Optimization using GA

Hello everybody,

I am completely new to Hyperstudy and I try to optimize the fiber orientation.

For this purpose, I modeled a square plate with 4 elements. For the boundary conditions I fixed one edge in x and z direction and the adjacent edge in y and z direction to allow contraction. Now I put an enforced displacement of 1mm in x direction.

What I want to do is to give each element a random fiber angle and then to optimize them so that all of the 4 elements are rearranged in x direction.

In Hyperstudy I parameterize the .fem file to create the 4 design variables (fiber angles). To define the responses I tried to read out the scalar compliance value so that I can use it in HyperStudy but I haven't found a solution yet.

As an alternative I try to read out the minimum element strain energy using the resvector function and the .res file and then maximize it due to the enforced displacement. But I am not sure if this is the best solution.

If anybody has a solution, I would be glad.

As a contraint I limit the element stresses.

Another problem is that during the optimization HyperStudy seems to automatically create bounds for the responses like +-10% which will always be violated and thats why optistruct crashes that often. 

Is there any possibility to delete or at least change these bounds?

Thanks in advance.