google about beam releases in Femap.

 

[rb1957]

since you have a mechanism, you maybe want to use a mechanical design program (like Adams) to analyze it.

I don't think FEA can solve this problem. I think you're applying a torque at the green circle, and want to see the RH end displace in X.
FEA wants to solve static structures in equilibrium.

If you apply a torque, FEA will want to say the reaction at the RH end is the balancing couple.
At the RH end you're fixing the the node, so the link is not a "two force member", which may be what you mean to do ?

Does "Msc Ing" mean "Master of Engineering Science" ?

another day in paradise, or is paradise one day closer ?

 

[dcattoni]

Hi rb1957 and karachun thanks for yours advice.

rb1957 in Argentina you put your different levels of education, for instance if you finish your bachelor in engineering, then you write Eng. XXXX. So, if you finish a master, then you write Msc. Eng. XXX.

I notice that I've written "Ing" instead of "Eng"

Thanks

Msc Ing. D Cattoni

 

[rb1957]

"Ing" is fine for Engineer ... it's used in Europe, and I guess in Argentina.

another day in paradise, or is paradise one day closer ?

 

[BlasMolero]

Dear Cattoni,
Please take a look to my blog here, this is what you need to solve your problem,the Simcenter Nastran multiStep Nonlinear (SOL402) module integrated with FEMAP supports large strains and large displacements, large rotations, and nonlinear materials. It supports also nonlinear kinematic joints and flexible sliders. Kinematic joints allow structural analyses of an assembly containing moving parts. With flexible sliders, you drive the displacement of parts along a line of beams that models a track. You can also add a nonlinear frictional behavior.

https://iberisa.wordpress.com/2020/...exibles-con-femap-y-simcenter-nastran-sol402/

Best regards,
Blas.

~~~~~~~~~~~~~~~~~~~~~~
Blas Molero Hidalgo
Ingeniero Industrial
Director

IBERISA
48004 BILBAO (SPAIN)
WEB:

http://www.iberisa.com

Blog de FEMAP & NX Nastran:

http://iberisa.wordpress.com/