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Masserey Bernard

Masserey Bernard

Professeur HES ordinaire/Responsable de la filière MSE

Main skills

Structural mechanics

Finite element modeling

Non destructive testing

Wave propagation in solids

Engineering curricula development

  • Contact

  • Teaching

  • Research

  • Publications

  • Conferences

  • Portfolio

Main contract

Professeur HES ordinaire/Responsable de la filière MSE

Phone: +41 26 429 66 58

Desktop: HEIA_D10.15

Haute école d'ingénierie et d'architecture de Fribourg
Boulevard de Pérolles 80, 1700 Fribourg, CH
HEIA-FR
Institute
SeSi - Sustainable Engineering Systems Institute

HES-SO Master
Av. de Provence 6, 1007 Lausanne, CH
SO Master
Faculty
Technique et IT
Main Degree Programme
Master of Science in Engineering

Responsable de la filière MSE

HES-SO Master
Av. de Provence 6, 1007 Lausanne, CH
SO Master
Faculty
Technique et IT
Main Degree Programme
Master of Science in Engineering
MSc HES-SO en Engineering - HES-SO Master
  • Advanced structural mechanics
BSc HES-SO en Génie mécanique - Haute école d'ingénierie et d'architecture de Fribourg
  • Résistance des matériaux
  • Dynamique des structures

Completed

Optimisation de la ligne de production PM12
AGP

Role: Collaborator

Requérant(e)s: FR - EIA - Institut SeSi

Financement: Eternit SA

Description du projet : Dans le cadre de l'amélioration de la productivité de la ligne de production PM12, ce premier mandat consiste à dresser une première cartographie du processus de la ligne PM12 et réaliser une analyse dynamique du flux de la partie découpage. Le but est de modéliser différents scénarios de modification de la chaine afin d'en étudier les avantages et inconvénients.

Research team within HES-SO: Riess Raymond , Masserey Bernard , Pasquier Richard

Partenaires académiques: FR - EIA - Institut SeSi

Durée du projet: 01.03.2016 - 31.08.2016

Montant global du projet: 6'700 CHF

Statut: Completed

Ultrasonic evaluation of monocrystalline silicon wafers for photovoltaic modules with a view to efficiency improvement
AGP

Role: Main Applicant

Financement: HES-SO Rectorat; Meyer Burger AG; FR - EIA - Institut ENERGY; FR - EIA - Institut ENERGY

Description du projet : In order to compete with traditional fossil energy, the photovoltaic industry is driven to make solar panels of the highest power conversion efficiency, with high reliability at the lowest possible production costs. The crystalline silicon wafers used for the solar cells are sliced down to thicknesses of 80 ' 200 'm. The sawing process leads to the generation of micro-cracks in the wafers. As the module ages and is subjected to thermal and mechanical loads, these micro-cracks can result in the loss of the wafer integrity and ultimate breakage of silicon wafers and cells, resulting in inactive cell parts and significant power loss. The main objective of this project is the optimisation and thus, the improvement of the photovoltaic module efficiency by evaluating the potential of an ultrasonic based method for the detection and quantification of the micro-cracks produced during the sawing process. The characterization of the wafers in terms of crack size and crack density will enable i) to optimize the slicing process in order to reduce micro-crack generation into a non-critical level, and ii) to identify and reject silicon wafers with a high risk of failure. The proposed methodology is based on the scattering of acoustic guided waves by discontinuities such as micro-cracks for quality evaluation of wafers with a view to efficiency improvement of crystalline silicon-based solar cells. The investigation of wave propagation and defect detectability will be complemented by numerical simulations.

