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pierre replied to the topic Pre-deformed beam in the forum Using SOFA 3 weeks, 5 days ago
Hi Hugo
Thanks, it works. I load a hexahedron gmsh mesh and specify the rest position coordinates in the scn file, then I use either a HexahedronFEMForceField or a TetrahedronFEMForceField.
Unfortunately I cannot figure out how to properly define a collision model for this deformable object. Whatever I tried has caused crashes so far. Is there…[Read more] -
pierre replied to the topic Pre-deformed beam in the forum Using SOFA 1 month, 4 weeks ago
Hi Hugo,
not exactly, sorry it was not clear. I am now considering a problem in one step only.
I would like to load the deformed shape only (volumetric mesh), and define a MeshSpringForceField which would be aware of all the rest edge lengths (those of the beam in its – straight – rest position). Initial forces would be derived from these…[Read more] -
pierre replied to the topic Pre-deformed beam in the forum Using SOFA 1 month, 4 weeks ago
Hi Hugo,
I’ve thought about an alternative process but I cannot find the appropriate method:
I would like to load the deformed beam as a mesh (obj), and define a MeshSpringForceField (or something similar) whose initial parameters represent the pre-stress. I guess this could be fully determined by the contraction/elongation values of each edge,…[Read more] -
pierre replied to the topic Pre-deformed beam in the forum Using SOFA 1 month, 4 weeks ago
Hi Hugo,
thanks
The deformation is actually such that none of these methods is actually a solution. I need to reconsider the whole problem I guess.Pierre
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pierre replied to the topic Pre-deformed beam in the forum Using SOFA 2 months, 1 week ago
Hi Hugo,
Thanks, that’s interesting. I think this could work, but unfortunately the QPL license of the plugin may become a problem at some point.
I am surprised there is no simple way to specify a constraint as a series of target positions for a subset of the input vertices. I find no example with FixedTranslationConstraint.Best regards
Pierre -
pierre replied to the topic Pre-deformed beam in the forum Using SOFA 2 months, 1 week ago
I guess the solution is in the use of FixedTranslationConstraint. I will try to follow this way.
Best,
Pierre -
pierre replied to the topic Pre-deformed beam in the forum Using SOFA 2 months, 1 week ago
I like this two-step approach. I think it is suitable in my case, I just ignored one could specify a target deformation state defined by vertex-wise positions. Could you please provide a link to an example scn?
Best,
Pierre -
pierre replied to the topic Pre-deformed beam in the forum Using SOFA 2 months, 1 week ago
Hi Hugo,
Thanks for your quick answer.
Yes you understood correctly: this is a pre-loaded beam. In my case the end configuration is actually not stress-free, but this beam will have to find its position into a rigid object (collisions included). But the real rest geometry of the beam is actually known, its is just straight, fully defined by some…[Read more] -
pierre started the topic Pre-deformed beam in the forum Using SOFA 2 months, 1 week ago
Hello everyone,
I would like to know if/how this can be done with SOFA:
I need to consider a straight beam (e.g. as defined in BeamFEMForceField.scn, or with a loaded input mesh and a HexahedronFEMForceField) whose initial deformation would be fully defined by its vertex positions. I want to simulate the behaviour of the beam once…[Read more] -
pierre became a registered member 2 months, 1 week ago