Reliable design optimization of a cantilever beam structure by using Dirlik fatigue approach

Abstract

Reliability-Based Design Optimization (RBDO) is a widely used approach for optimizing engineering structures, but it often neglects the effects of fatigue. In this article, we propose an RBDO methodology that combines the Reliability Index Approach (RIA) with Dirlik spectral method for fatigue damage assessment. The RIA approach is utilized to estimate the reliability index (RI) of the structure, while Dirlik fatigue approach is employed to assess the fatigue damage. Fatigue damage is introduced as a hard constraint in the optimization process. A case study is presented to demonstrate the effectiveness of the proposed methodology. The results show that the RBDO approach, incorporating fatigue phenomenon using RIA and Dirlik spectral method, can lead to reliable and fatigue-informed optimal designs for enhanced performance and durability of cantilever beam structures. Further research can explore the applicability of the proposed methodology to other types of structures and loading conditions.