Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Symmetric Stress ,Without Fixed Constraint
Posted 28 janv. 2015, 15:20 UTC−5 Studies & Solvers, Structural Mechanics Version 5.0 2 Replies
Please login with a confirmed email address before reporting spam
Hi guys,
I have a symmetric structure which is imposed by symmetric stresses , and i wanna know the displacement of top point of this model without any fixed constraints.
But it cannot be solved ,says
"Failed to find a solution.
The relative error (2.8) is greater than the relative tolerance.
Returned solution is not converged.
- Feature: Stationary Solver 1 (sol1/s1)".
Does anyone have any experience on this kind of model? I don't wanna add fixed constraints, cause it is the most similar one to real situation. Is it possible?
Thanks for any help.
Emma
I have a symmetric structure which is imposed by symmetric stresses , and i wanna know the displacement of top point of this model without any fixed constraints.
But it cannot be solved ,says
"Failed to find a solution.
The relative error (2.8) is greater than the relative tolerance.
Returned solution is not converged.
- Feature: Stationary Solver 1 (sol1/s1)".
Does anyone have any experience on this kind of model? I don't wanna add fixed constraints, cause it is the most similar one to real situation. Is it possible?
Thanks for any help.
Emma
2 Replies Last Post 28 janv. 2015, 17:23 UTC−5
Please login with a confirmed email address before reporting spam
Posted:
10 years ago
Emma,
you could try to use Prescribed Displacement BCs to achieve a well defined model. Set the component with minimum effect to the load situation to zero.
If the structure, loading condition and deformation is really symmetric you can take advantage of the symmetry. There might be a neutral plane that can be used for Prescribed Displacement without loosing any detail.
Cheers
Edgar
--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
you could try to use Prescribed Displacement BCs to achieve a well defined model. Set the component with minimum effect to the load situation to zero.
If the structure, loading condition and deformation is really symmetric you can take advantage of the symmetry. There might be a neutral plane that can be used for Prescribed Displacement without loosing any detail.
Cheers
Edgar
--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Please login with a confirmed email address before reporting spam
Posted:
10 years ago
Hi Edgar,
Thanks for your reply.
I made a simple rectangular block as example, and tried to set Prescribed Displacement on two sides (opposite) with X:0.2mm, y:0mm, z:0mm and X:-0.2mm,y:0mm, z:0mm. The dimension of the cuboid is :L=10mm, W=0.1mm, H=0.1mm. I thought it may easier to understand and get the data of displacement of center point.
But still has the same problem. Still don't wanna use the fixed constraint.
Oh... I made the structure directly without setting a axis. Maybe it is the problem, isn't it ? I'll have a try.
Regards
Emma
Thanks for your reply.
I made a simple rectangular block as example, and tried to set Prescribed Displacement on two sides (opposite) with X:0.2mm, y:0mm, z:0mm and X:-0.2mm,y:0mm, z:0mm. The dimension of the cuboid is :L=10mm, W=0.1mm, H=0.1mm. I thought it may easier to understand and get the data of displacement of center point.
But still has the same problem. Still don't wanna use the fixed constraint.
Oh... I made the structure directly without setting a axis. Maybe it is the problem, isn't it ? I'll have a try.
Regards
Emma