Research team within HES-SO: Boéchat Jean-Marc , Robyr Jean-Luc , Banakh Oksana , Masserey Bernard

Partenaires académiques: Dispositifs médicaux

Durée du projet: 01.03.2012 - 30.09.2013

Montant global du projet: 148'500 CHF

Statut: Completed

2024

Developing 3D-printed wrist splints for distal radius and scaphoid fractures
Scientific paper ArODES

Bernadette Tobler-Ammann, Frédéric Schuind, Loïc Voillat, Théophile Gentilhomme, Esther Vögelin, Noé Murith, Bernard Masserey

Journal of Wrist Surgery,  2024

Link to the publication

Summary:

The purpose of this study is to optimize conservative treatment of distal radius and scaphoid fracture, in terms of comfort, fracture stabilization, and prevention of cast complications. Advances in additive manufacturing have allowed the development of patient-specific anatomical braces (PSABs) which have the potential to fulfill this purpose. Our specific aims were to develop a model of PSAB, adapted to fracture care, to evaluate if this brace would be well tolerated by healthy volunteers and to determine its mechanical properties as compared with conventional methods of wrist immobilization. Several three-dimensional-printed splint prototypes were designed by mechanical engineers based on surgeons' and hand therapists' clinical expertise. These experimental braces underwent testing in a preclinical study involving 10 healthy volunteers, assessing comfort, satisfaction, and activities. The final prototype was mechanically compared with a conventional cast and a prefabricated splint, testing different closing systems. A mathematical algorithm was created to automatically adapt the final PSAB model to the patient's anatomy. The final prototype achieved an overall satisfaction score of 79%, weighing less than 90 g, made from polyamide, and fixed using hook and loop straps. The PSAB stiffness varied between 0.64 and 0.99 Nm/degree, surpassing the performance of both conventional plaster casts and prefabricated splints. The final wrist PSAB model, adapted for fracture treatment, is lightweight, comfortable, and provides anatomical contention. It is currently being tested for the treatment of stable distal radius and scaphoid fractures in comparison to conventional plaster cast.

2022

Prozessüberwachung neu gedacht
Professional paper ArODES

Johannes Konrad, Bruno Bürgisser, Bernard Masserey, Yvan Jacquat

Kunstoffextra,  2022, no. 11-12, pp. 56-58

Link to the publication

Summary:

Das Institut iRAP der Hochschule für Technik und Architektur Freiburg arbeitet zusammen mit dem Unternehmen GradeSens AG an einer komplett neuen Herangehensweise, um mit Sensoren den kompletten Spritzgiessprozess zu überwachen. Der neue innovative Ansatz basiert auf Beschleunigungssensoren, welche an ein Spritzgiesswerkzeug angebracht werden.

2021

High-frequency guided wave propagation and scattering in silicon wafers
Scientific paper ArODES

Jean-Luc Robyr, Simon Mathieu, Bernard Masserey, Paul Fromme

Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems,  2021, vol. 4, no. 4, article no. 041007

Link to the publication

Summary:

Thin monocrystalline silicon wafers are employed for the manufacturing of solar cells with high conversion efficiency. Micro-cracks can be induced by the wafer cutting process, leading to breakage of the fragile wafers. High-frequency guided waves allow for the monitoring of wafers and detection and characterization of surface defects. The material anisotropy of the monocrystalline silicon leads to variations of the guided wave characteristics, depending on the guided wave mode and propagation direction relative to the crystal orientation. Selective excitation of the first antisymmetric A0 wave mode at 5 MHz center frequency was achieved experimentally using a custom-made wedge transducer. Strong wave pulses with limited beam skewing and widening were measured using noncontact laser interferometer measurements. This allowed the accurate characterization of the Lamb wave propagation and scattering at small artificial surface defects with a size of less than 100 µm. The surface extent of the defects of varying size was characterized using an optical microscope. The scattered guided wave field was evaluated, and characteristic parameters were extracted and correlated with the defect size, allowing in principle detection of small defects. Further investigations are required to explain the systematic asymmetry of the guided wave field in the vicinity of the indents.

