labile model in marc

[SOLID]

Hello everyone,
I have a problem in performing a marc contact analysis of a mathematically labile model.
In practice I have to replace my mathematical constraints with surfaces and the solutor, rightly, gives me a mistake saying that the model is labile and it is not possible to reverse the matrix of rigidity.
ideas to solve the problem?

 

[MacGG]

Hello solid,

I don't understand the problem, but did you create contact bodies?
how are you controlling them (in position, in speed, in force)?

If you do this maybe you solve your problem.

Hi.

♪

 

[SOLID]

I created a rigid body controlled in strength and a deformable.
at the control node of the rigid body I blocked the three translations (I did not set theauxiliary node as I do not care about rotations), while to my deformable body I imposed only a load.
I also imposed the initial contact. the solutor not seeing bound the meshato body gives me error saying that body is labile and it is not possible to reverse the matrix of rigidity.
specific that inverting the problem, that is by binding my deformable body and by controlling with a force or a shift the stiff body the simulation goes.
But that's not what I want to simulate.

 

[MacGG]

Hello solid,

Okay, so how about we put some ground springs with minimal stiffness to remove the various lability?

It is true that it is not reality, but if there are no equivalent solutions, this should still solve the problem.

Hi.

♪

 

[SOLID]

Hello, macgg,
thanks for the suggestion, now I can make the calculation run correctly.