# ElineH

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7

1. ## solver algorithms Topology Optimization

Hi I looked in the documentation but don't succes to make up my mind: Which are the solver methods used for topology optimization? I found that solvers used are -MFD -SQP -DUAL and DUAL2 -BIGOPT But in the beginning of the user manual Altair also talks about the optimality criteria method but in the manual I can not find anything about it. Which is the default solver for topology optimization and which others optimization algorithms can be used to solve a topology optimization problem?
2. ## creation stiffness matrix

Hi, I was wondering how the creation of the stiffness matrix is defined. I don't mean how I implement it but I mean how OptiStruct knows how to generate a stiffness matrix. I was looking in the documentation for this but couldn't find it. Can someone help me? Thank you
3. ## Documentation Optistruct

Hi, I am curious about the algoritms and codes used in OptiStruct and all the possibilities of the software. Does anyone know if there is some documentation about this and where I can find it?
4. ## stress constraint in design variable vs. as constraint topology optimization

Hi, Thank you for your answer What I don't really understand is what the global stress constraint exactly does in topology optimization. In the above definition you mention it ignores local stresses that are too high but what is the point of using the stress constraint then? Your local stresses will still be too high. What is exactly meant by 'artificial stress concentrations' because as I understood the global stress constraint makes sure they are below the limit (declared in the global constraint) but I don't get what they exactly are.
5. ## stress constraint in design variable vs. as constraint topology optimization

Hi, I know this question is already asked multiple times but I still haven't fully understood it. What is the exact difference when I define my stress constraint in the design variable of topology optimization or when I add it as a response and then a constraint of the optimization. When I add it in the design variable, without any other constraint it doesn't do anything (see attachment). Opposite to when I define it as a response and constraint. Then it does give results, although not very good ones. When I apply them both on one design, it gives a different result then when I only apply one of them 2. I do topology optimization of a hook with a minimum compliance and no other constraints or requirements. thank you!
6. ## finding displacements of optimized structure

Hi, It worked! Thank you
7. ## finding displacements of optimized structure

Hi, I am using HyperWorks 2019, student edition and am running a linear static analysis of a beam (topology optimization). I would like to display the displacements and stresses in the optimized structure. I found a tutuorial that could just go to a second page in hyperview where for each iteration the stresses and displacements could be visualized. I just have one tab that displays the densities (since in did a min compliance problem with volumefraction constraints). Does anyone have an idea about how to view the displacements? Thank you in advance!
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