High-frequency guided waves for corrosion thickness loss monitoring
Scientific paper ArODES

Daniel Chew, Bernard Masserey, Paul Fromme

Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems,  2021, vol. 4, no. 1, article no. 011007-1

Link to the publication

Summary:

Adverse environmental conditions result in corrosion during the life cycle of marine structures such as pipelines, offshore oil platforms, and ships. Generalized corrosion leading to the loss of wall thickness can cause the degradation of the integrity, strength, and load bearing capacity of the structure. Nondestructive detection and monitoring of corrosion damage in difficult to access areas can be achieved using high-frequency guided waves propagating along the structure. Using standard ultrasonic wedge transducers with single-sided access to the structure, specific high-frequency guided wave modes (overlap of both fundamental Lamb wave modes) were generated that penetrate through the complete thickness of the structure. The wave propagation and interference of the guided wave modes depend on the thickness of the structure and were measured using a noncontact laser interferometer. Numerical simulations using a two-dimensional finite element model were performed to visualize and predict the guided wave propagation and energy transfer across the plate thickness. During laboratory experiments, the wall thickness was reduced uniformly by milling of one steel plate specimen. In a second step, wall thickness reduction was induced using accelerated corrosion for two mild steel plates. The corrosion damage was monitored based on the effect on the wave propagation and interference (beating effect) of the Lamb wave modes in the frequency domain. Good agreement of the measured beatlengths with theoretical predictions was achieved, and the sensitivity of the methodology was ascertained, showing that high-frequency guided waves have the potential for corrosion damage monitoring at critical and difficult to access locations.

2018

Lamb wave propagation in monocrystalline silicon wafers
Scientific paper ArODES

Paul Fromme, Marco Pizzolato, Jean-Luc Robyr, Bernard Masserey

The Journal of the Acoustical Society of America,  2018, 143, 1, pp. 287-295

Link to the publication

Summary:

Monocrystalline silicon wafers are widely used in the photovoltaic industry for solar panels with high conversion efficiency. Guided ultrasonic waves offer the potential to efficiently detect microcracks in the thin wafers. Previous studies of ultrasonic wave propagation in silicon focused on effects of material anisotropy on bulk ultrasonic waves, but the dependence of the wave propagation characteristics on the material anisotropy is not well understood for Lamb waves. The phase slowness and beam skewing of the two fundamental Lamb wave modes A0 and S0 were investigated. Experimental measurements using contact wedge transducer excitation and laser measurement were conducted. Good agreement was found between the theoretically calculated angular dependency of the phase slowness and measurements for different propagation directions relative to the crystal orientation. Significant wave skew and beam widening was observed experimentally due to the anisotropy, especially for the S0 mode. Explicit finite element simulations were conducted to visualize and quantify the guided wave beam skew. Good agreement was found for the A0 mode, but a systematic discrepancy was observed for the S0 mode. These effects need to be considered for the non-destructive testing of wafers using guided waves.

2017

High frequency guided waves for disbond detection in multi-layered structures
Scientific paper ArODES

Paul Fromme, Jean-Pascal Reymondin, Bernard Masserey

Acta Acustica united with Acustica,  2017, vol. 103, pp. 932-940

Link to the publication

Summary:

Aerospace structures often contain multi-layered metallic components where hidden defects such as localized disbonds can develop, necessitating non-destructive testing. Model structures consisting of two adhesively bonded aluminium plates and artificial defects in the bond layer were manufactured. Immersion ultrasonic C- scans were used to check the uniformity of the bond layer and the manufactured defects. Employing standard wedge transducers, high frequency guided ultrasonic waves that penetrate through the complete specimen thickness were generated. Interference occurs between the wave modes during propagation along the structure, resulting in a frequency dependent variation of the energy through the thickness with distance. Significant propagation distance with a strong, non-dispersive main wave pulse was achieved. The interaction of the high frequency guided ultrasonic waves with small disbonds in the sealant layer and lack of sealant in the multilayer structure was investigated. Guided wave pulse-echo measurements were conducted to verify the detection sensitivity and the influence of the stand-off distance predicted from the finite element simulations. The results demonstrated the potential of high frequency guided waves for hidden defect detection at critical and difficult to access locations in aerospace structures from a stand-off distance.

