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How to select a singular point for fixed constraint boundary condition?
Posted 20 janv. 2026, 13:02 UTC−5 Geometry, Structural Mechanics, Modeling Workflow Version 5.5 3 Replies
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Hello,
I am simulating a battery model in 2D that involves multiple concentric circles and shells to build the geometry. I am using the Structural Mechanics module and seek to model the deformation in this 2D battery model.
I am trying to apply a fixed constraint boundary condition to prevent rigid body motion. Ideally, I would like to apply the fixed constraint boundary condition on a singular point on the outer shell of my 2D battery model, however I can't find a way to do so. At the minimum, I'm only able to have a quarter of my outermost shell undergo fixed constraint - not a singular point as I seek to do - and this conflicts with the underlying physics of my system.
Any input would be greatly appreciated.
Best, AU
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Constraining a single point to have no displacement would not be enough to remove all rigid body motions, even in 2D: the rigid body rotation around that point would still be unchecked. In 2D there are 3 rigid body motions, so you need at least 3 constraints on points to eliminate all three of them. For instance, you could restrict two points on the y=0 axis to have zero y displacement and one point on the x=0 axis to have zero x displacement.
Best,
Jeff
-------------------Jeff Hiller
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Hello Jeff,
Thank you for your response. I understand your approach for preventing rigid body motion and will apply the framework. However, I am still unsure how to restrict individual points as I can only select arcs on my geometry (consisting of concentric shells) for the fixed constraint boundary condition.
Best, AU
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Just check the point constraints.
-------------------Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
