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The selected Stress Goal is the overall goal for the optimisation and has a big influence on the resulting design. The target is that the material of the part is evenly loaded and the stress uniformly distributed. Thus, the Stress Goal isn’t the maximum stress which can occur at Design Space limits or due to FE singularities, but the value which is a good middle value for a long part life (green areas in the example above). Not in every case the yield strength of the material is the best value for this parameter, e.g. when the applied loads are too small to result in such stresses. By changing the Stress Goal, the stiffness of the structure can be influenced as well. Due to uniformly distributed stresses, lower Stress Goals result in stiffer parts at the most lightweight design. A safety factor can be introduced by considering this factor in the Stress Goal value. The user needs to take into account if a safety factor is needed and adjust the Stress Goal accordingly.
The used Stress Goal is dependent on the resolution level during the optimisation. The optimisation runs on different resolution levels and switches between them to achieve the best results. The first iterations are calculated on a coarse resolution level. With rising number of iterations, the resolution gets finer. This means that the first iterations calculate much faster than the last iterations but aren’t as detailed as the last. With the increasing resolution, the size of the output data, the calculation time as well as the surface quality increase.
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