flexible folding

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  • Last Post 14 December 2018
Aaron posted this 12 December 2018

A V-shaped hinge which is flexible material. wanna to fold it and let the two oblique surface coincide with each other, and then to see the strain energy. tried force and displacement both, neither works. appreciate it if you have any suggestion and advice.

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Aaron posted this 14 December 2018

Cool, I have tried that it works.Thanks a lot. Thanks for all  your help.

peteroznewman posted this 14 December 2018

Hi Aaron,

I used a mesh control to get more elements into the hinge area. When there are not enough elements, the model becomes less flexible than the real part.

I used a rotation input of 120 degrees on the Z-axis and used Initial and Minimum Substeps of 60 under Analysis Settings, Automatic Step Control.

Regards,
Peter

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Aaron posted this 13 December 2018

ok. Here is it.

Attached Files

peteroznewman posted this 13 December 2018

Aaron,

Please create a Workbench Project Archive .wbpz file and attach it to your post above using the Attach button. I will have a go at some BCs that might work. One example is to put the moment on the face opposite the one marked A, while keeping the direction of the moment as you show it now. Another example is to put a remote displacement on the face opposite the one marked A and apply a rotational displacement, while leaving all the other DOFs free. This is equivalent to the previous suggestion, but displacements BCs often converge more easily than forces or moments.

Regards,
Peter

Aaron posted this 13 December 2018

The material is composite(epoxy et al.) The constrains and loads are shown in the pics.The left side is fixed, and the moment is applied on in the middle of the hinge, right beneath the thinnest point. The final configuration is also pasted. It didnot fold along the hinge. what is the matter? 

thanks

Aaron posted this 13 December 2018

I will clean up all the details. Hope to communicate with you.

Thanks.

jj77 posted this 13 December 2018

As peteroznewman, we would need some more specific info. in order to help you.

 

In the mean time for your reference only (made up boundary conditions, pressures, and material) below is a small example of a similar part (2D plane strain), where it is pinched (fixed at 9 nodes at the centre, see second/third image below, nodal selection and nodal displacements.), and where a pressure is applied on the 2 bottom edges in order to fold it. Material used is some rubber taken from the hyper el. material library in ansys. Pressures are applied gradually (last image below, pressure variation. Also there is a contact between the contacting edges. The analysis settings are shown in the last image.

 

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peteroznewman posted this 12 December 2018

There are many Discussions on hyperelastic materials on this site.  You might learn something from this one.

Please describe your model, what material model did you use, what supports and load did you use in detail, what analysis settings.

Show the error message you got.

Regards,
Peter

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