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Minimaze Mass Analysis with SF

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I've done a Topology Optimization of a steel node, the material set is Steel S355JR.

Running the analysis with Minimize Mass and SF = 1,05 I would expect a maximum value of no more than 355MPa*1,05= 338 MPa.

The tensions obtained however exceed this value.  1048 MPa.

Someone can help me to understand, please.




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