Application of 1D iFEM to an Experimental Beam Model with Degrading Boundary Conditions

Abstract

The inverse Finite Element Method (iFEM) is a robust computational technique that utilizes a network of strain sensors to reconstruct full-field displacement on beam or shell structures. Importantly, the method is independent of specific loading conditions and material properties, making it particularly suitable for real-time structural monitoring and assessment. By providing a comprehensive understanding of structural behaviour, iFEM enables the implementation of condition-based maintenance policies, which are crucial for enhancing the operational lifespan of engineering structures. This study evaluates for the first time the effectiveness of 1D iFEM strategy in shape sensing of an experimental beam structure with degrading boundary conditions. In addition, a dedicated procedure has been implemented to reconstruct the percentage reduction in the stiffness of the degraded constraint, which is essential for structural health monitoring and for defining appropriate retrofitting strategies to be applied to the structure. The results show the potential of iFEM for structural health monitoring and adaptive maintenance strategies in real-world applications, where boundary conditions may evolve over time.