Constraints for sum of saved shapes

Unknown
Unknown
edited October 2020 in Community Q&A

Is there a way to introduce a design constraint for node movements with shape optimization when there are multiple shapes defined for the same set of nodes?

 

To be more precise, I want to find an optimum shape for a large set of nodes (that's why shape, not free shape optimization) to minimize the max stress in the area, where a crack is to be removed by 3D-machining. I want to use multiple shapes (like linear, quadratic, cubic,... generated by HyperMorph), but the sum of the node movements should always be inwards to the material (i.e. no added material,  individual shapes could protrude as long the sum of the shapes is inwards at every node).

 

I have explored the manual a bit, and there seems to be commands like DRESP2 and DEQATN, which look promising, but I don't have any experience on those (and quite little also on optimization). Could someone tell directly, if its not possible or if there is no benefit over free shape -optimization?

 

BR

Lassi

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited May 2019

    Please refer the attached material for free shape optimization & also if you have access to a newer version of OptiStruct 2017.2.2 or above try for corner stress response for minmax of corner stress.

    Unable to find an attachment - read this blog

  • Unknown
    Unknown
    edited May 2019

    Thanks Rahul, probably the free shape method is the only possibility in this case.

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