Rigid Dynamics

- December 8, 2019 at 5:24 pm
  
  bytt
  Subscriber
  
  Hello everyone. I am new in Ansys. I need to simulate a powder mixer and see the forces at the joints. could anyone help me?
- December 10, 2019 at 2:33 am
  
  peteroznewman
  Subscriber
  
  How many rigid links do you have? Does that equal the number of bodies in the CAD model? It's best to use CAD to unite bodies that are part of the same rigid link to avoid creating a lot of Fixed Joints to connect those bodies together.
  
  Do you have a definition of what type of joint is at each end of each rigid link?
  
  Did you start a Rigid Dynamics model yet?
  
  Do you only need results at one configuration of the rigid links?
  
  Do you know the correct mass of each rigid link?
  
  Are there any springs in the system?
  
  Does one of the links represent a frame fixed to ground, or will the ends of some links have a body-ground joint so ground is not physically represented by any body?
- December 17, 2019 at 9:22 am
  
  bytt
  Subscriber
  
  I used the transient structure. But why the stress is too high?
- December 17, 2019 at 5:45 pm
  
  peteroznewman
  Subscriber
  
  If you have a sharp inside corner that is being pulled, the theoretical stress value is infinity.
  
  Add a blend radius to all inside corners to eliminate the infinite stress problem.
  
  https://www.youtube.com/watch?v=ZP9nh4GOkIc
- December 18, 2019 at 12:00 pm
  
  peteroznewman
  Subscriber
  
  You said you wanted the Forces in the Joints.
  
  I said to build a Rigid Dynamics model.
  
  You have built a Transient Structural model and are asking about Stress in the parts.
  
  Did you get the Joint Forces you originally asked for?
  
  Did you get that from a Rigid Dynamics model?
  
  What type of connections did you make between the parts?

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