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The optimization calculates an approximated von Mises stress and shows these values in the postprocessing.
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In one optimization several Events (load cases) can be considered. Each Event is calculated by itself and the stresses of all Events are enveloped and the highest stress for each area is considered. For information regarding event specific stress constraints have a look here.
The stress calculation is from an FE point of view an estimation. That’s why we recommend a FE reanalysis using Apex Structures/Nastran to verify the results regarding all boundary conditions. For the reanalysis the intersected model should be used which will be manufactured and used. The reanalysis can also take dynamic loading & other boundary conditions into consideration that are not considered in the design process. For more information regarding intersection have a look here.