optistruct

abhijeet borade
abhijeet borade Altair Community Member
edited October 2020 in Community Q&A

what is purpose of minimum member size and maximum member size used in topology optimization parameter ?

 

Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2017

    There are two parameters related to size in Topology Optimization, namely 'Minimum Member size & Maximum Member size'

     

    One challenge with post-processing topology optimization results is that the results may have several intermediate density elements or checkerboard patterns which can be interpreted either as solid members or as a void. If these semi-dense elements are interpreted as thin members, the final design is harder to manufacture.

     

    OptiStruct offers the Minimum & Maximum Member Size control method which provides some control over member size in the final topology designs by defining the least & maximum dimension required in the final design. It helps achieve a discrete solution by eliminating the intermediate density elements and checkerboard density pattern, resulting in a discrete and better-reinforced structure, which is easier to interpret and also easier to manufacture.

     

    Guide lines for Member size values -

     

    1. Minimum Member Size 

     

    It is recommended that the MIN-DIM value be

     

    a) 3 times the average element size for proper mesh alignment

    b. 2 times the average element size if mesh is not properly aligned.

     

     

    2. Maximum Member Size 

     

    The MAX-DIM value will be 2 - 2.5 times MIN-DIM value  (Minimum Member Size)

     

     

     

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