Constraints and BC in HM

Altair Forum User

Dear all,

 

I am a newbie in HW as well as HM and aim to setup a component and then perform the analysis with Optistruct. I have defined my BCs and constraints using RBE2 elements but face some issues. (HM model and image with BCs attached)

 

1. I am not sure about how to define a displacement BC or Constraint on one of the holes (left end in the attached image).  Aim is to constraint the sideway motion (x-axis) of the component to max of 2mm. I created a constraint load collector with load type SPCD and activated dof1 with a value of 2mm. Is this the correct way to implement the desired constraint? 

2. Secondly, I created  linear static loadcases with option Load for my load collectors FRONT, CENTER, REAR and SPCD.  Is it required to create a separate loadcase for Symmetry BC as well?

3. I assume a (geom. non-linear) dynamic implicit type load step will be better to use in this case. But I am unsure which sub-option I have to use in that case.

 

Some suggestions and recommendatiosn woudl be really helpful.

I.

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Altair Forum User

I am not sure about how to define a displacement BC or Constraint on one of the holes (left end in the attached image).  Aim is to constraint the sideway motion (x-axis) of the component to max of 2mm. I created a constraint load collector with load type SPCD and activated dof1 with a value of 2mm. Is this the correct way to implement the desired constraint? 

 

I think for this you need to optimize the model such that the displacement is restricted to 2mm. 

 

I see you have an SPCD and forces coming on to the node which is not correct. 

 

Also, I dont see any SPCs refered in load cases. Is there a reason for that?