HEDAN Stephen

Stephen Hedan

Contact me

Engineering School of Poitiers – ENSIP
University of Poitiers
Building B1
1 rue Marcel Doré
86022 Poitiers Cedex _
France

or

UMR CNRS 7285 IC2MP
SFA – University of Poitiers
Building B35
Albert Street Turpain
86022 Poitiers Cedex _
France

Tel: +33. (0) 5.49 45 35 48
Fax: +33 (0) 5 49 45 36 34
Stephen.hedan[at]univ-poitiers.fr

Research topics

– The originality of my research is the use of experimental approaches non-invasive, non-destructive quantification of kinematic fields in the clay matrix (sedimentary rocks, soils, geomaterials) under mechanical stress, heat or water.

– These optical methods provide access to (i) 2D or 3D characterization of the behavior of fine medium analyzed which supports the formulation of laws of behavior and / or validation of theoretical models and numerical (ii) the location of areas highly heterogeneous, reflecting the presence of geometrical discontinuities (cracks) in the massif.

– These measures therefore apply to many issues related to (a) the environment (nuclear waste storage, recovery of geo-materials), (b) the mechanical behavior of clays (eg withdrawal / swelling).

– My research is positioned at the interface of two domains:

  • Mineralogy / petrology to characterize the clay medium (laboratory proficiency Hydrasa);
  • Mechanics (mechanical quantities, laws of behavior …).

Valorisation and dissemination of research

– Member of the organizing committee of the 14th International Conference on Experimental Mechanics, 4-9 July 2010, Poitiers (France).

Illustrative selection of five recent publications

2010
Hedan, S., Valle, V., Cottron, M. “In Plane Displacement Formulation for Finite Cracked Plates Under Mode I Using Grid Method and Finite Element Analysis”, Experimental Mechanics, 50 (3), pp. 401-412.

2009
Barranger, Y., Doumalin, P., Dupre, JC., Germaneau, A., Hedan, S., Valle, V. “Evaluation of three-dimensional and two-dimensional displacement fields full of a single edge notch fracture mechanics specimen, in light of experimental data using x-ray tomography.” Engineering Fracture Mechanics, 76 (15) :2371-2383, (2009).

2008
Hedan, S., Pop O., Valle, V., Cottron, M. “FE and experimental investigation with shadow optical method for measuring area in a ductile plastic cracked plate”, Strain, Accepted December2008, forthcoming.

2007
Hedan, S., Valle, V., Cottron, M. “Locating experimental 3D effects and transient crack tip for different speeds of propagation of brittle materials”, CR Mécanique, 335 (4), pp 238-244 .

2006
Hedan, S., Pop O., Valle, V., Cottron, M. “Dynamic optical interferometry Applied to analysis out-of-plane displacement fields for crack propagation in brittle materials”, Journal de Physique IV, 134, pp. 597 – 601.

Recherche

Menu principal

Haut de page