8 Replies Latest reply on May 13, 2015 8:03 PM by Jared Conway

# Symmetry issue

hi guys,

I have some problems with making a symmetric form..

You see that the displacement is unrealisticly asymmetric so the model has some symmetric issues.
When I use the evalution tool symmetry on the assy i got this results

So the top and de base are asymmetric..
But when in open the parts themselves and then when i run a symmetry check( im using the same reference plane) both part are labelled symmetric..

Any ideas?

• ###### Re: Symmetry issue

Well, it would be difficult to troubleshoot over the internet. But you could be analyzing 1/4 of this model. Look at it from the top and draw a plus-sign through the two planes of symmetry. Optionally, you could split the bodies using the front and right planes if the jack is drawn symmetrically. Then enforce symmetry boundary conditions on the cut planes, apply 1/4 of your load. Voila! Your problem should be solved without even knowing what it was

You can also do some things like put 1 g acceleration on the part to verify that the reaction equals the part weight.

• ###### Re: Symmetry issue

You are causing confusion by starting new threads on the same discussion.

Stick to on thread with one problem to avoid confusion.

or link the reference to previous discussion

• ###### Re: Symmetry issue

Have you double checked if your materials applied are in correct order? Also do check if your contact sets are correct.

• ###### Re: Symmetry issue

as i mentioned in the other thread, use a quarter or half symmetry

but my guess is that you have chosen "small displacement" solution and therefore are getting bad results

if you use a bonded contact set instead of no pen and bolts/pins, you'll be much better off

• ###### Re: Symmetry issue

Yes but that isn't realistic.. Or is it?

• ###### Re: Symmetry issue

Yes, it's realistic.

• ###### Re: Symmetry issue

are you talking about symmetry? do a test with a block, the results are the same

regarding bonded, right now you're trying to get results, that is the best way to start and my guess is that it is close enough for what you're doing