Isight - Abaqus - how to constrain variable?

[csgut]

Hi, I am new in Isight, but with help of the internet I prepered optimization procedure in Isight for Abaqus simulation to obtain suitable material data. My matial is viscoelastic (Prony series). And my question is - how to constrain variable with respect to other variable value?

Easy example: in inp file I have 2 parameters x1 and x2, both of them could be from 0 to 1. I can do it in optimalization setting with value bounds, but I haven't found how to prescribe condition like: x1 + x2 < 1 ...
So I want to have: x1 and x2 = (0,1) AND x1 + x2 < 1.

Thank you for any advice.

 

[FEA way]

I think that you could just use the Calculator component for that - to create a new parameter defined as a sum of x1 and x2. Then you should be able to set the range for that new parameter as well.

 

[csgut]

Thank you for your response. After getting OS disc alive again, I will try it. But first attempt before crash seemed to be working. I wouldn't think of using something called a calculator for that.

 

[csgut]

So, my PC is back. I tried it with calculator component, create new "parameter" made as sum of x1 and x2, setup "parameter" < 1 (upper bound of param. 0.999..), but during run it still attempt to solve job with "parameter" >= 1, which leads to error because of Abq solver.