Analysis of Guided Wave Propagation in an Aluminium-CFRP Plate

Lugovtsova, Yevgeniya; BAM Bundesanstalt fur Materialforschung und -prufung; Germany

Lugovtsova, Y.; Federal Institute for Materials Research and Testing (BAM); Germany
Prager, J.; Federal Institute for Materials Research and Testing (BAM); Germany

ID: ECNDT-0090-2018
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Session: Guided Waves - Structural Health Monitoring
Room: G3
Date: 2018-06-15
Time: 10:50 - 11:10

Guided waves cover comparably long distances and thus allow for online structural health monitoring of safety relevant components, e.g. lightweight composite overwrapped pressure vessels (COPV) as used for the transportation of pressurised gases.
Reliable non-destructive assessment of COPVs’ condition is not available yet due to their complex composite structure comprising a thin metal liner and a fibre reinforced plastics (FRP) overwrap. The conventional overload hydrostatic pressure testing used for the metal vessels is not suitable for the composite vessels, because it may damage the FRP overwrap reducing the service life of the COPV. Therefore, ISO and CEN defined a maximum service life of composite pressure vessels as of 15 to 20 years. To extend the COPVs’ service life and to ensure a safer usage we are going to develop a structural health monitoring system based on guided ultrasonic waves.
In this contribution we present first results of guided waves propagation in a flat composite plate consisting of an aluminium layer firmly bonded to a carbon fibre reinforced plastic laminate. Based on experimental results we reconstruct material properties of FRP by means of the Scaled Boundary Finite Element Method (SBFEM).