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Prescribed Displacement vs Boundary Load
Posted 06.03.2020, 18:12 GMT-5 Geometry, Structural Mechanics Version 5.3a 1 Reply
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Hi all,
I'm new to comsol and trying to figure something out. I'm making a helix geometry of some thickness, and trying to stretch it along the long axis. When I use a prescribed displacement, the helix elongates, only in the long (z) axis, as I like. However, I would like to instead use a force (of known amount) to stretch the helix. When I apply a boundary load to the end boundary of the helix, the displacement now goes out of plane, not just in the z direction. Does anyone know why this is happening/how to keep the extension only in the z direction?
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If the force resultant is not at the center of the helix, it will bend, since you implicitly apply a moment. With a prescribed displacement, you force it not to bend.
-------------------Henrik Sönnerlind
COMSOL