The core layer is decisive :
Professional paper ArODES
influence of the wall thickness in fiber-reinforced plastic components

Didier Neuhaus, Bernard Masserey, Bruno Bürgisser

Kunststoffe International,  2017, vol. 107, no. 4, pp. 40-43

Link to the publication

Summary:

The mechanical properties of reinforced plastic components are not only influenced by the orientation of the fibers during the injection process but also by the wall thickness of the component. Rigidity deviations in a range up to 20% are ween with wall thicknesses of 1 to 4 mm. Comparing the results of numeric simulations and experimental tests sheds light on this issue.

Auf die Kernsicht kommt es an :
Professional paper ArODES
Einfluss der Wanddicke bei faserverstärtkten Kunststoffbauteilen

Didier Neuhaus, Bernard Masserey, Bruno Bürgisser

Kunststoffe International,  2017, vol. 107, no. 4, pp. 72-75

Link to the publication

Summary:

Die mechanischen Eigenschaften verstärkter Kunststoffteile werden nicht nur von der Orientierung der Fasern beim Einspritzvorgang beeinflusst, sondern auch von der Wanddicke des Bauteils. Bei Wanddicken von 1 bis 4 mm sind in der Steifigkeit Abweichungen in der Grössenordnung von bis zu 20 % feststellbar. Eine Gegenübber-stellung der Ergbenisse aus numerischen Simulationen und experimentellen Versuchen gibt Aufschluss.

2016

Analysis of high frequency guided wave scattering at a fastener hole with a view to fatigue crack detection
Scientific paper ArODES

Bernard Masserey, Paul Fromme

Ultrasonics,  2017, vol. 76, pp. 78-86

Link to the publication

Summary:

The scattering of high frequency guided ultrasonic waves by a fatigue crack at the side of a fastener hole has been studied. The guided wave pulse consists of the superposition of the two fundamental Lamb modes A0 and S0 above the cut-off frequencies of the higher modes. The scattered field was simulated using a three-dimensional finite difference algorithm with a staggered, Cartesian grid for the limited area of interest around the hole and an analytical phase angle correction for the additional, variable propagation distance. Experimentally, the modes were selectively excited using a standard ultrasonic wedge transducer and measured using a laser interferometer, resulting in good spatial resolution. The scattered field was measured and simulated for an undamaged hole, a small, part-thickness quarter-elliptical fatigue crack, and a through-thickness fatigue crack. Good agreement was found and a significant influence of the fatigue cracks on the scattered field was observed. The complex difference of the scattered field due to additional scattered waves at the fatigue cracks of variable depth and length was evaluated. This allows for the prediction of high frequency guided wave sensitivity for fatigue crack detection at fastener holes, a significant maintenance problem for ageing aircraft.

Life and death of plastics
Professional paper ArODES

Yvan Mongbanziama, Sandrine Aeby, Matthieu Kaehr, Vincent Pilloud, Jean-Luc Robyr, Bernard Masserey, Stefan Hengsberger, Samuel Roth, Pierre Brodard

CHIMIA International Journal for Chemistry,  2016, vol. 70, no. 9, pp. 649-650

Link to the publication

2015

In-situ monitoring of fatigue crack growth using high frequency guided waves
Scientific paper ArODES

Bernard Masserey, Paul Fromme

NDT E International,  2015, vol. 71, pp. 1-7

Link to the publication

Summary:

The development of fatigue cracks at fastener holes represents a common maintenance problem for aircraft. High frequency guided ultrasonic waves allow for the monitoring of critical areas without direct access to the defect location. During cyclic loading of tensile, aluminum specimens fatigue crack growth at the side of a fastener hole was monitored. The changes in the energy ratio of the baseline subtracted reflected guided wave signal due to the fatigue damage were monitored from a stand-off distance using standard ultrasonic pulse–echo measurement equipment. Good sensitivity for the detection and monitoring of fatigue crack growth was found.

