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# Applying Periodic Boundary Conditions(PBC) in Abaqus

Thu, 2014-03-20 23:55 - bernad

Hi all,

I am looking for some reference on procedures for applying PBC in abaqus? I coud find some journal articles for the equation, but I am unaware of applying this into Abaqus under displacement laoding conditions..

any help in this regard would be appreciated greatly..

Thanks,

Bernad

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## Comments

## Dear bernadI'm working

Dear bernad

I'm working on multiscale modeling analysis usingg abaqus like you and i'm also beginner in abaqus but during my researches i found the way that the PBS ca nbe implemented in abaqus. af first you should define some sets of the boundary nodes from toos menu-> set->creat. then you should use the constraint menu and create constraine eqation between the corresponding nodes. for this purpose go to interaction module the use constraint menu-> create constraint and then select " Equation ". In the open dialoge you can implement any linear relation between selected nodes displacement!!!!

## Dear Afallah,

Dear

Afallah,

Thanks for your reply and I could

understand the basic steps in Abaqus for applying the PBC. However, I am

unaware of the constraint equation, incase of displacement control loading. The

constrain equation will have three components and third is just a constant (for

instance, Ax-Bx=0.004). In this case, I need to use dummy node, If am right.

Next, I would also like to know, can the constraint equation be applied for

two node sets corresponding to parallel surfaces? Because it can save lot of

time in comparison to constraint each node pair.

Thanks,

Bernad

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## Dear Bernard

Dear Bernard,

i am trying to apply PBC in a 2D RVE and having the same question that 'instead of

constraining each node pair in the opposite side can we just make a Node set and apply boundary

condition on that set'.

so what did you do with your problem ?