Rinto Roy

1 INTRODUCTION Structural health monitoring (SHM) has gained significant interest in recent decades, with a variety of methods proposed to investigate existing structures and identify damage. Among these, vibration-based methods are highly applicable because of their non-intrusive nature and ability to detect structural issues with high sensitivity.

Abstract : This work presents a novel methodology for the accurate and efficient elastic deformation reconstruction of thin-walled and stiffened structures from discrete strains. It builds on the inverse finite element method (iFEM), a variationally-based shape-sensing approach that reconstructs structural displacements by matching a set of analytical and experimental strains in a least-squares sense.

4.2. Skin-Spar Debond Detection The iFEM reconstructed strains are processed using the SEA to establish a healthy baseline, and subsequently to compute the damage index ( κ p = κ x ). The contour plots of iFEM reconstructed curvature and the damage index over the top skin for damage case 1 are shown in Figure 17. The results indicate two damage index peaks at the debond junctions, corresponding to the locations of high curvature gradients.