Ryan Berke is an Assistant Professor of Mechanical and Aerospace Engineering at Utah State University. His research focus is in experimental solid mechanics, with an emphasis on extreme temperature environments. His lab uses advanced imaging techniques to study heterogeneous failure mechanisms such as fracture, fatigue, and creep. These measurements are performed at a variety of time, temperature, and length scales, with applications geared towards the energy, aerospace, and nuclear industries.
Jean-Noël Périé is a former student of the Ecole Normale Supérieure de Cachan. He passed the Agrégation (french professional teaching qualification) in 1994 and graduated in 1995. He obtained his PhD in 2000 from Ecole Normale Supérieure de Cachan under the supervision of Professor P. Ladevèze on the topic of "Damage meso-modelling of a 2.5D C/C composite". He passed his habilitation thesis to supervise PhDs on "Digital images and mechanics of composite materials and biological tissues". He is now Associate Professor at "Université Paul Sabatier". He teaches mainly in the mechanical engineering department of the "IUT 'A' Paul Sabatier", but he also gives master classes focused on "Photomechanics". He conducts his research at Clement Ader Institute. He is also the head of the team "Identification and Control of Thermic and Mechanical Properties" (5 researchers). His main interests are the experiment/simulation dialog and the identification of constitutive parameters. In particular, he developed identification techniques to retrieve constitutive parameters from full field measurements. He participated several times to CNRS summer school, and he has coauthored chapters in 3 books on this subject. He has also been involved in the development of several measurement techniques such as Digital Image Correlation (DIC), Digital Volume Correlation (DVC), Stereo Digital Image Correlation (SDIC), Multiscale DIC, etc. In addition, He has significant experience in the characterization of composite materials, and more generally in experimental mechanics.
Digitial image correlation (DIC) is a popular means for measuring
heterogeneous displacements and strains in deformable solids. Like most optical techniques, it is advantageous
because (i) it is non-contacting, and thus does not influence deformation; (ii) it records full-field data,
which is more robust compared to point-based or specimen-averaged techniques; and (iii) it can be performed
at any time or length scale, provided that proper cameras and lenses are used. This forum invites presenters
to discuss DIC-based work on materials at any time or length scale. Novel applications of DIC and/or applications
in challenging environments are especially welcome.
Modal displacements of a vibrating plate during resonance at high temperature, measured using stereo-DIC. Berke et al, "High Temperature Vibratory Response of Hastelloy-X: Stereo-DIC Measurements and Image Decomposition Analysis", Experimental Mechanics, 2016.