Modeling guided waves interacting with an arbitrary damage using SBFEM in combination with quadtree decomposition (vor Ort)
* Presenting author
SHM techniques associate strongly with damage detection and characterization. Ultrasonic guided waves (UGW), for such scope, arise as one promising methods for many reasons, i.e. UGW are able to travel long distances and they are easy to excite. In this context, the necessity to model realistic wave-defect interaction occurs to be critical.Introducing arbitrary geometries, i.e flaws in a computational domain is not trivial. Nevertheless, these realistic damage scenarios can be modeled through the usage of image-based quadtree meshes. Images such as the outcome from X-ray scans or ultrasonic C-scans can be converted into meshes for further integration into a model. Quadtree meshes are created by converting intensity of the pixels to quadrilaterals. Homogeneous regions inside one image result in one quad and features such as discontinuities are described with smaller quads.This contribution proposes an efficient methodology to model wave defect interaction, using as a framework the scaled boundary finite element method (SBFEM) and quadtrees. Problems as non-conforming regions in the mesh due to the space-tree decomposition can be avoided using SBFEM's polygonal elements. The Semi-analytical nature of the SBFEM allows the modeling of arbitrarily long prismatic regions of the waveguides without an increase in the computational burden.