https://sam.ensam.eu:443 The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. Sun, 14 Jun 2026 10:47:35 GMT 2026-06-14T10:47:35Z http://hdl.handle.net/10985/8261 Three dimensional image correlation from X-Ray computed tomography of solid foam ROUX, Stéphane; HILD, François; BERNARD, Dominique; VIOT, Philippe A new methodology is proposed to estimate 3D displacement fields from pairs of images obtained from X-Ray Computed Micro Tomography (XCMT). Contrary to local approaches, a global approach is followed herein that evaluates continuous displacement fields. Although any displacement basis could be considered, the procedure is specialized to finite element shape functions. The method is illustrated with the analysis of a compression test on a polypropylene solid foam (independently studied in a companion paper). A good stability of the measured displacement field is obtained for cubic element sizes ranging from 16 voxels to 6 voxels. This work is part of a project (PHOTOFIT) funded by the Agence Nationale de la Recherche. We acknowledge the European Synchrotron Radiation Facility for provision of synchrotron radiation facilities and we would like to thank Joanna Hoszowska for assistance in using beamline BM05. Mon, 01 Jan 2007 00:00:00 GMT http://hdl.handle.net/10985/8261 2007-01-01T00:00:00Z ROUX, Stéphane HILD, François BERNARD, Dominique VIOT, Philippe A new methodology is proposed to estimate 3D displacement fields from pairs of images obtained from X-Ray Computed Micro Tomography (XCMT). Contrary to local approaches, a global approach is followed herein that evaluates continuous displacement fields. Although any displacement basis could be considered, the procedure is specialized to finite element shape functions. The method is illustrated with the analysis of a compression test on a polypropylene solid foam (independently studied in a companion paper). A good stability of the measured displacement field is obtained for cubic element sizes ranging from 16 voxels to 6 voxels. http://hdl.handle.net/10985/11115 Cutting force sensor based on digital image correlation for segmented chip formation analysis BAIZEAU, Thomas; CAMPOCASSO, Sébastien; ROSSI, FREDERIC; POULACHON, Gerard; HILD, François Conventional piezoelectric sensors cannot record the force fluctuations at high frequencies to monitor serrated chip formation. Recently, force measurements by using digital image correlation (DIC) have been reported thanks to imaging devices that become more and more efficient, thereby opening possibilities of high rate acquisition. This study proposes to apply DIC based on closed-form solutions in order to measure cutting forces at camera acquisition frequency. The considered displacement fields are obtained from the Flamant–Boussinesq solution. This method is first applied to picture pairs shot during the cut and then to a full sequence of pictures recorded upon orthogonal cutting of hardened AISI 52100 steel with a c-BN tool. To validate part of the corresponding mechanism, the change of cutting forces is finally investigated when chip segments are formed. Fri, 01 Jan 2016 00:00:00 GMT http://hdl.handle.net/10985/11115 2016-01-01T00:00:00Z BAIZEAU, Thomas CAMPOCASSO, Sébastien ROSSI, FREDERIC POULACHON, Gerard HILD, François Conventional piezoelectric sensors cannot record the force fluctuations at high frequencies to monitor serrated chip formation. Recently, force measurements by using digital image correlation (DIC) have been reported thanks to imaging devices that become more and more efficient, thereby opening possibilities of high rate acquisition. This study proposes to apply DIC based on closed-form solutions in order to measure cutting forces at camera acquisition frequency. The considered displacement fields are obtained from the Flamant–Boussinesq solution. This method is first applied to picture pairs shot during the cut and then to a full sequence of pictures recorded upon orthogonal cutting of hardened AISI 52100 steel with a c-BN tool. To validate part of the corresponding mechanism, the change of cutting forces is finally investigated when chip segments are formed. http://hdl.handle.net/10985/19446 Advances in pantographic structures: design, manufacturing, models, experiments and image analyses DELL’ISOLA, Francesco; SEPPECHER, Pierre; SPAGNUOLO, Mario; BARCHIESI, Emilio; HILD, François; LEKSZYCKI, Tomasz; GIORGIO, Ivan; PLACIDI, Luca; ANDREAUS, Ugo; CUOMO, Massimo; EUGSTER, Simon R.; PFAFF, Aron; HOSCHKE, Klaus; LANGKEMPER, Ralph; TURCO, Emilio; SARIKAYA, Rizacan; MISRA, Aviral; DE ANGELO, Michele; D’ANNIBALE, Francesco; BOUTERF, Amine; PINELLI, Xavier; MISRA, Anil; DESMORAT, Boris; PAWLIKOWSKI, Marek; DUPUY, Corinne; SCERRATO, Daria; PEYRE, Patrice; LAUDATO, Marco; MANZARI, Luca; GÖRANSSON, Peter; HESCH, Christian; HESCH, Sofia; FRANCIOSI, Patrick; DIRRENBERGER, Justin; MAURIN, Florian; VANGELATOS, Zacharias; GRIGOROPOULOS, Costas; MELISSINAKI, Vasileia; FARSARI, Maria; MULLER, Wolfgang; ABALI, Bilen Emek; LIEBOLD, Christian; GANZOSCH, Gregor; HARRISON, Philip; DROBNICKI, Rafał; IGUMNOV, Leonid; ALZAHRANI, Faris; HAYAT, Tasawar In the last decade, the exotic properties of pantographic metamaterials have been investigated and different mathematical models (both discrete or continuous) have been introduced. In a previous publication, a large part of the already existing literature about pantographic metamaterials has been presented. In this paper, we give some details about the next generation of research in this field. We present an organic scheme of the whole process of design, fabrication, experiments, models and image analyses. Tue, 01 Jan 2019 00:00:00 GMT http://hdl.handle.net/10985/19446 2019-01-01T00:00:00Z DELL’ISOLA, Francesco SEPPECHER, Pierre SPAGNUOLO, Mario BARCHIESI, Emilio HILD, François LEKSZYCKI, Tomasz GIORGIO, Ivan PLACIDI, Luca ANDREAUS, Ugo CUOMO, Massimo EUGSTER, Simon R. PFAFF, Aron HOSCHKE, Klaus LANGKEMPER, Ralph TURCO, Emilio SARIKAYA, Rizacan MISRA, Aviral DE ANGELO, Michele D’ANNIBALE, Francesco BOUTERF, Amine PINELLI, Xavier MISRA, Anil DESMORAT, Boris PAWLIKOWSKI, Marek DUPUY, Corinne SCERRATO, Daria PEYRE, Patrice LAUDATO, Marco MANZARI, Luca GÖRANSSON, Peter HESCH, Christian HESCH, Sofia FRANCIOSI, Patrick DIRRENBERGER, Justin MAURIN, Florian VANGELATOS, Zacharias GRIGOROPOULOS, Costas MELISSINAKI, Vasileia FARSARI, Maria MULLER, Wolfgang ABALI, Bilen Emek LIEBOLD, Christian GANZOSCH, Gregor HARRISON, Philip DROBNICKI, Rafał IGUMNOV, Leonid ALZAHRANI, Faris HAYAT, Tasawar In the last decade, the exotic properties of pantographic metamaterials have been investigated and different mathematical models (both discrete or continuous) have been introduced. In a previous publication, a large part of the already existing literature about pantographic metamaterials has been presented. In this paper, we give some details about the next generation of research in this field. We present an organic scheme of the whole process of design, fabrication, experiments, models and image analyses. http://hdl.handle.net/10985/6521 Volume changes in a filled elastomer studied via digital image correlation DE CREVOISIER, Jordan; BESNARD, Gilles; MERCKEL, Yannick; ZHANG, Huan; CAILLARD, Julien; VION-LOISEL, Fabien; BERGHEZAN, Daniel; CRETON, Costantino; DIANI, Julie; BRIEU, Mathias; HILD, François; ROUX, Stéphane Volumetric strains in a filled SBR specimen subjected to cyclic uniaxial tension with increasing extensions are studied. Digital image correlation is used to follow the kinematics of two orthogonal free faces. A volume expansion is observed past a critical elongation, which can be interpreted as the onset of cavitation. Under unloading, the volume returns to its original value and remains constant upon reloading. Increasing the elongation to higher values than the previous cycle leads again to a volumetric expansion. Sun, 01 Jan 2012 00:00:00 GMT http://hdl.handle.net/10985/6521 2012-01-01T00:00:00Z DE CREVOISIER, Jordan BESNARD, Gilles MERCKEL, Yannick ZHANG, Huan CAILLARD, Julien VION-LOISEL, Fabien BERGHEZAN, Daniel CRETON, Costantino DIANI, Julie BRIEU, Mathias HILD, François ROUX, Stéphane Volumetric strains in a filled SBR specimen subjected to cyclic uniaxial tension with increasing extensions are studied. Digital image correlation is used to follow the kinematics of two orthogonal free faces. A volume expansion is observed past a critical elongation, which can be interpreted as the onset of cavitation. Under unloading, the volume returns to its original value and remains constant upon reloading. Increasing the elongation to higher values than the previous cycle leads again to a volumetric expansion. http://hdl.handle.net/10985/7334 A space–time approach in digital image correlation: Movie-DIC BESNARD, Gilles; ROUX, Stéphane; HILD, François; GUÉRARD, Sandra A new method is