How to set lower/upper bound defining dconstraints

Altair Forum User

Hello,

 

I have defined dconstraint for my free size and size optimization of my composite layup. there I am trying to reach a maximum displacement of 0.7mm. With this, I am not sure what bound to set, in order to get a sufficient displacement solution. 

 

Can you hell me out with this problem?

 

THank you in advance for your help.

 

Kind regards

 

Dean 

Altair Forum User

Hi Dean,

 

Please let us know the following details:

 

1) Is the displacement constraint 0.7 mm is the total magnitude or in a particular direction like X, Y or Z?

2) if this is in a particular direction then is it in +ve or -ve direction of that component?

 

For example if you are trying to restrict the displacement of a node in +Ve X direction the you can give a upper bound of 0.7mm in your constraint.

Altair Forum User

Hi Prakash,

 

I am trying to restrict a displacements total magnitude of 0.7mm. If I am setting the lower bound 0.7 I don't get the solution I am looking for and the laminate does not fulfill the needed design objectives. I started with the same geometry, but only with aluminum selected as material. After analysis I detected a displacements magnitude of 0.7mm. That's how I selected my disp-design target. 

 

Kind regards

 

Dean 

Altair Forum User said:

Hi Dean,

 

Please let us know the following details:

 

1) Is the displacement constraint 0.7 mm is the total magnitude or in a particular direction like X, Y or Z?

2) if this is in a particular direction then is it in +ve or -ve direction of that component?

 

For example if you are trying to restrict the displacement of a node in +Ve X direction the you can give a upper bound of 0.7mm in your constraint.

Altair Forum User

Altair Forum User said:

Hi Prakash,

 

I am trying to restrict a displacements total magnitude of 0.7mm. If I am setting the lower bound 0.7 I don't get the solution I am looking for and the laminate does not fulfill the needed design objectives. I started with the same geometry, but only with aluminum selected as material. After analysis I detected a displacements magnitude of 0.7mm. That's how I selected my disp-design target. 

 

Kind regards

 

Dean 

Dean,

 

Maybe you are looking at total displacement constraint. Try with upper bound of 0.7mm. This means the node cannot move beyond 0.7mm

Altair Forum User

Hello,

 

I try to define a constarined that x and y direction is fix and   max displacement along +-z direction is +-4 mm . How to define that condition? 

 

Thanks

Altair Forum User

Hi Nihan,

 

Keep an upper bound of 4 mm in Z direction. 

 

First you create a displacement response, select the node(s) and component to constrain. Then go to Dconstraints panel to create a constraint. 

Altair Forum User

Hello Prakash,

 

Thank you soo much /emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />