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Matteo

Optistruct No forces applied but no zero displacement found

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Hi everybody,

 

I was running a test with optistruct using two simple cubes. They are both fixed at opposite ends. Their faces are separated by 0.1 mm and can, if pushed, become engaged in a contact (type SLIDE).

Type of analysis: nonlinear quasistatic.

 

Issue: Even if I fixed both cubes at their bases and there is no applied force and no contact is engaged (shcdist=0.001 and the solver warns me that no contact elements have been defined during the analysis), the cubes translate of 2 mm as if they are moving like rigid bodies.

 

I have already tried to constrain some more nodes, to no avail.

 

Any explanation for this thing by anyone?

 

Thank you in advance.

 

 

Find attached my .fem file to check

SHRCTOL001.fem

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15 hours ago, Matteo said:

Hi everybody,

 

I was running a test with optistruct using two simple cubes. They are both fixed at opposite ends. Their faces are separated by 0.1 mm and can, if pushed, become engaged in a contact (type SLIDE).

Type of analysis: nonlinear quasistatic.

 

Issue: Even if I fixed both cubes at their bases and there is no applied force and no contact is engaged (shcdist=0.001 and the solver warns me that no contact elements have been defined during the analysis), the cubes translate of 2 mm as if they are moving like rigid bodies.

 

I have already tried to constrain some more nodes, to no avail.

 

Any explanation for this thing by anyone?

 

Thank you in advance.

 

 

Find attached my .fem file to check

SHRCTOL001.fem

Hi @Matteo

You gave displacement of 2 mm in x-direction in SPC contraints. Kindly make it zero.

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