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Stress in Thin Film for Self-Curving
Posted 27 ott 2020, 23:06 GMT-4 MEMS & Nanotechnology, Structural & Acoustics, General, MEMS & Piezoelectric Devices, Geometry, Materials, Mesh, Modeling Tools & Definitions, Parameters, Variables, & Functions, Results & Visualization, Studies & Solvers, Structural Mechanics Version 5.5 0 Replies
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Hello, I just want to say I am new at COMSOL so this might be trivial, but thank you for any help you can provide!
I am trying to simulate using swelling (or stress or strain, whatever works) to create curving in a thin-film of a polymer (SU8). I created a simple thin rectangle and made the hydroscopic swelling coefficient proportional to z. I put one point in the middle of the bottom face and made that the point constraint for the structure.
In theory, the film should fold into a cylinder like in this research paper in Figure 3a, because of the stress gradient in the z direction: https://www.nature.com/articles/ncomms1531 . However, it only gets to the point in the image attached here (with the deformation scaled by 10), before getting a non-convergience error. It does not complete the curve into a cylinder. Would it be possible to model the whole curving using COMSOL, and if so, do you have any advice for how I can model this correctly? My COMSOL file is also attached here.
Thank you so much!
Hello Carol Mikhael
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