High frequency guided ultrasonic waves for hidden fatigue crack growth monitoring in multi-layer model aerospace structures
Scientific paper ArODES

Henry Chan, Bernard Masserey, Paul Fromme

Smart Materials and Structures,  2015, vol. 24, no. 2, article no. 025037

Link to the publication

Summary:

Especially for ageing aircraft the development of fatigue cracks at fastener holes due to stress concentration and varying loading conditions constitutes a significant maintenance problem. High frequency guided waves offer a potential compromise between the capabilities of local bulk ultrasonic measurements with proven defect detection sensitivity and the large area coverage of lower frequency guided ultrasonic waves. High frequency guided waves have energy distributed through all layers of the specimen thickness, allowing in principle hidden (2nd layer) fatigue damage monitoring. For the integration into structural health monitoring systems the sensitivity for the detection of hidden fatigue damage in inaccessible locations of the multi-layered components from a stand-off distance has to be ascertained. The multi-layered model structure investigated consists of two aluminium plate-strips with an epoxy sealant layer. During cyclic loading fatigue crack growth at a fastener hole was monitored. Specific guided wave modes (combination of fundamental A0 and S0 Lamb modes) were selectively excited above the cut-off frequencies of higher modes using a standard ultrasonic wedge transducer. Non-contact laser measurements close to the defect were performed to qualify the influence of a fatigue crack in one aluminium layer on the guided wave scattering. Fatigue crack growth monitoring using laser interferometry showed good sensitivity and repeatability for the reliable detection of small, quarter-elliptical cracks. Standard ultrasonic pulse-echo equipment was employed to monitor hidden fatigue damage from a stand-off distance without access to the damaged specimen layer. Sufficient sensitivity for the detection of fatigue cracks located in the inaccessible aluminium layer was verified, allowing in principle practical in situ ultrasonic monitoring of fatigue crack growth.

2014

High-frequency guided ultrasonic waves for hidden defect detection in multi-layered aircraft structures
Scientific paper ArODES

Bernard Masserey, Christian Raemy, Paul Fromme

Ultrasonics,  2014, vol. 54, no. 7, pp. 1720-1728

Link to the publication

Summary:

Aerospace structures often contain multi-layered metallic components where hidden defects such as fatigue cracks and localized disbonds can develop, necessitating non-destructive testing. Employing standard wedge transducers, high frequency guided ultrasonic waves that penetrate through the complete thickness were generated in a model structure consisting of two adhesively bonded aluminium plates. Interference occurs between the wave modes during propagation along the structure, resulting in a frequency dependent variation of the energy through the thickness with distance. The wave propagation along the specimen was measured experimentally using a laser interferometer. Good agreement with theoretical predictions and two-dimensional finite element simulations was found. Significant propagation distance with a strong, non-dispersive main wave pulse was achieved. The interaction of the high frequency guided ultrasonic waves with small notches in the aluminium layer facing the sealant and on the bottom surface of the multilayer structure was investigated. Standard pulse-echo measurements were conducted to verify the detection sensitivity and the influence of the stand-off distance predicted from the finite element simulations. The results demonstrated the potential of high frequency guided waves for hidden defect detection at critical and difficult to access locations in aerospace structures from a stand-off distance.