proposed to estimate arbitrary velocity fields from a time series of images acquired by a single camera. This approach, here focused on a single spatial plus a time dimension, is specialized to the decomposition of the velocity field over rectangular shaped (finite-element) bilinear shape functions. It is therefore assumed that the velocity field is essentially aligned along one direction. The use of a time sequence over which the velocity is assumed to have a smooth temporal change allows one to use elements whose spatial extension is much smaller than in traditional digital image correlation based on successive image pairs. This method is first qualified by using synthetic numerical test cases, and then applied to a dynamic tensile test performed on a tantalum specimen. Improvements with respect to classical digital image correlation techniques are observed in terms of spatial resolution. Sat, 01 Jan 2011 00:00:00 GMT http://hdl.handle.net/10985/7334 2011-01-01T00:00:00Z BESNARD, Gilles ROUX, Stéphane HILD, François GUÉRARD, Sandra A new method is proposed to estimate arbitrary velocity fields from a time series of images acquired by a single camera. This approach, here focused on a single spatial plus a time dimension, is specialized to the decomposition of the velocity field over rectangular shaped (finite-element) bilinear shape functions. It is therefore assumed that the velocity field is essentially aligned along one direction. The use of a time sequence over which the velocity is assumed to have a smooth temporal change allows one to use elements whose spatial extension is much smaller than in traditional digital image correlation based on successive image pairs. This method is first qualified by using synthetic numerical test cases, and then applied to a dynamic tensile test performed on a tantalum specimen. Improvements with respect to classical digital image correlation techniques are observed in terms of spatial resolution. http://hdl.handle.net/10985/7387 3D analysis from micro-MRI during in situ compression on cancellous bone. BENOIT, Aurélie; GILLET, Brigitte; GUILLOT, Geneviève; HILD, François; MITTON, David; PERIE, Jean Noël; ROUX, Stéphane; GUÉRARD, Sandra A mini-compression jig was built to perform in situ tests on bovine trabecular bone monitored by micro-MRI. The MRI antenna provided an isotropic resolution of 78 microm that allows for a volume correlation method to be used. Three-dimensional displacement fields are then evaluated within the bone sample during the compression test. The performances of the correlation method are evaluated and discussed to validate the technique on trabecular bone. By considering correlation residuals and estimates of acquisition noise, the measured results are shown to be trustworthy. By analyzing average strain levels for different interrogation volumes along the loading direction, it is shown that the sample size is less than that of a representative volume element. This study shows the feasibility of the 3D-displacement and strain field analyses from micro-MRI images. Other biological tissues could be considered in future work. The authors would like to acknowledge Claude Verliac and Joachim Magnier for technical advice on the manufacturing process of the mechanical loading system. Thu, 01 Jan 2009 00:00:00 GMT http://hdl.handle.net/10985/7387 2009-01-01T00:00:00Z BENOIT, Aurélie GILLET, Brigitte GUILLOT, Geneviève HILD, François MITTON, David PERIE, Jean Noël ROUX, Stéphane GUÉRARD, Sandra A mini-compression jig was built to perform in situ tests on bovine trabecular bone monitored by micro-MRI. The MRI antenna provided an isotropic resolution of 78 microm that allows for a volume correlation method to be used. Three-dimensional displacement fields are then evaluated within the bone sample during the compression test. The performances of the correlation method are evaluated and discussed to validate the technique on trabecular bone. By considering correlation residuals and estimates of acquisition noise, the measured results are shown to be trustworthy. By analyzing average strain levels for different interrogation volumes along the loading direction, it is shown that the sample size is less than that of a representative volume element. This study shows the feasibility of the 3D-displacement and strain field analyses from micro-MRI images. Other biological tissues could be considered in future work.