Funded by the European Union
WP 1 Structural Health Monitoring
Development of practical techniques for increasing the sensitivity of structural response to damages
Development of damage identification techniques for skeletal structures
(e.g. a railway bridge), including a technique for modeling of
semi-rigid joints in frame structures and identification of their
defects. In practice, joint defects are the most often occurring
defects in bridge-like structures.
- by adding properly placed virtual masses
- by extracting local-only information from global response (virtual supports and virtual isolation of substructures)
Nonparametric monitoring of structures: development of
techniques for nonparametric monitoring of structures (directly based
on experimentally measured data instead of a FE model).
Access to Adaptronica's railway bridge monitoring system in
Nieporęt allowed the IPPT team to get acquainted with the practical
in-field requirements for their SHM methods.
Defect monitoring in piping systems
Modeling and monitoring of prestressed fibre composites: Development
and numerical verification of a prestress model for fibre composites.
Preparations for experimental verification (including mastering a
technique for introducing prestress, fabrication of a prestressed
composite, performing static loading experimental tests, and ongoing
development of techniques for monitoring of relaxation process) are
underway. This has set the scene for the following steps: studying the
relaxation process in the validated numerical model, studying the
damage mechanisms on prestressed composites, and characterization of
their damages using acoustical techniques through simulation. The
ultimate goal is the development of an acoustical technique for
monitoring of prestress relaxation.
- Development of an SHM technique based on guided torsional waves for piping systems
and numerical verification of a technique for virtual isolation of half
pipes through identification of reaction forces of virtual supports.
The technique allows for selective automatic focusing the monitoring
systems on half pipes by sorting out the echos from the other part of
the pipe. Tests of the applicability of existing transducers for the
purpose of virtual isolation.
Investigations into structural health monitoring of large CFRP
composite plates using Lamb waves excited by piezoelectric patches
(PWAS). In this phase, analytical and numerical studies on Lamb waves
for both isotropic and anisotropic materials have been made and as
result initial phase numerical FEM model has been developed for
generation and reception of Lamb waves using COMSOL- multiphysics. The
study focused on problems due to dispersion, attenuation and anisotropy
when Lamb waves interact with defects in the composite materials. The
next phase is to validate the developed mathematical model by
conducting experiment on the composite plate by embedding PWAS patches.
Finally, the acquired data from the experiment will be useful to
perform image reconstruction.
Studies in long-range structural health monitoring using
surface and structural waves via the wave finite element method (WFEM)
and inhomogenous wave correlation method (IWC). A numerical study of
damage detection in a stiffened panel using guided waves and IWC at low
and medium frequencies.