I have an assembly of 9 parts and 16 bolt the computer takes
more than 10 hours and it only achieve 20% in solving contact
constraints. the contact is bonded and no penetration.
I have a cor 2 duo with 2 giga ram , windows vista SP1,
SW2008 SP 5
my problem is that it take more than 8 hours and it never continue
only 20 % on solving contact constrains. I know there is something
wrong with the contact but I don't know it. I tried each two parts
only and it takes no time but when i try all of them together it
never works. I don't know what is the problem the mesh is ok and
restrains is ok but the contact is not. If any one have any advise
I will be so greatfull.
Thanks,
In my opion something si moving. Run a very corse mesh with
draft elements, use the FFE solver and show the convergence plot.
IF it is not running nicely down hill it is typically a good
indication that something is moving.
I would attached an elastic support to every part or ones that you
may have a suspicion may have unrestricted DOF's. Just use some low
stiffness relative to the problem. This will get you a solution
eventually and then you can see what is moving. Remember if things
are not strictly conincident they will not get the default bonded
connection or whatever is specificed as the default if not a
bonded.
Alternatively, you can set the default to free and manually apply
all contacts pretty easily usig the select contacts option.
In my experience, this does not look like a software issue but a
restraint issue. FEA is a stiffness based method so things need
tohave some stiffness or things don't converge very quickly or not
at all.
Also in the solver options check the apply soft springs and this,
while a bit slow, will usually get you an answer so you can see
what is moving.
Also the contact iterations are not vectorized so you would see low
CPU utilization if it is spending a lot of time on the contacts.
The solvers are vectorized for the stiffness matrix inversion.
What are your computer specs?
What is your question?
Cheers,