How to bend a beam to specific radius of curvature

  • Last Post 20 December 2018
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jackkcwu posted this 05 December 2018

Hollo everyone, 

I got a problem when doing a simulation with a multi-layer beam bending. 

I want to apply the specific radius of curvature to beam such as 0.5mm, 1mm, 5mm and so on. 

But I don't know where I can set up this request. Does anyone can help me?

Many thanks,


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peteroznewman posted this 05 December 2018

You can't specify a specific radius of curvature, but you can apply a remote displacement to the end of the cantilever and set only one rotation, and leave all other DOF free. That will bend the beam into a circular looking shape.

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jackkcwu posted this 05 December 2018

Many thanks to your suggestion. I will try it ASAP. 

Is it possible to use a mandrel to fix the bending radius? 

SandeepMedikonda posted this 05 December 2018

Yes, You can specify a mandrel (rigid body maybe) and define contact and that would control the amount and the position that the beam would bend. If you just want to see a bent shape, I would recommend what peter suggested above.

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jackkcwu posted this 05 December 2018

Thank you Sandeep. Let me test it. 

peteroznewman posted this 06 December 2018

Here are two discussions with a member who was wrapping a multilayer glass around a form (mould).

Discussion #1

Discussion #2


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jackkcwu posted this 17 December 2018

Hi Peter, 

I set the left all face with "fix". Right all face with with a remote displacement, and set only -x rotation with -30 degree, others are free.  

But it shows a warning after calculation like attachment. 

Does it mean my cantilever is not suitable to bend? 

- I set all interfaces with "bonded". 


peteroznewman posted this 17 December 2018

Hi Jack,

The Warning is telling you to click on Analysis Settings, and on the line Large Deflection, to change the setting from No to Yes, then solve the model again.

The solver uses the small rotation assumption to give faster answers to models where the small rotation assumption is valid.

By turning on Large Deflection, you tell the solver to iterate, updating the position of the nodes as they deflect, recomputing the stiffness matrix and take longer to show a result, but a result that is correct for large rotations such as 30 degrees.

There is no harm in turning on Large Deflection if you are not sure, you will just wait a little longer for the solution to complete.


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jackkcwu posted this 20 December 2018

Hi Peter,

It works. Many thanks for your supporting ~