2013

Fatigue crack growth monitoring using high-frequency guided waves
Scientific paper ArODES

Bernard Masserey

Structural Health Monitoring,  12, 5-6, 484-493

Link to the publication

Summary:

A common problem in aircraft maintenance is the development of fatigue cracks at fastener holes due to stress concentration. High-frequency guided ultrasonic waves allow for the structural health monitoring of critical areas of a structure and can be measured with high accuracy using a noncontact laser interferometer. The use of a specific type of high-frequency guided ultrasonic wave that has good sensitivity for the detection of small defects, excited using a standard Rayleigh wedge transducer and propagating along the structure, has been investigated. Fatigue crack growth at the side of a fastener hole in a tensile, aluminum specimen was induced by cyclic loading of the structure. The crack length was monitored optically and showed good correlation with fracture mechanics calculations of the expected growth rate. The changes in the guided wave signal due to the fatigue damage were monitored using a noncontact laser interferometer and quantified. The measurements show a good sensitivity for the early detection of fatigue damage and for the monitoring of fatigue crack growth at a fastener hole. The propagation and scattering of the high-frequency guided ultrasonic wave has been simulated numerically using a three-dimensional finite difference code. Good agreement was found between the measured and predicted changes of the ultrasonic signal for the increasing fatigue crack area, allowing in principle for the approximate sizing of the defect.

2018

Guided ultrasonic wave beam skew in silicon wafers
Conference ArODES

Marco Pizzolato, Bernard Masserey, Jean-Luc Robyr, Paul Fromme

Proceedings of 44th annual review of progress in quantitative nondestructive evaluation, vol. 37, Provo, Utah, USA, 16-21 July 2017

Link to the conference

Silicon wafer defect detection using high frequency guided waves
Conference ArODES

Michael Lauper, Paul Fromme, Jean-Luc Robyr, Bernard Masserey

Proceedings of SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: Health Monitoring of Structural and Biological Systems XII, Denver, Colorado, United States, 4-8 March 2018

Link to the conference

Summary:

In the photovoltaic industry monocrystalline silicon wafers are employed for the manufacture of solar panels with high conversion efficiency. The cutting process induces micro-cracks on the thin wafer surface. High frequency guided ultrasonic waves are considered for the structural monitoring of the wafers and the nondestructive characterization of the micro-cracks. The material anisotropy of the monocrystalline silicon leads to variations of the wave characteristics depending on the propagation direction relative to the crystal orientation. In non-principal directions of the crystal, wave beam skewing occurs. Selective excitation of the fundamental Lamb wave modes was achieved using a custom-made angle beam transducer and holder to achieve a controlled contact pressure. The out-of-plane component of the guided wave propagation was measured using a noncontact laser interferometer. Artificial defects were introduced in the wafers using a micro indenter with varying loads. The defects were characterized from microscopy images to measure the indent size and combined crack length. The scattering of the A0 Lamb wave mode was measured experimentally and the characteristics of the scattered wave field were correlated to the defect size. The detection sensitivity is discussed.

2017

High frequency guided wave propagation in monocrystalline silicon wafers
Conference ArODES

Marco Pizzolato, Bernard Masserey, Jean-Luc Robyr, Paul Fromme

Health Monitoring of Structural and Biological Systems 2017 ; SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 25-29 March 2017, Portland, Oregon, United States

Link to the conference

Summary:

Monocrystalline silicon wafers are widely used in the photovoltaic industry for solar panels with high conversion efficiency. The cutting process can introduce micro-cracks in the thin wafers and lead to varying thickness. High frequency guided ultrasonic waves are considered for the structural monitoring of the wafers. The anisotropy of the monocrystalline silicon leads to variations of the wave characteristics, depending on the propagation direction relative to the crystal orientation. Full three-dimensional Finite Element simulations of the guided wave propagation were conducted to visualize and quantify these effects for a line source. The phase velocity (slowness) and skew angle of the two fundamental Lamb wave modes (first anti-symmetric mode A0 and first symmetric mode S0) for varying propagation directions relative to the crystal orientation were measured experimentally. Selective mode excitation was achieved using a contact piezoelectric transducer with a custom-made wedge and holder to achieve a controlled contact pressure. The out-of-plane component of the guided wave propagation was measured using a noncontact laser interferometer. Good agreement was found with the simulation results and theoretical predictions based on nominal material properties of the silicon wafer.

