Learning Forum

[M210098]

Hi,

I am currently attempting a simulation tutorial by Ansys. 

Link: https://innovationspace.ansys.com/courses/courses/structural-boundary-conditions/lessons/practice-quiz-and-simulation-exercise-5/quizzes/simulation-exercise-structural-boundary-conditions/

However, I am having difficulty setting the appropriate boundary conditions. From my knowledge, to enable the bracket to slide, compression-only support would be useful and to rotate the bracket, should I insert a remote displacement? As for a cylindrical support, in this question's context, it is not useful right? As the rigid shaft is not exactly having an effect on the bracket? May I clarify the above queries with you? Thank you. 

[Erik Kostson]

 

 

Hi

’The steel bracket below has rigid shafts (purple) through holes A and B that fit snugly, where there 
is no clearance, but the bracket can slide or rotate with the rigid shafts (cylindrical support – fix radial). Another shaft goes through 
hole C (brown) and exerts a total of 10,000 N in the negative y-direction (remote force or like it says bearing load). Only the green bracket 
will be analyzed in this simulation.'

All the best

Erik

 

 

[Erik Kostson]

 

Hi

 

Also the supports cylindrical support – fix radial and frictionless are the same here so that is the hint for one question.

 

[M210098]

 

Hi,

I have tried out the methods which you have advised:

Compression-only Support for frictionless contact and Cylindrical Support (fix radial) and apply bearing load of 10000N in y-direction.

However, I am not able to obtain the total deformation of 0.06mm. May I just confirm if my steps are right? Thank you. 

 

[Erik Kostson]

Hi

It is a tricky one.

So as we said use frictionless support on A and B.

For the force it should be in neg., so - y direction (not pos.) .

Also it should be -5000 N (so half the force) since we use 1/2 symmetry :) - this is the tricky part.

With that we get the correct results.

All the best

 

Erik

[M210098]

Hi, 

Sorry for the inconveinance again. If I only apply compression-only support (for frictionless contact), bearing load (-5000 in y direction) and cylindrical support (fix radial), I would end up arriving at the answer of only 0.2 mm instead. I had tried applying frictionless support instead but that resulted in a solver pivot error. May I clarify this with you again? Thank you. 

[Erik Kostson]

 

 

 

Hi

Do this since that works fine:

So as we said use frictionless support on A and B.

Sym.: Z in XY face (face that is on the sy. plane) as said in the pdf.

Use Structural Steel material,

For the force it should be in neg. y, so – y direction (not pos.) . Use components x=z=0, y=-5000 N for bearing load and not vector. 

So the displacement should be down in – y (not up in pos. y)

With that we get the correct results.

All the best

 

Erik