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In order to model theses phenomena, a generic ray tracing method based on the generalized Fermat’s principle has been developed and establishes the effective path of any ultrasonic propagating wave in a specimen of irregular surface, notably including the effective head wave path.
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Reference Number Reference Number. Characterization of guided wave propagation in aircraft structures Partenaire industriel: Article Abstract PDF 1.
VolumeNumberFebruary Fatigue damage, measurements and monitoring Part 2. Development of asymptotic models in ultrasonic non destructive techniques NDT: Test methodology for thickness measurement of soft material solidification front at high temperatures. Close Go to Workspace. Among the various NDT methods, ultrasonic techniques also provide a volumic inspection of the entire structure with a relatively easy implementation and is not binding in terms of safety and regulation.
Initial download of the metrics may take a while. The aim of this thesis is to ultraslns this ray model to account for specimen wedges diffraction. Data correspond to usage on the plateform after The head wave propagation along an irregular entry surface is shown by a numerical study to be not only a surface propagation phenomenon, as for the plane surface case, but also involves a bulk propagation phenomenon caused by diffractions of the ultrasonic wave field on the surface irregularities.
Demonstration of various ultrasound techniques for structural Health Monitoring pzr military aerospace structures Realizations: Monday, September 24, – Friday, December 30, – 3: Different defects were studied: Interaction between a crack and a network of cracks, near partial contact between the faces of the crack under the effect of stress … These phenomena may limit the capacity of sizing, or even detection of cracks.
Results obtained with this method are compared with those of the Sommerfeld method for this diffraction problem.
Publication Year Publication Year. Development of a knowledge base for inspection of aerospace structures using guided waves.
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Theoretical and experimental validations of the developed simulation tool have been carried out and have proven successful. Depending on the nature of the damage crack isolation or network defects, such as in the case of a thermal cracking, crack open or partially closed and the control technique used, more or less complex phenomena are involved: Standard Search Advanced Search.
Audrey Kamta Djakou 1 AuthorId: Design and integration of a SHM system for inspection of bonded composite joints Realizations: Alcan — Rio Tinto Financement: Les sujets de recherche incluent:. Advanced SHM technologies Partenaire industriel: The phenomena of thermal or mechanical fatigue of materials lead ultrzsons the alteration of structures, up to the creation of cracks.
The performance of ultraaons different techniques are evaluated experimentally and compared with simulations. The aim of nondestructive testing NDT is to detect these cracks and determine their size, required for determination of their harmfulness and damage to the structure. Have you forgotten your login? However, GTD diverges at observation directions close to incident and reflected shadow boundaries.
Development a methodology for coating estimation on complex composite parts. Cns permanent URL for this record. Ultrasonic thickness measurements of solidification front inside metallurgical reactor Partenaire industriel: In addition to its non-uniformity, another drawback of the GTD methodology ultrawons its restricted application to canonical geometries half-plane, wedge, … cns, as it mainly allows for the treatment of infinite edge diffraction.
Current usage metrics About article metrics Return to article. Touchscreen application based on guided wave reflection Partenaire industriel: Previous article Next article. Development a methodology for coating estimation on complex composite parts Realizations: Citation Audrey Kamta Djakou. Developpement de modeles asymptotiques en controle non destructif CND par ultrasons: Correlation-based imaging technique Partenaire industriel: These techniques rely on ultrasonic phased arrays probes, to master the direction and focus the ultrasound beam radiated in the component, so as to optimize the detection and sizing of defects.
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