How to apply forces/constraints to areas on bone
Altair EmployeeI am trying to model the forces applied upon a Jaw, in a simplified study. I am trying to pick a small surface area on the bone where the muscle attaches, to model the force. In the picture screenshot you can see the blue area where the muscle 'insertion' is. This is approximately the surface area I´d like to select. I´d like to map this area onto my solid mesh in hypermesh and then apply a force to it. There are other constraints in the model that require a surface area to be constrained (such as the top surfaces of the molar teeth) but if I can do one then I can do them all. I´ve tried using surface edit, solid edit, etc with no luck. Perhaps I am doing them wrong.
If anyone knows how to do this, providing simple steps would be very handy as I don´t have much experience with HyperWorks and the userface is pretty trickey. I plan on using OpiStruct for analysis after.
I´ve looked all over the internet with no luck so far
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Answers
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Hi GeorgeB,
When say you have used solid edit, surface edit.. does this mean that you are trying to trim the solid/surface to the blue intersection shape?
Why not create another component and organize the elements that falls under the intersection area and apply loads?
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I have attempted to do that except with nodes instead of elements, but my problem is that I´m not sure if the software is capable of selecting a surface area. I can obviously select individual surface nodes one at a time, but this would obviously take a long time. I´ve also managed to select many nodes in a line by using the 'by path' function of selecting nodes (which is effectively 1 dimensional). But is there a function for selecting a 2D surface area on the outer surface of the bone?
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You can select your entities ' by face ' i.e. select a node > click on the entity selector (nodes, elements etc the yellow button) > then choose by face
Use the feature angle tolerance in Preferences > Mesh
The feature angle tolerance specifies the maximum distance that the selected entity must be within to be included in the selection. When you select entities by face, attached adjacent surfaces or elements are progressively selected as long as the angle between them is less than or equal to the feature angle.
Of course experienced users can do this by manipulating the model and masking irrelevant elements to the load application manually,
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For all those trying to do the same, this is how I managed to select a surface area of nodes: Right click in command window > create > set. Change the card image to MBPCRV then click on '0 nodes' > nodes (yellow). Now go to your surface and hold shift + left click. You can choose to pick a square, circle or polygon surface area of nodes! For some reason this wasn't mentioned in the introductory tutorials
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I have a similar project, that includes the application of muscle forces on bone areas. I am currently wondering how to distribute the force best.
Is it a good idea to apply the force via RBE3 Elements with an calculated independent node and a cbush element or do you suggest another way?0 -
Altair Forum User said:
I have a similar project, that includes the application of muscle forces on bone areas. I am currently wondering how to distribute the force best.
Is it a good idea to apply the force via RBE3 Elements with an calculated independent node and a cbush element or do you suggest another way?can you explain the use of cbush elememt more detail(forgive my poor English)
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