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A Failure Criterion value of 1 is always the objective of the optimisation. Four different types of Failure Criteria are available (von Mises Stress, FFF Thumb Rule, Directional Dependent Tsai-Hill or Tsai-Wu). More information regarding the Failure Criteria here.
The Safety Factor calculates the goal for the optimisation in regard to the material properties (material limits) for the chosen Failure Criterion. The following two examples show how the goal for the optimisation is calculated:
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In one optimisation several Events (load cases) can be considered. Each Event is calculated by itself and the stresses / Failure Criteria of all Events are enveloped and the highest value for each area is considered. For information regarding the Event Specific Safety Factor have a look here.
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For further information regarding the stresses and Failure Criteria in the Post Processing, have a look here.