“Numerical methods and development of Imaging techniques for Structural Health Monitoring applications”, Dr. Christos Panagiotopoulos [Jul 23, 2019]

Tuesday 23 July 2019 16:00 – 17:00 Seminar Room 1

“Numerical methods and development of Imaging techniques for Structural Health Monitoring applications”

Dr. Christos Panagiotopoulos Institute of Applied and Computational Mathematics (IACM)

Research and development issues on material related to Structural Health Monitoring (SHM) worked during the ARCHERS project will be presented through a variety of related topics. First, an Operational Modal Analysis currently developed framework based on Stretching Method is examined and further applied to the case of the old Egyptian lighthouse of Rethymno. Using signal processing results within the Stretching Method framework we set up a minimization problem in order to appropriately define a simple mathematical model of the structure amenable for further numerical processes. Second, Time Reversal for Structural Analysis of frame structures will be covered in order to show whether it fits well as a numerical tool for source and damage localization problems. Another important issue of SHM is the Acoustic Emission that is the phenomenon of radiation of acoustic (elastic) waves in solids that occurs when a material undergoes irreversible changes in its internal structure. A mixed finite element method capable to simulate such problems of elastodynamics has been developed and will be discussed. Finally, Interface Crack Initiation and Growth in Composite Materials is viewed from the viewpoint of a coupled stress-energy failure criterion, and solved as a minimization problem developing appropriate algorithms and utilizing numerical methods such is the Boundary or the Finite Element Methods. Background theory, implementation of algorithms and applications considered will be discussed, while other subsidiary material occurred from the overall research activity will be briefly presented.

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