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this framework, Eddy Current Testing (ECT) of composite materials is of importance in many domains of industry:
energy production (nuclear plants), transportation (aeronautic), workpiece manufacturing, and so forth.
This technique, based on the investigation of magnetic flux of exciting coils placed close to the specimen under
analysis, is used to detect and characterize possible flaws or anomalies in specimens.
In contrary to the traditional targets of the ECT investigations, the carbon fibre reinforced plastic materials
(CFRPs) has non isotropic and non continuous but patterned spatial distribution of the conductivity due to the
composite structure. Therefore, the study as well as the modelling of the interaction between the composite
materials and the electromagnetic field requires novel approach.
The method of approach depends on the objectives of the investigation. Typical testing configurations may consist
of ferrite core coil probes, placed above a planar (or at least locally planar) composite specimen and operating
at frequency depending on the problem (typically between a few Hz to a few MHz). The aim of ferrite
core is to focus the magnetic flux into the certain area of the specimen, in order to increase the probe sensitivity
to the defect. For each application, the coil model, as well as, the operating frequencies are set according to
the task. This paper proposes an application of a novel electromagnetic computational method for the problem
of ferrite core based ECT probe can be used for inspecting of composite materials.
For our purpose a Finite Element Method (FEM) based software has been exploited in order to optimise the
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sensor effect and the drop-in suppression, the operating parameters of the frequency and field strength and for
geometrical and physical modeling. In order to simulate the response of a probe to the presence of defects, it
is necessary to study how a probe excites the specimen to be tested, considering its electrical anisotropy. Usually,
the goal is the optimisation of probe and the assessment of such perturbation as lift-off and tilting.
In the investigated situation, the probe is placed above and parallel to a composite block. It is made of a Eprofiled
ferrite core, excited by a coaxial coil. We verify the distortion of EC’s flux lines caused by the presence
of defect and the magnetic field’s density. In our FEM, since we use A-ψ formulation, just the z-component of
magnetic potential A is non null. This paper presents the details and numerical results of our study.
Title: Mobile Measuring and Documentation of Visual Impression and Surface Topography
Authors: Dr P. Weinhold, Dr T. Schüßler
Innowep GmbH
Time: November 3, 2009 5:40 pm
Room: Lumen
So far, the visual impression and the micro topography of a lacquer surface could only be measured with highly
sophisticated scientific instruments used in laboratories, such as auto-focus testing devices for topography.
To achieve this, samples had to be removed from the aeroplane for laboratory measurements. Furthermore, up
to now there are no mobile methods or devices available. Methods and devices are needed that generate key
figures in order to quantify results in an objective and reproducible way. The technology has to be capable
of determining the visual impression and surface topography at the same time. The measured data must be
processed in a suitable way to assess the performance of the lacquer coating.
A new mobile measuring technology for documentation of the visual impression of a surface and its topography
has been developed and validated. The topography as well as the visual impression is measured by a
mobile unit under reproducible conditions. The data is recorded, stored and evaluated by a documentation
and analysis software. Thus it is possible to measure the quality of the lacquer surface of an aeroplane wing
directly on the plane without the need to remove the parts.
SESSION A2B SIMULATION FORUM
Chair: Mr Yvan Radovcic (Samtech)
Title: Simulation Driven Product Development with ANSYS Workbench
Authors: Dr M. Hortmann
Time: November 3, 2009 4:00 pm
Room: Candela
Title: Enhancing the Composites Design-to-Manufacturing Process with FiberSIM(R) 2009
Authors: S. Peck
VISTAGY, Inc.
Time: November 3, 2009 4:20 pm
Room: Candela
The FiberSIM(R) CEE (Composite Engineering Environment) software is fully integrated into all major CAD
systems and is based on VISTAGY‘s EnCapta technology that allows the storage of specific-engineering data
(at the feature level) right within the CAD part. In this demo of FiberSIM, you will see how the software helps
companies clearly identify and mitigate risks associated with the design and manufacture of composite parts
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