High-frequency guided ultrasonic waves to monitor corrosion thickness loss
Conference ArODES

Paul Fromme, Fabian Bernhard, Bernard Masserey

Proceedings of the 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), 17-22 July 2016, Atlanta, GA, USA ; AIP Conference Proceedings

Link to the conference

Summary:

Corrosion due to adverse environmental conditions can occur for a range of industrial structures, e.g., ships and offshore oil platforms. Pitting corrosion and generalized corrosion can lead to the reduction of the strength and thus degradation of the structural integrity. The nondestructive detection and monitoring of corrosion damage in difficult to access areas can be achieved using high frequency guided ultrasonic waves propagating along the structure. Using standard ultrasonic transducers with single sided access to the structure, the two fundamental Lamb wave modes were selectively generated simultaneously, penetrating through the complete thickness of the structure. The wave propagation and interference of the guided wave modes depends on the thickness of the structure. Numerical simulations were performed using a 2D Finite Difference Method (FDM) algorithm in order to visualize the guided wave propagation and energy transfer across the plate thickness. Laboratory experiments were conducted and the wall thickness reduced initially uniformly by milling of the steel structure. Further measurements were conducted using accelerated corrosion in salt water. From the measured signal change due to the wave mode interference, the wall thickness reduction was monitored and good agreement with theoretical predictions was achieved. Corrosion can lead to non-uniform thickness reduction and the influence of this on the propagation of the high frequency guided ultrasonic waves was investigated. The wave propagation in a steel specimen with varying thickness was measured experimentally and the influence on the wave propagation characteristics quantified.

2014

Noncontact monitoring of fatigue crack growth using high frequency guided waves
Conference ArODES

Bernard Masserey, Paul Fromme

Proceedings of SPIE Smart Structures and Materials + Nondestructive evaluation and Health Monitoring, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2014, 9-13 March 2014, San Diego, CA, USA

Link to the conference

Summary:

The development of fatigue cracks at fastener holes due to stress concentration is a common problem in aircraft maintenance. This contribution investigates the use of high frequency guided waves for the non-contact monitoring of fatigue crack growth in tensile, aluminium specimens. High frequency guided ultrasonic waves have a good sensitivity for defect detection and can propagate along the structure, thus having the potential for the inspection of difficult to access parts by means of non-contact measurements. Experimentally the required guided wave modes are excited using standard wedge transducers and measured using a laser interferometer. The growth of fatigue cracks during cyclic loading was monitored optically and the resulting changes in the signal caused by crack growth are quantified. Full three-dimensional simulation of the scattering of the high frequency guided ultrasonic waves at the fastener hole and crack has been implemented using the Finite Difference (FD) method. The comparison of the results shows a good agreement of the measured and predicted scattered field of the guided wave at quarter-elliptical and through-thickness fatigue cracks. The measurements show a good sensitivity for the early detection of fatigue damage and for the monitoring of fatigue crack growth at a fastener hole. The sensitivity and repeatability are ascertained, and the robustness of the methodology for practical in-situ ultrasonic monitoring of fatigue crack growth is discussed.

Achievements

2019

CTI International Expert

 2019 ; Quality Management in Education

Collaborateurs: Masserey Bernard

Link to the achievement

As international expert, I participate in the evaluation of engineering programmes offered by French higher education institutions, that leads to the accreditation of the institutions to award the engineering degree.

2018

AEQES Expert

 2018 ; Quality Management in Education

Collaborateurs: Masserey Bernard

Link to the achievement

Expert pair pour l'évaluation du cursus Electricité et mécanique en 2018-2019 pour l'Agence pour l'Evaluation de la Qualité de l'Enseignement Supérieur (AEQES), Belgique.

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