Probability-Damage approach for Fail-Safe design Optimization under Aleatory Uncertainty (β -PDFSO)

Abstract

[Abstract] The fail-safe design philosophy aims to achieve safe designs under the different accidental scenarios that structures might undergo throughout their lifespan. The Probability-Damage approach for Fail-Safe Optimization (PDFSO) led to an improvement over the traditional multi-model optimization strategy, since it takes into account the available data on the probability of occurrence of each partial collapse and allows the designer to assume certain risk over the damaged configurations less likely to occur. However, that methodology can be improved considering the inherent uncertainty in some random parameters such as loads or material properties. The objective of this research is to formulate a PDFSO approach including this randomness and therefore, obtain more reliable designs. Two application examples were considered: a 2D truss structure with stress constraints as well as the tail section of an aircraft fuselage with stress and buckling constraints.