Non-Linear Transient Analysis

[thesiswork]

Hello everyone, I am trying a non-linear transient analysis for my thesis project. I have tried different setups for my model but it does not work.
My task is to compare my model with the test data. I have 6 plates whose dof I can control by using general constraint. In these 6 plates for now 5 are completely constrained. One of them is constrained only in (Z, Rx, Ry, Rz), so the plate is free to move in (X, Y). In that plate, I am applying enforced motion (ACCE) in X and Y direction. That scenario does not converge.

I also tried freeing all the dofs (X, Y, Z, Rx, Ry, Rz) and apply enforce motion (ACCE) in (X, Y, Z) but again it diverges.

However, when I contrain (X, Z, Rx, Ry, Rz) and keep (Y) free and apply enforced motion (ACCE) in Y direction, the solution converges.

 

[GregLocock]

I am unfamiliar with the cartooning software you are using, but for the life of me I cannot see where X Y and Z are defined in the pretty pictures.

Cheers

Greg Locock


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[thesiswork]

The cartooning software is MSC Apex.

 

[thesiswork]

Here is more clear picture of the model. I pointed out the origin and the plate. The plate, forces and origin has same X Y and Z direction. I hope it more more clear now, if not let me know.

 

[NRP99]

This is dynamic simulation but I am not able to understand how the problem is setup. You need to provide more information.

The dynamic analysis can be run without requiring normal constraints like in static analysis where we want to arrest rigid body motions and attain static equillibrium.

 

[thesiswork]

Yes, I can. Firstly, as seen above in those picture there six plates. The one which I have pointed it is constrained in (Z,Rx,Ry,Rz) and free in (X,Y). In the same plate, Acceleration is applied to a node in (X,Y) direction. The remaining five plates are fully constrained in translational and rotational direction. Those plates are than attached with click-in via RBAR connection. The click-in and the frame are glued together via glued contact option in MSC Apex.