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Simulation with large deformation beam

Posted Nov 20, 2018, 10:40 p.m. EST MEMS & Nanotechnology, Structural & Acoustics, Studies & Solvers, Structural Mechanics Version 5.4 1 Reply

Dingkang Wang
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I am doing a simple simulation of large deformation beam. I made a 2D Al/Ox bimorph and apply thermal expansion with delta T = 300K. I should expect the bimorph would curve into a perfect arc.Just like the first photo. With longer cantilever, it would curve into a circle. But the simlation tell me it will not. It looks like the bimorph will just goes up without curve back. I think the simulation is not correct. I already try to use "Segregated" in the solver but it doesn't work. But how can I change the setting of the solver?

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1 Reply Last Post Nov 21, 2018, 10:08 a.m. EST
Henrik Sönnerlind COMSOL Employee

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Posted: 6 years ago Nov 21, 2018, 10:08 a.m. EST
Updated: 6 years ago Nov 21, 2018, 10:08 a.m. EST

Hi,

For large deformations, you must switch on geometric nonlinearity in the study settings, and ramp up the load using a continuation solver. See for example

https://www.comsol.com/model/large-deformation-analysis-of-a-beam-204

Regards,
Henrik

-------------------
Henrik Sönnerlind
COMSOL
Hi, For large deformations, you must switch on geometric nonlinearity in the study settings, and ramp up the load using a continuation solver. See for example Regards, Henrik

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